Rosetta Code

Generate lower case ASCII alphabet

Generate an array, list, lazy sequence, or even an indexable string of all the lower case ASCII characters, from a to z. If the standard library contains such a sequence, show how to access it, but don't fail to show how to generate a similar sequence.

Task
Generate lower case ASCII alphabet
You are encouraged to solve this task according to the task description, using any language you may know.
Task

For this basic task use a reliable style of coding, a style fit for a very large program, and use strong typing if available. It's bug prone to enumerate all the lowercase characters manually in the code.

During code review it's not immediate obvious to spot the bug in a Tcl line like this contained in a page of code: 

set alpha {a b c d e f g h i j k m n o p q r s t u v w x y z}


Other tasks related to string operations:
Metrics
Counting
Remove/replace
Anagrams/Derangements/shuffling
Find/Search/Determine
Formatting
Song lyrics/poems/Mad Libs/phrases
Tokenize
Sequences



0815

This creates the list in the queue 

<:61:~}:000:>>&{~<:7a:-#:001:<:1:+^:000:

11l 

print(Array(‘a’..‘z’))
Output:
[a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z]

360 Assembly

In EBCDIC coding there are more than 24 characters between a and z. So we have to get rid of characters between i and j and also between r and s. 

*        Generate lower case alphabet - 15/10/2015
LOWER    CSECT
         USING  LOWER,R15          set base register
         LA     R7,PG              pgi=@pg
         SR     R6,R6              clear 
         IC     R6,=C'a'           char='a'
         BCTR   R6,0               char=char-1
LOOP     LA     R6,1(R6)           char=char+1
         STC    R6,CHAR
         CLI    CHAR,C'i'          if char>'i'
         BNH    OK
         CLI    CHAR,C'j'          and char<'j'
         BL     SKIP               then skip
         CLI    CHAR,C'r'          if char>'r'
         BNH    OK
         CLI    CHAR,C's'          and char<'s'
         BL     SKIP               then skip
OK       MVC    0(1,R7),CHAR       output char
         LA     R7,1(R7)           pgi=pgi+1
SKIP     CLI    CHAR,C'z'          if char='z'
         BNE    LOOP               loop
         XPRNT  PG,26              print buffer
         XR     R15,R15            set return code
         BR     R14                return to caller
CHAR     DS     C                  character
PG       DS     CL26               buffer
         YREGS
         END    LOWER
Output:
abcdefghijklmnopqrstuvwxyz

6502 Assembly

Stores the lower-case ASCII alphabet as a null-terminated string beginning at address 2000 hex. Register contents are preserved. 

ASCLOW: PHA             ; push contents of registers that we
        TXA             ; shall be using onto the stack
        PHA
        LDA   #$61      ; ASCII "a"
        LDX   #$00
ALLOOP: STA   $2000,X
        INX
        CLC
        ADC   #$01
        CMP   #$7B      ; have we got beyond ASCII "z"?
        BNE   ALLOOP
        LDA   #$00      ; terminate the string with ASCII NUL
        STA   $2000,X
        PLA             ; retrieve register contents from
        TAX             ; the stack
        PLA
        RTS             ; return

68000 Assembly

Translation of: 6502 Assembly

Stores the lower-case ASCII alphabet as a null-terminated string beginning at address 100000 hex. Register contents are preserved.

Called as a subroutine (i.e. "JSR Ascii_Low" if far away or "BSR Ascii_Low" if nearby) 

Ascii_Low:
MOVEM.L D0/A0,-(SP)	;store D0 and A0 on stack

LEA $00100000,A0	;could also have used MOVE.L since the address is static
MOVE.B #$61,D0		;ascii "a"

loop_AsciiLow:
MOVE.B D0,(A0)+		;store letter in address and increment pointer by 1
ADDQ.B #1,D0		;add 1 to D0 to get the next letter
CMP.B #$7B,D0		;Are we done yet? (7B is the first character after lowercase "z")
BNE loop_AsciiLow	;if not, loop again
MOVE.B #0,(A0)		;store the null terminator

MOVEM.L (SP)+,D0/A0	;pop D0 and A0

rts

8080 Assembly

This routine takes a memory location in HL, and stores the alphabet there in the form of an $-terminated string that CP/M syscalls can use. 

	org	100h
	jmp	test

	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	;; Store the lowercase alphabet as a CP/M string
	;; ($-terminated), starting at HL.
	;; Destroys: b, c
	
alph:	lxi	b,611ah	; set B='a' and C=26 (counter)
aloop:	mov	m,b	; store letter in memory
	inr	b	; next letter
	inx	h	; next memory position
	dcr	c	; one fewer letter left
	jnz	aloop	; go do the next letter if there is one
	mvi	m,'$'	; terminate the string
	ret 
	
	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	;; Test code
test:	lxi	h,buf	; select buffer
	call	alph	; generate alphabet
	
	lxi	d,buf	; print string in buffer
	mvi	c,9
	call	5 
	rst	0


buf:	ds	27	; buffer to keep the alphabet in

8086 Assembly 

	bits	16
	cpu	8086
	org	100h
section	.text
	jmp	demo
	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	;;;	Store the lowercase alphabet starting at [ES:DI]
	;;;	Destroys AX, CX, DI
alph:	mov	cx,13		; 2*13 words = 26 bytes
	mov	ax,'ab'		; Do two bytes at once 
.loop:	stosw			; Store AX at ES:DI and add 2 to DI
	add	ax,202h		; Add 2 to both bytes (CD, EF, ...)
	loop	.loop
	mov	al,'$'		; MS-DOS string terminator
	stosb
	ret
	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
demo:	mov	di,buf		; Pointer to buffer
	call	alph		; Generate the alphabet
	mov	dx,buf		; Print the contents of the buffer
	mov	ah,9
	int	21h
	ret
section	.bss
buf:	resb	27		; Buffer to store the alphabet in

8th

We take an empty string, and use the "loop" word to create a new character using "'a n:+". The loop passes the current index to the code being iterated, so it starts with 0 and up to 25, adding to the "'a" - which is the numeric value of lowercase "a", and the resultant number is then appended to the string. That converts the number to the appropriate character and appends it: 

"" ( 'a n:+ s:+ ) 0 25 loop
. cr
Output:
abcdefghijklmnopqrstuvwxyz

ABAP

Example with simple write statement

REPORT lower_case_ascii.

WRITE: / to_lower( sy-abcde ).

Example with / without space using CL_DEMO_OUTPUT class

REPORT lower_case_ascii.

cl_demo_output=>new(
          )->begin_section( |Generate lower case ASCII alphabet|
          )->write( REDUCE string( INIT out TYPE string
                                    FOR char = 1 UNTIL char > strlen( sy-abcde )
                                   NEXT out = COND #( WHEN out IS INITIAL THEN sy-abcde(1)
                                                      ELSE |{ out } { COND string( WHEN char <> strlen( sy-abcde ) THEN sy-abcde+char(1) ) }| ) )
          )->write( |Or use the system field: { sy-abcde }|
          )->display( ).

Action! 

byte X

Proc Main()

 For X=97 To 122
  Do
   Put(x)
  Od

Return
Output:
abcdefghijklmnopqrstuvwxyz

Ada

We start with a strong type definition: A character range that can only hold lower-case letters: 

   type Lower_Case is new Character range 'a' .. 'z';

Now we define an array type and initialize the Array A of that type with the 26 letters: 

   type Arr_Type is array (Integer range <>) of Lower_Case;
   A : Arr_Type (1 .. 26) := "abcdefghijklmnopqrstuvwxyz";

Strong typing would catch two errors: (1) any upper-case letters or other symbols in the string assigned to A, and (2) too many or too few letters assigned to A. However, a letter might still appear twice (or more) in A, at the cost of one or more other letters. Array B is safe even against such errors: 

   B : Arr_Type (1 .. 26);
begin
   B(B'First) := 'a';
   for I in B'First .. B'Last-1 loop
      B(I+1) := Lower_Case'Succ(B(I));
   end loop; -- now all the B(I) are different

ALGOL 68

Works with: ALGOL 68G version Any - tested with release 2.6.win32
    # in ALGOL 68, a STRING is an array of characters with flexible bounds #
    # so we can declare an array of 26 characters and assign a string      #
    # containing the lower-case letters to it                              #

    [ 26 ]CHAR lc := "abcdefghijklmnopqrstuvwxyz"

Alternative version 

    # fills lc with the 26 lower-case letters, assuming that               #
    # they are consecutive in the character set, as they are in ASCII      #

    [ 26 ]CHAR lc;

    FOR i FROM LWB lc TO UPB lc
    DO
        lc[ i ] := REPR ( ABS "a" + ( i - 1 ) )
    OD

ALGOL W 

    % set lc to the lower case alphabet          %
    string(26) lc;
    for c := 0 until 25 do lc( c // 1 ) := code( decode( "a" ) + c );

APL

Works with: Dyalog APL
      ⎕UCS 96+⍳26

AppleScript 

-------------------- ALPHABETIC SERIES -------------------
on run
    unlines(map(concat, ¬
        ({enumFromTo("a", "z"), ¬
            enumFromTo("🐟", "🐐"), ¬
            enumFromTo("z", "a"), ¬
            enumFromTo("α", "ω")})))
end run

-------------------- GENERIC FUNCTIONS -------------------

-- concat :: [[a]] -> [a]
-- concat :: [String] -> String
on concat(xs)
    set lng to length of xs
    if 0 < lng and string is class of (item 1 of xs) then
        set acc to ""
    else
        set acc to {}
    end if
    repeat with i from 1 to lng
        set acc to acc & item i of xs
    end repeat
    acc
end concat

-- enumFromTo :: Enum a => a -> a -> [a]
on enumFromTo(m, n)
    if class of m is integer then
        enumFromToInt(m, n)
    else
        enumFromToChar(m, n)
    end if
end enumFromTo

-- enumFromToChar :: Char -> Char -> [Char]
on enumFromToChar(m, n)
    set {intM, intN} to {id of m, id of n}
    set xs to {}
    repeat with i from intM to intN by signum(intN - intM)
        set end of xs to character id i
    end repeat
    return xs
end enumFromToChar

-- mReturn :: First-class m => (a -> b) -> m (a -> b)
on mReturn(f)
    -- 2nd class handler function lifted into 1st class script wrapper. 
    if script is class of f then
        f
    else
        script
            property |λ| : f
        end script
    end if
end mReturn

-- map :: (a -> b) -> [a] -> [b]
on map(f, xs)
    -- The list obtained by applying f
    -- to each element of xs.
    tell mReturn(f)
        set lng to length of xs
        set lst to {}
        repeat with i from 1 to lng
            set end of lst to |λ|(item i of xs, i, xs)
        end repeat
        return lst
    end tell
end map

-- signum :: Num -> Num
on signum(x)
    if x < 0 then
        -1
    else if x = 0 then
        0
    else
        1
    end if
end signum

-- unlines :: [String] -> String
on unlines(xs)
    -- A single string formed by the intercalation
    -- of a list of strings with the newline character.
    set {dlm, my text item delimiters} to ¬
        {my text item delimiters, linefeed}
    set s to xs as text
    set my text item delimiters to dlm
    s
end unlines
Output:
abcdefghijklmnopqrstuvwxyz
🐟🐞🐝🐜🐛🐚🐙🐘🐗🐖🐕🐔🐓🐒🐑🐐
zyxwvutsrqponmlkjihgfedcba
αβγδεζηθικλμνξοπρςστυφχψω

A minor variation would be to perform a mass conversion and character extraction at the end instead of twenty-six individual character id i conversions: 

set l to {}
repeat with i from id of "a" to id of "z"
    set end of l to i
end repeat

return characters of string id l
Output:
{"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"}

Applesoft BASIC 

L$="abcdefghijklmnopqrstuvwxyz"

On the older model Apple II and Apple II plus, it is difficult to enter lower case characters. The following code generates the same string: 

L$="":FORI=1TO26:L$=L$+CHR$(96+I):NEXT

ARM Assembly

Translation of: Z80 Assembly

Uses VASM syntax. PrintString routine courtesy of Chibiakumas

Hardware: Game Boy Advance (ARM7TDMI)

This code generates the lower case ASCII set, stores it in RAM as a string literal, and prints that string to the screen. 

ProgramStart:
	mov sp,#0x03000000			;Init Stack Pointer
	
	mov r4,#0x04000000  		        ;DISPCNT -LCD Control
	mov r2,#0x403    			;4= Layer 2 on / 3= ScreenMode 3
	str r2,[r4]         	                ;hardware specific routine, activates Game Boy's bitmap mode

	mov r0,#0x61				;ASCII "a"
	mov r2,#ramarea
	mov r1,#26					
	
rep_inc_stosb:                                  ;repeatedly store a byte into memory, incrementing the destination and the value stored
                                                ;    each time.
	strB r0,[r2]
	add r0,r0,#1
	add r2,r2,#1
	subs r1,r1,#1
	bne rep_inc_stosb
	mov r0,#255		
	strB r0,[r2]				;store a 255 terminator into r1
	
	mov r1,#ramarea
	bl PrintString                          ;Prints a 255-terminated string using a pre-defined bitmap font. Code omitted for brevity

forever:
        b forever                               ;halt the cpu
Output:

Picture of output

Arturo 

print to [:char] 97..122
Output:
a b c d e f g h i j k l m n o p q r s t u v w x y z

ATS 

(* ****** ****** *)
//
// How to compile:
//
// patscc -DATS_MEMALLOC_LIBC -o lowercase lowercase.dats
//
(* ****** ****** *)
//
#include
"share/atspre_staload.hats"
//
(* ****** ****** *)

implement
main0 () =
{
//
val N = 26
//
val A =
arrayref_tabulate_cloref<char>
(
  i2sz(N), lam(i) => int2char0(char2int0('a') + sz2i(i))
) (* end of [val] *)
//
} (* end of [main0] *)

AutoHotkey

Works with: AutoHotkey 1.1
a :={}
Loop, 26
	a.Insert(Chr(A_Index + 96))

AutoIt 

Func _a2z()
	Local $a2z = ""
	For $i = 97 To 122
		$a2z &= Chr($i)
	Next
	Return $a2z
EndFunc

AWK

Works with: gawk

Generate all character codes, and test each one if it matches the POSIX character class for "lowercase".

Note this is dependent on the locale-setting, and options, e.g. --traditional and --posix 

# syntax: GAWK -f GENERATE_LOWER_CASE_ASCII_ALPHABET.AWK
BEGIN {
    for (i=0; i<=255; i++) {
      c = sprintf("%c",i)
      if (c ~ /[[:lower:]]/) {
        lower_chars = lower_chars c
      }
    }
    printf("%s %d: %s\n",ARGV[0],length(lower_chars),lower_chars)
    exit(0)
}
Output:
gawk_3_1_8 26: abcdefghijklmnopqrstuvwxyz
gawk_4_1_0 65: abcdefghijklmnopqrstuvwxyzƒsozªµºßàáâaäåæçèéêëìíîïdñòóôoöoùúûüy_ÿ

BASIC

BASIC256 

# generate lowercase ascii alphabet
# basic256 1.1.4.0

dim a$(27)                      # populating array for possible future use

for i = 1 to 26
    a$[i] = chr(i + 96)
    print a$[i] + " ";
next i
Output:
a b c d e f g h i j k l m n o p q r s t u v w x y z

BBC BASIC 

      DIM lower&(25)
      FOR i%=0TO25
        lower&(i%)=ASC"a"+i%
      NEXT
      END

Chipmunk Basic

Works with: Chipmunk Basic version 3.6.4
10 for i = asc("a") to asc("z")
20  print chr$(i);
30 next i

Commodore BASIC 

10 FOR I=ASC("A") TO ASC("Z")
20 A$ = A$+CHR$(I)
30 NEXT
40 PRINT CHR$(14) : REM 'SWITCH CHARACTER SET TO LOWER/UPPER CASES
50 PRINT A$

FreeBASIC 

' FB 1.05.0 Win64

' Create a string buffer to store the alphabet plus a final null byte
Dim alphabet As Zstring * 27

' ASCII codes for letters a to z are 97 to 122 respectively
For i As Integer = 0 To 25
  alphabet[i] = i + 97
Next

Print alphabet
Print
Print "Press any key to quit"
Sleep
Output:
abcdefghijklmnopqrstuvwxyz

GW-BASIC

The MSX Basic solution works without any changes.

IS-BASIC 

100 STRING ALPHA$*26
110 LET ALPHA$=""
120 FOR I=ORD("a") TO ORD("z")
130   LET ALPHA$=ALPHA$&CHR$(I)
140 NEXT
150 PRINT ALPHA$

MSX Basic

Works with: MSX BASIC version any
Works with: Applesoft BASIC
Works with: BASICA
Works with: Chipmunk Basic
Works with: GW-BASIC
Works with: PC-BASIC version any
Works with: QBasic
Works with: QB64
10 FOR I = ASC("a") TO ASC("z")
20  PRINT CHR$(I);
30 NEXT I
Output:
abcdefghijklmnopqrstuvwxyz

OxygenBasic 

uses console

int i

for i = asc("a") to asc("z")
  print chr(i);
next i

printl cr "Enter ..."
waitkey
Output:
abcdefghijklmnopqrstuvwxyz

PureBasic 

Dim lower_case('z' - 'a') ;indexing goes from 0 -> 25
For i = 0 To ArraySize(lower_case())
  lower_case(i) = i + 'a'
Next

QBasic

Works with: QBasic version 1.1
Works with: QuickBasic version 4.5
Works with: QB64
Works with: True BASIC
DIM a$(27)

FOR i = 1 to 26
    LET a$(i) = CHR$(i + 96)
    PRINT a$(i);
NEXT i
END

True BASIC

Works with: QBasic version 1.1
Works with: QuickBasic version 4.5
DIM a$(27)

FOR i = 1 to 26
    LET a$(i) = CHR$(i + 96)
    PRINT a$(i);
NEXT i
END

XBasic

Works with: Windows XBasic
PROGRAM	"progname"
VERSION	"0.0000"

DECLARE FUNCTION Entry ()

FUNCTION Entry ()
	DIM a$[27]

	FOR i = 1 TO 26
		a$[i] = CHR$(i + 96)
		PRINT a$[i];
	NEXT i

END FUNCTION
END PROGRAM

Yabasic

Works with: QBasic version 1.1
Works with: QuickBasic version 4.5
Works with: Run BASIC
for i = asc("a") to asc("z")
 print chr$(i);
next i

Run BASIC

Works with: Just BASIC
Works with: Liberty BASIC
for i = asc("a") to asc("z")
 print chr$(i);
next i

Output: 

abcdefghijklmnopqrstuvwxyz

uBasic/4tH 

For x= ORD("a") To ORD("z") : @(x - ORD("a")) = x : Next

ZX Spectrum Basic

Translation of: BBC_BASIC
10 DIM l$(26): LET init= CODE "a"-1
20 FOR i=1 TO 26
30 LET l$(i)=CHR$ (init+i)
40 NEXT i
50 PRINT l$

BaCon

Using the inline loop construct. 

PRINT LOOP$(26, CHR$(96+_))
Output:
abcdefghijklmnopqrstuvwxyz

Batch File 

@echo off
setlocal enabledelayedexpansion

:: This code appends the ASCII characters from 97-122 to %alphabet%, removing any room for error.

for /l %%i in (97,1,122) do (
  cmd /c exit %%i
  set "alphabet=!alphabet! !=exitcodeAscii!"
)
echo %alphabet%
pause>nul
Output:
 a b c d e f g h i j k l m n o p q r s t u v w x y z

Befunge

The left hand side pushes the sequence 'a' to 'z' onto the stack in reverse order with a null terminator (a fairly typical Befunge pattern). The right hand side is just printing it out again to test. 

0"z":>"a"`#v_  >:#,_$@
     ^:- 1:<

BQN 

'a'+↕26

Bracmat 

  a:?seq:?c
&   whl
  ' ( chr$(asc$!c+1):~>z:?c
    & !seq !c:?seq
    )
& !seq

Brainf*** 

Make room for 26 characters
>>>>>>>>>>>>>
>>>>>>>>>>>>>
Set counter to 26
>>
+++++++++++++
+++++++++++++
Generate the numbers 1 to 26
[-<<    Decrement counter
  [+<]  Add one to each nonzero cell moving right to left
  +     Add one to first zero cell encountered
  [>]>  Return head to counter
]
<<
Add 96 to each cell
[
++++++++++++++++
++++++++++++++++
++++++++++++++++
++++++++++++++++
++++++++++++++++
++++++++++++++++
<]
Print each cell
>[.>]
++++++++++. \n

Uncommented: 

>>>>>>>>>>>>>>>>>>>>>>>>>>>>++++++++++++++++++++++++++[-<<[+<]
+[>]>]<<[+++++++++++++++++++++++++++++++++++++++++++++++++++++
+++++++++++++++++++++++++++++++++++++++++++<]>[.>]++++++++++.

A smaller and faster solution: 

++++++++++++++++++++++++++ >
++++++++++++++++++++++++++ ++++++
++++++++++++++++++++++++++ ++++++
++++++++++++++++++++++++++ ++++++
< [ - > + . < ]
Output:
abcdefghijklmnopqrstuvwxyz

Burlesque 

blsq ) @azr\sh
abcdefghijklmnopqrstuvwxyz

C 

#include <stdlib.h>

#define N 26

int main() {
    unsigned char lower[N];

    for (size_t i = 0; i < N; i++) {
        lower[i] = i + 'a';
    }

    return EXIT_SUCCESS;
}

C#

Simple Linq 1 liner solution 

using System;
using System.Linq;

internal class Program
{
    private static void Main()
    {
        Console.WriteLine(String.Concat(Enumerable.Range('a', 26).Select(c => (char)c)));
    }
}
Output:
abcdefghijklmnopqrstuvwxyz

Old style Property and enumerable based solution 

namespace RosettaCode.GenerateLowerCaseASCIIAlphabet
{
    using System;
    using System.Collections.Generic;

    internal class Program
    {
        private static IEnumerable<char> Alphabet
        {
            get
            {
                for (var character = 'a'; character <= 'z'; character++)
                {
                    yield return character;
                }
            }
        }

        private static void Main()
        {
            Console.WriteLine(string.Join(string.Empty, Alphabet));
        }
    }
}
Output:
abcdefghijklmnopqrstuvwxyz

C++

C++ can do the task in the identical way as C, or else, it can use a STL function.

Works with: C++11
#include <string>
#include <numeric>

int main() {
    std::string lower(26,' ');

    std::iota(lower.begin(), lower.end(), 'a');
}

Clojure 

(map char (range (int \a) (inc (int \z))))
Output:
(\a \b \c \d \e \f \g \h \i \j \k \l \m \n \o \p \q \r \s \t \u \v \w \x \y \z)

CLU 

alph = proc () returns (string)
    a: int := char$c2i('a')
    letters: array[char] := array[char]$predict(1,26)
    for i: int in int$from_to(0, 25) do
        array[char]$addh(letters, char$i2c(a + i))
    end
    return(string$ac2s(letters))
end alph

% test
start_up = proc ()
    stream$putl(stream$primary_output(), alph())
end start_up
Output:
abcdefghijklmnopqrstuvwxyz

COBOL

Strings in COBOL are mutable and can be subscripted: each time we go round the loop, we assign to a one-character-long section of the string we are building. 

identification division.
program-id. lower-case-alphabet-program.
data division.
working-storage section.
01  ascii-lower-case.
    05 lower-case-alphabet pic a(26).
    05 character-code      pic 999.
    05 loop-counter        pic 99.
procedure division.
control-paragraph.
    perform add-next-letter-paragraph varying loop-counter from 1 by 1
    until loop-counter is greater than 26.
    display lower-case-alphabet upon console.
    stop run.
add-next-letter-paragraph.
    add 97 to loop-counter giving character-code.
    move function char(character-code) to lower-case-alphabet(loop-counter:1).
Output:
abcdefghijklmnopqrstuvwxyz

CoffeeScript 

(String.fromCharCode(x) for x in [97..122])

Comal 

dim alphabet$ of 26
for i := 1 to 26
  alphabet$(i) := chr$(ord("a") - 1 + i)
endfor i
print alphabet$
Output:
abcdefghijklmnopqrstuvwxyz

Common Lisp

;; as a list 

(defvar *lower*
  (loop with a = (char-code #\a)
        for i below 26
        collect (code-char (+ a i))))

;; as a string 

(defvar *lowercase-alphabet-string*
  (map 'string #'code-char (loop
			      for c from (char-code #\a) to (char-code #\z)
			      collect c))
  "The 26 lower case letters in alphabetical order.")

;; verify 

(assert (= 26 (length *lowercase-alphabet-string*) (length *lower*)))
(assert (every #'char< *lowercase-alphabet-string* (subseq *lowercase-alphabet-string* 1)))
(assert (apply #'char< *lower*))
(assert (string= *lowercase-alphabet-string* (coerce *lower* 'string)))

Cowgol 

include "cowgol.coh";

# Generate the alphabet and store it at the given location
# It is assumed that there is enough space (27 bytes)
sub alph(buf: [uint8]): (out: [uint8]) is
    out := buf;
    var letter: uint8 := 'a';
    while letter <= 'z' loop
        [buf] := letter;
        letter := letter + 1;
        buf := @next buf;
    end loop;
    [buf] := 0;
end sub;

# Use the subroutine to print the alphabet
var buf: uint8[27]; # make room for the alphabet
print(alph(&buf as [uint8]));
Output:
abcdefghijklmnopqrstuvwxyz

D

The lower case ASCII letters of the Phobos standard library: 

import std.ascii: lowercase;

void main() {}

The generation of the ASCII alphabet array: 

void main() {
    char['z' - 'a' + 1] arr;

    foreach (immutable i, ref c; arr)
        c = 'a' + i;
}

An alternative version: 

void main() {
    import std.range, std.algorithm, std.array;

    char[26] arr = 26.iota.map!(i => cast(char)('a' + i)).array;
}

Another version: 

void main() {
    char[] arr;

    foreach (immutable char c; 'a' .. 'z' + 1)
        arr ~= c;

    assert(arr == "abcdefghijklmnopqrstuvwxyz");
}

Dart 

void main() {
  List<String> lower =
      List.generate(26, (index) => String.fromCharCode(97 + index));
  print(lower);
}
Output:
[a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z]

dc

Construct the numerical representation of the desired output and print it. 

122 [ d 1 - d 97<L 256 * + ] d sL x P

Output: 

abcdefghijklmnopqrstuvwxyz

Delphi 

program atoz;

var
  ch : char;

begin
  for ch in ['a'..'z'] do
  begin
    write(ch);
  end;
end.
Output:
abcdefghijklmnopqrstuvwxyz

Draco 

/* Generate the lowercase alphabet and store it in a buffer */
proc alph(*char buf) *char:
    channel output text ch;
    char letter;
    open(ch, buf);
    for letter from 'a' upto 'z' do
        write(ch; letter)
    od;
    close(ch);
    buf
corp

/* Use the function to print the alphabet */
proc main() void:
    [27] char buf; /* one byte extra for the string terminator */
    writeln(alph(&buf[0]))
corp
Output:
abcdefghijklmnopqrstuvwxyz

DuckDB

Works with: DuckDB version V1.0
select array_agg(chr(ix::INT) order by ix) as lowercase
from unnest(range(ascii('a'), 1 + ascii('z'))) _(ix);

or equivalently as a one-liner: 

select list_transform(generate_series(ascii('a'), ascii('z')), x -> chr(x::INT)) as lowercase;
Output:
┌────────────────────────────────────────────────────────────────────────────────┐
│                                   lowercase                                    │
│                                   varchar[]                                    │
├────────────────────────────────────────────────────────────────────────────────┤
│ [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z] │
└────────────────────────────────────────────────────────────────────────────────┘

DUP

In DUP, strings between double quotes are stored in a numerically addressed array. The integer before the first " which gets pushed on the data stack, defines the cell address in which the ASCII value of first character of the string will be stored. All following characters will be stored like an array as values in the following cells. At the end, DUP pushes the length of the string on the data stack. 

0"abcdefghijklmnopqrstuvwxyz"        {store character values of string in cells 0..length of string-1}
26[$][^^-;,1-]#                      {Loop from 26-26 to 26-0, print the respective cell contents to STDOUT}

Output:

abcdefghijklmnopqrstuvwxyz

Dyalect

Generates a lazy sequence and prints it to a standard output: 

print << ('a'..'z').ToArray()

EasyLang 

# Generated on an array
for i = 97 to 122
   alphabet$[] &= strchar i
.
print alphabet$[]
# Generated on a string
for i = 97 to 122
   alphabet$ &= strchar i
.
print alphabet$

EchoLisp 

;; 1)
(define \a (first (string->unicode "a")))
(for/list ((i 25)) (unicode->string (+ i \a)))
    → (a b c d e f g h i j k l m n o p q r s t u v w x y)

;;2) using a sequence
(lib 'sequences)

(take ["a" .. "z"] 26)
    → (a b c d e f g h i j k l m n o p q r s t u v w x y z)

; or
(for/string ((letter ["a" .. "z"])) letter)
    → abcdefghijklmnopqrstuvwxyz

Elena

ELENA 6.x : 

import extensions;
import system'collections;
 
singleton Alphabet : Enumerable
{
    Enumerator enumerator() = new Enumerator
    {
        char current;
 
        get Value() = current;
 
        bool next()
        {
            if (nil==current)
            {
                current := $97
            }
            else if (current != $122)
            {
                current := (current.toInt() + 1).toChar()
            }
            else
            {
                ^ false
            };
 
            ^ true
        }
 
        reset()
        {
            current := nil
        }
 
        enumerable() = self;
    };
}
 
public program()
{
    console.printLine(Alphabet)
}
Output:
a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z

Elixir 

iex(1)> Enum.to_list(?a .. ?z)
'abcdefghijklmnopqrstuvwxyz'
iex(2)> Enum.to_list(?a .. ?z) |> List.to_string
"abcdefghijklmnopqrstuvwxyz"

Erlang 

lists:seq($a,$z).
Output:
"abcdefghijklmnopqrstuvwxyz"

Excel

LAMBDA

Binding the name showAlphabet to the following lambda expression in the Name Manager of the Excel WorkBook:

(See LAMBDA: The ultimate Excel worksheet function)

Works with: Office 365 betas 2021
showAlphabet
=LAMBDA(az,
    ENUMFROMTOCHAR(
        MID(az, 1, 1)
    )(
        MID(az, 2, 1)
    )
)

and also assuming the following generic binding in the Name Manager for the WorkBook: 

ENUMFROMTOCHAR
=LAMBDA(a, 
    LAMBDA(z, 
        LET(
            aCode, UNICODE(a),
            zCode, UNICODE(z),
            
            UNICHAR(
                IF(zCode >= aCode,
                    SEQUENCE(
                        1, 1 + zCode - aCode,
                        aCode, 1
                    ),
                    SEQUENCE(
                        1, 1 + aCode - zCode,
                        aCode, -1
                    )
                )
            )
        )
    )
)
Output:

The formula in cell B2, for example, defines an array which populates the whole range B2:AA2

fx =showAlphabet(A2)
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z AA AB
1 From to
2 az a b c d e f g h i j k l m n o p q r s t u v w x y z
3 αω α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ ς σ τ υ φ χ ψ ω
4 את א ב ג ד ה ו ז ח ט י ך כ ל ם מ ן נ ס ע ף פ ץ צ ק ר ש ת
5 תא ת ש ר ק צ ץ פ ף ע ס נ ן מ ם ל כ ך י ט ח ז ו ה ד ג ב א
6 za z y x w v u t s r q p o n m l k j i h g f e d c b a
7 ωα ω ψ χ φ υ τ σ ς ρ π ο ξ ν μ λ κ ι θ η ζ ε δ γ β α

F# 

let lower = ['a'..'z']

printfn "%A" lower

Factor

Strings are represented as fixed-size mutable sequences of Unicode code points. 

USING: spelling ; ! ALPHABET

ALPHABET print
0x61 0x7A [a,b] >string print
: russian-alphabet-without-io ( -- str ) 0x0430 0x0450 [a,b) >string ;
: russian-alphabet ( -- str ) 0x0451 6 russian-alphabet-without-io insert-nth ;
russian-alphabet print
Output:
abcdefghijklmnopqrstuvwxyz
abcdefghijklmnopqrstuvwxyz
абвгдеёжзийклмнопрстуфхцчшщъыьэюя

FALSE 

'a[$'z>~][$,1+]#%
Output:
abcdefghijklmnopqrstuvwxyz

Fermat 

Array locase[1,26];
[locase]:=[<i=1,26>'a'+i-1];
!([locase:char);
Output:
abcdefghijklmnopqrstuvwxyz

Forth

Generate a string filled with the lowercase ASCII alphabet 

: printit    26 0 do   [char] a I + emit   loop ;

Or coded another way 

: printit2  [char] z 1+  [char] a  do  I emit  loop ;

We could do something more complicated and allocate space for a string and fill it. Two methods are demonstrated below 

create lalpha    27 chars allot    \ create a string in memory for 26 letters and count byte

: ]lalpha ( index -- addr )        \ index the string like an array (return an address)
          lalpha char+ + ;       

\ method 1: fill memory with ascii values using a loop
: fillit ( -- )               
         26 0
         do
           [char] a I +            \ calc. the ASCII value, leave on the stack  
           I ]lalpha c!            \ store the value on stack in the string at index I
         loop
         26 lalpha c! ;            \ store the count byte at the head of the string


\ method 2: load with a string literal 
: Loadit    s" abcdefghijklmnopqrstuvwxyz" lalpha PLACE ;
Output:

Test at the console 

printit  abcdefghijklmnopqrstuvwxyz ok

fillit ok
lalpha count type abcdefghijklmnopqrstuvwxyz ok
lalpha count erase ok
lalpha count type ok
loadit ok
lalpha count type abcdefghijklmnopqrstuvwxyz ok

Fortran

Works with: Fortran version 90 and later
  character(26) :: alpha
  integer :: i

  do i = 1, 26
    alpha(i:i) = achar(iachar('a') + i - 1)
  end do

Free Pascal

One can use set constructors like in Delphi. alphabet’s type will be set of char. 

program lowerCaseAscii(input, output, stdErr);
const
	alphabet = ['a'..'z'];
begin
end.

Note, Pascal does not define that the letters A through Z are contiguous, the set constructor above assumes that, though. However, the FPC – the FreePascal compiler – virtually only works on systems, that use at least ASCII as common denominator.

Frink

The following produces a lazy enumerating sequence of the characters. 

map["char", char["a"] to char["z"]]

To produce a non-lazy array of the characters, you can wrap the above in a toArray call: 

toArray[map["char", char["a"] to char["z"]]]

Furor 

#k 'a 'z ++ {|| {} print SPACE |} NL end
Output:
a b c d e f g h i j k l m n o p q r s t u v w x y z

Peri 

###sysinclude standard.uh
#k 'a 'z ++ {{ , {{}} print SPACE }} NL end
Output:
a b c d e f g h i j k l m n o p q r s t u v w x y z

FutureBasic 

long i
for i = asc("a") to asc("z")
  print chr$(i);
next
HandleEvents
Output:
abcdefghijklmnopqrstuvwxyz


Gambas

Click this link to run this code 

Public Sub Main()
Dim siCount As Short

For siCount = Asc("a") To Asc("z")
  Print Chr(siCount);
Next

End

Output: 

abcdefghijklmnopqrstuvwxyz

Go 

func loweralpha() string {
	p := make([]byte, 26)
	for i := range p {
		p[i] = 'a' + byte(i)
	}
	return string(p)
}

Groovy 

def lower = ('a'..'z')

Test 

assert 'abcdefghijklmnopqrstuvwxyz' == lower.join('')

Haskell 

lower = ['a' .. 'z']

main = print lower

Or, equivalently: 

alpha :: String
alpha = enumFromTo 'a' 'z'

main :: IO ()
main = print alpha
Output:
"abcdefghijklmnopqrstuvwxyz"

Hoon 

`(list cord)`(gulf 97 122)
Output:
> `(list cord)`(gulf 97 122)
<|a b c d e f g h i j k l m n o p q r s t u v w x y z|>

Huginn 

import Algorithms as algo;
import Text as text;

main() {
  print(
    "{}\n".format(
      text.character_class( text.CHARACTER_CLASS.LOWER_CASE_LETTER )
    )
  );
  print(
    "{}\n".format(
      algo.materialize(
        algo.map(
          algo.range( integer( 'a' ), integer( 'z' ) + 1 ),
          character
        ),
        string
      )
    )
  );
}
Output:
abcdefghijklmnopqrstuvwxyz
abcdefghijklmnopqrstuvwxyz

Icon and Unicon

You can just use the keyword: 

&lcase

(although this technically produces a character set instead of a string, it can be used as a string, so string subscripting, generation, etc., all work).

E.g. 

every a := put([], !&lcase) # array of 1 character per element
c := create !&lcase         # lazy generation of letters in sequence

procedure lower_case_letters()               # entry point for function lower_case_letters
	return &lcase                        # returning lower caser letters represented by the set &lcase
end

procedure main(param)                        # main procedure as entry point
	write(lower_case_letters())          # output of result of function lower_case_letters()
end

Insitux 

(-> (map char-code "az")
    (adj _ inc)
    (.. range)
    (map char-code))
["a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m" "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z"]

J

Solution:

   thru=: <. + i.@(+*)@-~
   thru&.(a.&i.)/'az'
abcdefghijklmnopqrstuvwxyz

or

   u:97+i.26
abcdefghijklmnopqrstuvwxyz

or

   ([-.toupper)a.
abcdefghijklmnopqrstuvwxyz

and, obviously, other variations are possible.

Java 

char[] lowerAlphabet() {
    char[] letters = new char[26];
    for (int code = 97; code < 123; code++)
        letters[code - 97] = (char) code;
    return letters;
}

abcdefghijklmnopqrstuvwxyz

An alternate implementation 

public class LowerAscii {

    public static void main(String[] args) {
        StringBuilder sb = new StringBuilder(26);
        for (char ch = 'a'; ch <= 'z'; ch++)
            sb.append(ch);
        System.out.printf("lower ascii: %s, length: %s", sb, sb.length());
    }
}

Output: 

lower ascii: abcdefghijklmnopqrstuvwxyz, length: 26

JavaScript

ES5

In ES5, we can use String.fromCharCode(), which suffices for Unicode characters which can be represented with one 16 bit number.

For Unicode characters beyond this range, in ES5 we have to enter a pair of Unicode number escapes. 

(function (cFrom, cTo) {

  function cRange(cFrom, cTo) {
    var iStart = cFrom.charCodeAt(0);

    return Array.apply(
      null, Array(cTo.charCodeAt(0) - iStart + 1)
    ).map(function (_, i) {

      return String.fromCharCode(iStart + i);

    });
  }

  return cRange(cFrom, cTo);

})('a', 'z');

Returns: 

["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"]

ES6

In ES6, the new String.fromCodePoint() method can can return 4-byte characters (such as Emoji, for example) as well as the usual 2-byte characters. 

(function (lstRanges) {

  function cRange(cFrom, cTo) {
    var iStart = cFrom.codePointAt(0);

    return Array.apply(
      null, Array(cTo.codePointAt(0) - iStart + 1)
    ).map(function (_, i) {

      return String.fromCodePoint(iStart + i);

    });
  }

  return lstRanges.map(function (lst) {
    return cRange(lst[0], lst[1]);
  });

})([
  ['a', 'z'],
  ['🐐', '🐟']
]);

Output: 

[["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"],
 ["🐐", "🐑", "🐒", "🐓", "🐔", "🐕", "🐖", "🐗", "🐘", "🐙", "🐚", "🐛", "🐜", "🐝", "🐞", "🐟"]]
Works with: ECMAScript version 6
var letters = []
for (var i = 97; i <= 122; i++) {
    letters.push(String.fromCodePoint(i))
}

Or, if we want to write a more general ES6 function: 

(() => {
    // enumFromTo :: Enum a => a -> a -> [a]
    const enumFromTo = (m, n) => {
        const [intM, intN] = [m, n].map(fromEnum),
            f = typeof m === 'string' ? (
                (_, i) => chr(intM + i)
            ) : (_, i) => intM + i;
        return Array.from({
            length: Math.floor(intN - intM) + 1
        }, f);
    };


    // GENERIC FUNCTIONS ------------------------------------------------------

    // compose :: (b -> c) -> (a -> b) -> (a -> c)
    const compose = (f, g) => x => f(g(x));

    // chr :: Int -> Char
    const chr = x => String.fromCodePoint(x);

    // ord :: Char -> Int
    const ord = c => c.codePointAt(0);

    // fromEnum :: Enum a => a -> Int
    const fromEnum = x => {
        const type = typeof x;
        return type === 'boolean' ? (
            x ? 1 : 0
        ) : type === 'string' ? ord(x) : x;
    };

    // map :: (a -> b) -> [a] -> [b]
    const map = (f, xs) => xs.map(f);

    // show :: a -> String
    const show = x => JSON.stringify(x);

    // uncurry :: Function -> Function
    const uncurry = f => args => f.apply(null, args);

    // unlines :: [String] -> String
    const unlines = xs => xs.join('\n');

    // unwords :: [String] -> String
    const unwords = xs => xs.join(' ');

    // TEST -------------------------------------------------------------------
    return unlines(map(compose(unwords, uncurry(enumFromTo)), [
        ['a', 'z'],
        ['α', 'ω'],
        ['א', 'ת'],
        ['🐐', '🐟']
    ]));
})();
Output:
a b c d e f g h i j k l m n o p q r s t u v w x y z
α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ ς σ τ υ φ χ ψ ω
א ב ג ד ה ו ז ח ט י ך כ ל ם מ ן נ ס ע ף פ ץ צ ק ר ש ת
🐐 🐑 🐒 🐓 🐔 🐕 🐖 🐗 🐘 🐙 🐚 🐛 🐜 🐝 🐞 🐟

Joy 

'a ['z =] ["" cons] [dup succ] [cons] linrec.

jq 

"az" | explode | [range( .[0]; 1+.[1] )] | implode'

produces:

"abcdefghijklmnopqrstuvwxyz"

Jsish 

/* Generate the lower case alphabet with Jsish, assume ASCII */
var letterA = "a".charCodeAt(0);
var lowers = Array(26);
for (var i = letterA; i < letterA + 26; i++) {
    lowers[i - letterA] = Util.fromCharCode(i);
}
puts(lowers);
puts(lowers.join(''));
puts(lowers.length);

/*
=!EXPECTSTART!=
[ "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z" ]
abcdefghijklmnopqrstuvwxyz
26
=!EXPECTEND!=
*/
Output:
prompt$ jsish generate-lowers.jsi
[ "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z" ]
abcdefghijklmnopqrstuvwxyz
26
prompt$ jsish -u generate-lowers.jsi
[PASS] generate-lowers.jsi

Julia

Works with: Julia version 0.6
@show collect('a':'z')
@show join('a':'z')
Output:
collect('a':'z') = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
join('a':'z') = "abcdefghijklmnopqrstuvwxyz"

K

`c$ casts a list of integers to a string of characters; !26 produces a list of the integers from 0 to 25. So the lower-case ASCII alphabet can be generated using: 

`c$97+!26
Output:
"abcdefghijklmnopqrstuvwxyz"

Keg 

a(55*|:1+)

Kotlin 

// version 1.3.72

fun main() {
    val alphabet = CharArray(26) { (it + 97).toChar() }.joinToString("")

    println(alphabet)
}
Output:
abcdefghijklmnopqrstuvwxyz

Lambdatalk 

1) We define code2char & char2code as primitives:

{script 
LAMBDATALK.DICT["char2code"] = function() {
  var args = arguments[0].trim();
  return args.charCodeAt(0);
};

LAMBDATALK.DICT["code2char"] = function() {
  var args = arguments[0].trim();
  return String.fromCharCode(args);
};
}

2) and we use them:

{S.map code2char {S.serie {char2code a} {char2code z}}}
-> a b c d e f g h i j k l m n o p q r s t u v w x y z

{S.map code2char {S.serie {char2code 0} {char2code 9}}}
-> 0 1 2 3 4 5 6 7 8 9

Lang 

&alphabet = fn.arrayGenerateFrom(fn.combBX(fn.char, fn.add, a), 26)
fn.println(&alphabet)

# As string (Strings are called text in Lang)
$alphabetText = fn.join(\e, &alphabet)
fn.println($alphabetText)
Output:
[a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z]
abcdefghijklmnopqrstuvwxyz

LC3 Assembly 

        .ORIG      0x3000

        LD         R0,ASCIIa
        LD         R1,ASCIIz
        NOT        R1,R1

LOOP    OUT
        ADD        R0,R0,1
        ADD        R2,R0,R1
        BRN        LOOP

        HALT

ASCIIa  .FILL      0x61
ASCIIz  .FILL      0x7A

Output: 

abcdefghijklmnopqrstuvwxyz

Lingo 

alphabet = []
repeat with i = 97 to 122
  alphabet.add(numtochar(i))
end repeat
put alphabet
-- ["a", "b", "c", ... , "x", "y", "z"]

Straightforward, assuming ASCII: 

show map "char iseq 97 122

Slightly less straightforward, but without the magic numbers: 

show map "char apply "iseq map "ascii [a z]

Same output either way:

Output:
[a b c d e f g h i j k l m n o p q r s t u v w x y z]

Lua

to table

function getAlphabet ()
    local letters = {}
    for ascii = 97, 122 do table.insert(letters, string.char(ascii)) end
    return letters
end

local alpha = getAlphabet()
print(alpha[25] .. alpha[1] .. alpha[25])
Output:
yay

to string

#!/usr/bin/env luajit
local function ascii(f,t) local tab={} for i=f,t do tab[#tab+1]=string.char(i) end
	return table.concat(tab)
end
print(ascii(97,122))
Output:
> ./lowercaseascii.lua  
abcdefghijklmnopqrstuvwxyz

M2000 Interpreter 

\\ old style Basic, including a Binary.Or() function
Module OldStyle {
      10 LET A$=""
      20 DEF FNUP$(I)=""""+CHR$(BINARY.OR(I, 32))+""""
      30 FOR I=ASC("A") TO ASC("Y")
      40 LET A$= A$ + FNUP$(I, 32)+", "
      50 NEXT I
      60 LET A$ = A$+ FNUP$(I, 32)
      70 PRINT A$
}
CALL OldStyle

Module new_style {
	a=("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z")
	map1= lambda ->{push binary.or(asc(letter$), 32)}
	map2= lambda ->{push chr$(number)}
	Print """"+a#map(map1, map2)#str$({", "})+""""
}
new_style
Output:

"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z" 


=={{header|Maple}}==
<syntaxhighlight lang="maple">seq(StringTools:-Char(c), c = 97 .. 122);</syntaxhighlight>
{{Out}}
<pre>"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"

Mathcad

Works with: Mathcad Prime version Mathcad Prime Express
Library: None

Note: ":=" is the definition operator "=" is the evaluation operator

The actual Mathcad worksheet is at https://community.ptc.com/t5/PTC-Mathcad/Rosetta-Code-Generate-Lower-Case-ASCII-Alphabet/m-p/670829#M190552

The Haskell-like '--' marker preceding each comment is not necessary in Mathcad, and is only there to indicate text rather than an expression.

Method 1: Using a Range Variable. 

-- user-defined function that returns the ASCII code for string character ch.
code(ch):=str2vec(ch)[0

-- number of lower-case ASCII characters
N:=26

-- range variable covering the relative indices of the lower-case characters within the ASCII character set (0 = 'a', 25 = 'z').
k:=0..N-1

-- ASCII code for letter 'a' (a=97 ).
a:=code("a")

-- iterate over k to produce a vector of lower case ASCII character codes
lcCodes[k:=k+a

-- convert vector to string of ordered ASCII lower-case characters.
lcString:=vec2str(lcCodes)
lcString="abcdefghijklmnopqrstuvwxyz"  

-- Characters are indexable within the string; for example: substr(lcString,3,1)="d"

Method 2: Using a Function. 

-- Mathcad Express lacks the programming capability of Mathcad Prime, so uses the built-in if function to implement a recursive solution (if(predicate,true expr, false expr)).  

-- char(cd): return the string character with code cd.
char(cd):=vec2str([cd])

-- charseq(m,n): return a string containing an ordered list of the characters whose codes lie between m and n, inclusive.
charseq(m,n):=if(m>=n,char(m),concat(char(m),charseq(m+1,n)))

charseq(code("a"),code("z"))="abcdefghijklmnopqrstuvwxyz"
charseq(code("A"),code("Z"))="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
charseq(code("0"),code("9"))="0123456789"
charseq(code("а"),code("я"))="абвгдежзийклмнопрстуфхцчшщъыьэюя"
charseq(code("α"),code("ω"))="αβγδεζηθικλμνξοπρςστυφχψω"

Mathematica / Wolfram Language 

start = 97;
lowerCaseLetters = Table[FromCharacterCode[start + i], {i, 0, 25}]
Output:
{"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"}

MATLAB / Octave 

  'a':'z'

or alternatively 

  char(96+[1:26])
Output:
  abcdefghijklmnopqrstuvwxyz

Maxima 

delete([], makelist(if(alphacharp(ascii(i))) then parse_string(ascii(i)) else [], i, 96, 122));
Output:
 [a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z]

Mercury 

:- module gen_lowercase_ascii.
:- interface.

:- import_module io.

:- pred main(io::di, io::uo) is det.

:- implementation.

:- import_module char, int, list.

main(!IO) :-
    list.map(char.det_from_int, 0'a .. 0'z, Alphabet),
    io.print_line(Alphabet, !IO).

:- end_module gen_lowercase_ascii.
Output:
['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']

MiniScript 

letters = []
for i in range(code("a"), code("z"))
    letters.push char(i)
end for

print letters
Output:
["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"]

MIPS Assembly 

main:
li $t0,'a'
li $t1,26
loop:
jal PrintChar ;prints the low 8 bits of $t0 as an ascii character (unimplemented routine)
nop           ;branch delay slot
subiu $t1,1
bne $t1,loop
addiu $t0,1

end_program:
j end_program ;halt the cpu - we're done
nop

MUMPS

Caché

Works with: Caché ObjectScript
LOWASCMIN
    set lowstr = ""
    for i = 97:1:122 set delim = $select(i=97:"",1:",") set lowstr = lowstr_delim_$char(i)
    write lowstr
    quit
Output:


SAMPLES>DO ^LOWASCMIN
a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z

Standard MUMPS

Works with: DSM, MSM
LONG	SET D="" 
	FOR X=97:1:122 WRITE D,$C(X) SET D=","
	WRITE !
        QUIT
	;
SHORT	S D="" 
	F X=97:1:122 W D,$C(X) S D=","
	W !
        Q
Output:


MGR>DO LONG
a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z         
MGR>D SHORT
a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z

Nanoquery 

lowercase = list()
for i in range(ord("a"), ord("z"))
     lowercase.append(chr(i))
end
println lowercase
Output:
[a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z]

Neko 

/**
 <doc>Generate lower case ASCII, in Neko</doc>
**/

var slot = 25
var generated = $smake(slot + 1)
var lower_a = $sget("a", 0)

/* 'a'+25 down to 'a'+0 */
while slot >= 0 {
    $sset(generated, slot, slot + lower_a)
    slot -= 1
}

$print(generated, "\n")
Output:
prompt$ nekoc generate-lower.neko
prompt$ neko generate-lower.n
abcdefghijklmnopqrstuvwxyz

NESL 

lower_case_ascii = {code_char(c) : c in [97:123]};

Rationale

Since NetLogo has no "ASC" type reporters, we will have to enumerate the characters. To make an omission easier to detect, we use a phrase, instead of a list Since the phrase has duplicates and spaces, we use other list tools to produce just the sorted alphabet

Code

to-report alphabet-lower
  let sample "sphinx of black quartz judge my vow"
  let alphabet sort remove-duplicates remove " " n-values length sample [ c -> item c sample ]
  if length alphabet != 26 [ user-message "ERROR: invalid sample for alphabet function" ]
  report alphabet
end

Output

observer> print alphabet-lower
[a b c d e f g h i j k l m n o p q r s t u v w x y z]
observer> write alphabet-lower
 ["a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m" "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z"]

Nim 

# A slice just contains the first and last value
let alpha: Slice[char] = 'a'..'z'
echo alpha # (a: a, b: z)

# but can be used to check if a character is in it:
echo 'f' in alpha # true
echo 'G' in alpha # false

# A set contains all elements as a bitvector:
let alphaSet: set[char] = {'a'..'z'}
echo alphaSet # {a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z}
echo 'f' in alphaSet # true
var someChars = {'a','f','g'}
echo someChars <= alphaSet # true

import sequtils
# A sequence:
let alphaSeq = toSeq 'a'..'z'
echo alphaSeq # @[a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z]
echo alphaSeq[10] # k

Nu 

seq char a z

OCaml 

# Array.make 26 'a' |> Array.mapi (fun i c -> int_of_char c + i |> char_of_int);;
- : char array =
[|'a'; 'b'; 'c'; 'd'; 'e'; 'f'; 'g'; 'h'; 'i'; 'j'; 'k'; 'l'; 'm'; 'n'; 'o';
  'p'; 'q'; 'r'; 's'; 't'; 'u'; 'v'; 'w'; 'x'; 'y'; 'z'|]

Alternative version: 

Array.init 26 (fun x -> char_of_int (x + int_of_char 'a'))

Oforth

Oforth characters are integers. This list is a list of 26 integers 

'a' 'z' seqFrom

If necessary, these integers can be added to a string to have a indexed string of chars 

StringBuffer new 'a' 'z' seqFrom apply(#<<c)

PARI/GP 

Strchr(Vecsmall([97..122]))

Output:

"abcdefghijklmnopqrstuvwxyz"

Pascal 

program lowerCaseAscii(input, output, stdErr);
var
	alphabet: set of char;
begin
	// as per ISO 7185, 'a'..'z' do not necessarily have to be contiguous
	alphabet := [
			'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
			'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
		];
end.

PascalABC.NET 

##
var a := Arr('a'..'z');
a.Println;
var s := ('a'..'z').JoinToString(' ');;
s.Println
Output:
abcdefghijklmnopqrstuvwxyz
a b c d e f g h i j k l m n o p q r s t u v w x y z

Perl 

print 'a'..'z'

Phix 

with javascript_semantics
string az = ""
for ch='a' to 'z' do
    az &= ch
end for
?az
?tagset('z','a')
?tagstart('a',26)

Using tagset() is obviously easier, but you have to remember its parameters are (finish,start=1,step=1), that way round so that start can be omitted and default to 1 (ditto step). tagstart() wants a length, though you could use 'z'-'a'+1 in place of the 26.
In Phix there is really not much difference between 1..26 and 'a'..'z', and none at all between 'a'..'z' and 97..122.

Output:
"abcdefghijklmnopqrstuvwxyz"
"abcdefghijklmnopqrstuvwxyz"
"abcdefghijklmnopqrstuvwxyz"

Phixmonti 

0 tolist
'a' 'z' 2 tolist
for
    tochar 0 put
endfor
print

Simplest 

include ..\Utilitys.pmt
( 'a' 'z' ) for tochar print endfor

PHP 

<?php
$lower = range('a', 'z');
var_dump($lower);
?>

Picat 

main =>
  Alpha1 = (0'a..0'z).map(chr),
  println(Alpha1),
  Alpha2 = [chr(I) : I in 97..122],
  println(Alpha2).
Output:
abcdefghijklmnopqrstuvwxyz
abcdefghijklmnopqrstuvwxyz


PicoLisp 

(mapcar char (range (char "a") (char "z")))

PL/I 

gen: procedure options (main);  /* 7 April 2014. */
   declare 1 ascii union,
             2 letters (26) character (1),
             2 iletters(26) unsigned fixed binary (8),
           letter character(1);
   declare i fixed binary;

   letters(1), letter = lowercase('A');
 
   do i = 2 to 26;
      iletters(i) = iletters(i-1) + 1;    
   end;
   put edit (letters) (a);

end gen;

Output: 

abcdefghijklmnopqrstuvwxyz

Alternative, using library: 

   /* Accessing library lower-case ASCII (PC only). */

   letter = lowercase('A');
   i = index(collate(), letter);
   put skip list (substr(collate, i, 26));

Output: 

abcdefghijklmnopqrstuvwxyz


PL/M 

100H: /* PRINT THE LOWERCASE LETTERS */

   /* CP/M BDOS SYSTEM CALL */
   BDOS: PROCEDURE( FN, ARG ); DECLARE FN BYTE, ARG ADDRESS; GOTO 5;END;
   /* CONSOLE OUTPUT ROUTINES */
   PR$STRING: PROCEDURE( S ); DECLARE S ADDRESS; CALL BDOS( 9, S ); END;

   /* TASK */
   DECLARE C BYTE, LC ( 27 )BYTE;
   DO C = 0 TO 25;
      LC( C ) = C + 32 + 'A';
   END;
   LC( LAST( LC ) ) = '$'; /* STRING TERMINATOR */
   CALL PR$STRING( .LC );

EOF
Output:
abcdefghijklmnopqrstuvwxyz

PL/SQL 

Declare
 sbAlphabet  varchar2(100);
Begin
  For nuI in 97..122 loop
      if sbAlphabet is null then
         sbAlphabet:=chr(nuI);
      Else
         sbAlphabet:=sbAlphabet||','||chr(nuI);
      End if;
  End loop;
  Dbms_Output.Put_Line(sbAlphabet);
End;

Output: 

PL/SQL block, executed in 0 ms

a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z

Total execution time 16 ms

Plain English 

To run:
Start up.
Generate the lowercase ASCII alphabet giving a string.
Write the string on the console.
Wait for the escape key.
Shut down.

To generate the lowercase ASCII alphabet giving a string:
Put the little-a byte into a letter.
Loop.
Append the letter to the string.
If the letter is the little-z byte, exit.
Add 1 to the letter.
Repeat.
Output:
abcdefghijklmnopqrstuvwxyz

PowerShell 

$asString = 97..122 | ForEach-Object -Begin {$asArray = @()} -Process {$asArray += [char]$_} -End {$asArray -join('')}
$asString
Output:
abcdefghijklmnopqrstuvwxyz

$asArray
Output:
a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
p
q
r
s
t
u
v
w
x
y
z

Alternative: 

-join [Char[]] (97..122)
Output:
abcdefghijklmnopqrstuvwxyz

Alternative as of PowerShell-v6.0.0rc: 

-join ('a'..'z')
Output:
abcdefghijklmnopqrstuvwxyz

Prolog

Works with SWI-Prolog 6.5.3 

a_to_z(From, To, L) :-
	maplist(atom_codes, [From, To], [[C_From], [C_To]]),
	bagof([C], between(C_From, C_To, C), L1),
	maplist(atom_codes,L, L1).

Output : 

 ?- a_to_z(a, z, L).
L = [a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z].

Python 

# From the standard library:
from string import ascii_lowercase

# Generation:
lower = [chr(i) for i in range(ord('a'), ord('z') + 1)]

Or, as a particular instance of a more general enumeration pattern:

Works with: Python version 3.7
'''Enumeration a-z'''

from inspect import signature
import enum


# TEST ----------------------------------------------------
def main():
    '''Testing particular instances of a general pattern:
    '''
    print(
        fTable(__doc__ + ':\n')(repr)(showList)(
            uncurry(enumFromTo)
        )([
            ('a', 'z'),
            ('α', 'ω'),
            ('א', 'ת'),
            (1, 10),
            (round((5**(1 / 2) - 1) / 2, 5), 5),
            ('🌱', '🍂')
        ])
    )


# GENERIC -------------------------------------------------

# enumFromTo :: Enum a => a -> a -> [a]
def enumFromTo(m):
    '''Enumeration of values [m..n]'''
    def go(x, y):
        t = type(m)
        i = fromEnum(x)
        d = 0 if t != float else (x - i)
        return list(map(
            lambda x: toEnum(t)(d + x),
            range(i, 1 + fromEnum(y))
        ) if int != t else range(x, 1 + y))
    return lambda n: go(m, n)


# fromEnum :: Enum a => a -> Int
def fromEnum(x):
    '''Index integer for enumerable value.'''
    Enum = enum.Enum
    return ord(x) if isinstance(x, str) else (
        x.value if isinstance(x, Enum) else int(x)
    )


# toEnum :: Type -> Int -> a
def toEnum(t):
    '''Enumerable value from index integer'''
    dct = {
        int: int,
        float: float,
        str: chr,
        bool: bool
    }
    return lambda x: dct[t](x) if t in dct else t(x)


# uncurry :: (a -> b -> c) -> ((a, b) -> c)
def uncurry(f):
    '''A function over a tuple, derived from
       a vanilla or curried function.
    '''
    if 1 < len(signature(f).parameters):
        return lambda xy: f(*xy)
    else:
        return lambda xy: f(xy[0])(xy[1])


# FORMATTING -------------------------------------------------

# fTable :: String -> (a -> String) ->
#                     (b -> String) -> (a -> b) -> [a] -> String
def fTable(s):
    '''Heading -> x display function -> fx display function ->
                     f -> xs -> tabular string.
    '''
    def go(xShow, fxShow, f, xs):
        ys = [xShow(x) for x in xs]
        w = max(map(len, ys))
        return s + '\n' + '\n'.join(map(
            lambda x, y: y.rjust(w, ' ') + ' -> ' + fxShow(f(x)),
            xs, ys
        ))
    return lambda xShow: lambda fxShow: lambda f: lambda xs: go(
        xShow, fxShow, f, xs
    )


# showList :: [a] -> String
def showList(xs):
    '''Stringification of a list.'''
    return '[' + ','.join(str(x) for x in xs) + ']'


# MAIN ---
if __name__ == '__main__':
    main()
Output:
Enumeration a-z:

  ('a', 'z') -> [a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z]
  ('α', 'ω') -> [α,β,γ,δ,ε,ζ,η,θ,ι,κ,λ,μ,ν,ξ,ο,π,ρ,ς,σ,τ,υ,φ,χ,ψ,ω]
  ('א', 'ת') -> [א,ב,ג,ד,ה,ו,ז,ח,ט,י,ך,כ,ל,ם,מ,ן,נ,ס,ע,ף,פ,ץ,צ,ק,ר,ש,ת]
     (1, 10) -> [1,2,3,4,5,6,7,8,9,10]
(0.61803, 5) -> [0.61803,1.61803,2.61803,3.61803,4.61803,5.61803]
  ('🌱', '🍂') -> [🌱,🌲,🌳,🌴,🌵,🌶,🌷,🌸,🌹,🌺,🌻,🌼,🌽,🌾,🌿,🍀,🍁,🍂]

Quackery

The word constant causes the preceding nest to be evaluated during compilation so alpha$ is a literal, not an expression computed during program evaluation. 

[ [] 26 times [ i^ char a + join ] ] constant is alpha$ ( --> $ )

alpha$ echo$
Output:
abcdefghijklmnopqrstuvwxyz

R 

# From constants built into R:
letters

# Or generate the same with:
sapply(97:122, intToUtf8)

Racket 

(define lowercase-letters (build-list 26 (lambda (x) (integer->char (+ x (char->integer #\a))))))

Raku

(formerly Perl 6)

Works with: rakudo version 2015-10-21
say my @letters = 'a'..'z';
  • 'a'..'z' is a range literal, it constructs an immutable Range object.
  • Assigning to an @ variable flattens it into an Array.

REXX

ASCII version

This version only works under ASCII machines   (where the values of the lowercase a through the lowercase z characters are contiguous (and consecutive). 

/* REXX ---------------------------------------------------------------
* 08.02.2014 Walter Pachl
*--------------------------------------------------------------------*/
say xrange('a','z')

Output: 

abcdefghijklmnopqrstuvwxyz

idiomatic version

This REXX version shows how to generate an indexable string of a similar sequence   as per the
lowercase ASCII alphabet   (or rather, the Latin [English] alphabet),   using a reliable style of coding  
(for both   ASCII   and   EBCDIC   systems).

This version also works on non-ASCII systems   (such as EBCDIC)   and isn't dependent on the
consecutiveness nature of any particular ASCII character subsequence.

Note that on an EBCDIC system,   there are   41   characters between (lowercase)   a   ──►   z    
(inclusive),   some of which don't have viewable/displayable glyphs. 

/*REXX program creates an indexable string of lowercase ASCII or EBCDIC characters: a─►z*/
$=                                               /*set lowercase letters list to  null. */
      do j=0  for 2**8;                _=d2c(j)  /*convert decimal  J  to a character.  */
      if datatype(_, 'L')  then $=$ || _         /*Is lowercase?  Then add it to $ list.*/
      end   /*j*/                                /* [↑]  add lowercase letters ──► $    */
say $                                            /*stick a fork in it,  we're all done. */

output 

abcdefghijklmnopqrstuvwxyz

Ring 

for i in 'a':'z'
    put i
next

RPL 

≪ ""
   "a" NUM "z" NUM FOR ascii 
      ascii CHR + NEXT
≫ EVAL
Output:
1: "abcdefghijklmnopqrstuvwxyz"

Ruby 

p ('a' .. 'z').to_a
p [*'a' .. 'z']

Rust 

fn main() {
    // An iterator over the lowercase alpha's
    let ascii_iter = (0..26)
        .map(|x| (x + b'a') as char);
 
    println!("{:?}", ascii_iter.collect::<Vec<char>>());
}
Output:
['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']

S-lang

Char_Type is just an integer-type so a "range array" can be easily created: 

variable alpha_ch = ['a':'z'], a;

If you need single-char strings, convert thusly: 

variable alpha_st = array_map(String_Type, &char, alpha_ch);

Let's take a peek: 

print(alpha_st[23]);
foreach a (alpha_ch)
  () = printf("%c ", a);
Output:
"x"
a b c d e f g h i j k l m n o p q r s t u v w x y z

Scala

Library: Scala
object Abc extends App {
  val lowAlpha = 'a' to 'z' //That's all
  // Now several tests
  assert(lowAlpha.toSeq == Seq('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
    'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'),
    "No complete lowercase alphabet.")
  assert(lowAlpha.size == 26, "No 26 characters in alphabet")
  assert(lowAlpha.start == 'a', "Character 'a' not first char! ???")
  assert(lowAlpha.head == 'a', "Character 'a' not heading! ???")
  assert(lowAlpha.head == lowAlpha(0), "Heading char is not first char.")
  assert(lowAlpha contains 'n', "Character n not present.")
  assert(lowAlpha.indexOf('n') == 13, "Character n not on the 14th position.")
  assert(lowAlpha.last == lowAlpha(25), "Expected character (z)on the last and 26th pos.")

  println(s"Successfully completed without errors. [within ${
    scala.compat.Platform.currentTime - executionStart
  } ms]")
}
Output:
Successfully completed without errors. [within 675 ms]

Process finished with exit code 0

Scheme

Works with: Gauche Scheme
(map integer->char (iota 26 (char->integer #\a)))
Output:
(#\a #\b #\c #\d #\e #\f #\g #\h #\i #\j #\k #\l #\m
 #\n #\o #\p #\q #\r #\s #\t #\u #\v #\w #\x #\y #\z)

Seed7 

$ include "seed7_05.s7i";

const proc: main is func
  local
    var string: lower is "";
    var char: ch is ' ';
  begin
    for ch range 'a' to 'z' do
      lower &:= ch;
    end for;
    writeln(lower);
  end func;
Output:
abcdefghijklmnopqrstuvwxyz

Sidef 

var arr = 'a'..'z';
say arr.join(' ');

Smalltalk 

| asciiLower |
asciiLower := String new.
97 to: 122 do: [:asciiCode |
    asciiLower := asciiLower , asciiCode asCharacter
].
^asciiLower

Snobol 

  &ALPHABET ('a' LEN(25)) . OUTPUT ;* Works in ASCII but not EBCDIC.

SPL 

> i, 1..26
  d = [i+96,0]
  a[i] = #.str(d)
<
'now A is an array of letters a..z

> i, 1..#.size(a,1)
  #.output(a[i],#.rs)
<
Output:
abcdefghijklmnopqrstuvwxyz

Standard ML 

val lowercase_letters = List.tabulate (26, fn x => chr (x + ord #"a"));

Stata 

// built-in: lowercase and uppercase letters
display c(alpha)
display c(ALPHA)

// generate a variable with the letters
clear
set obs 26
gen a=char(96+_n)

// or in Mata
mata
char(97..122)
end

SuperCollider

Previously, it was claimed that the method that maps ascii number to character is polymorphic on collections. However, that doesn't seem to be the case – at least not anymore in the newer version (3.10.2). A fix was added below the original code. 

(97..122).asAscii; // This example unfortunately throws an error 
                   // for me when running it on version 3.10.2

// Apparently, the message 'asAscii' cannot be understood by 
// an Array, so I used the message 'collect' to apply the function 
// enclosed in {} to each individual element of the Array, 
// passing them the message 'asAscii':

(97..122).collect({|asciiCode| asciiCode.asAscii}); 

// Instead of writing the ascii codes directly as numbers, 
// one could also pass the chars a and z the message 'ascii' to convert 
// them to ascii codes – perhaps making the code a bit clearer:

($a.ascii..$z.ascii).collect({|asciiCode| asciiCode.asAscii}); 

// both examples output [ a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z ]

Backwards: 

"abcdefghijklmnopqrstuvwxyz".ascii
// answers [ 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122 ]

Swift 

var letters = [Character]()

for i in 97...122 {
    let char = Character(UnicodeScalar(i))
    letters.append(char)
}

Tcl

The most common way of doing this in Tcl would be to use a simple literal; it's only 51 characters after all: 

set alpha {a b c d e f g h i j k l m n o p q r s t u v w x y z}

Though it could be done like this as well: 

set alpha [apply {{} {
    scan "az" "%c%c" from to
    for {set i $from} {$i <= $to} {incr i} {
        lappend l [format "%c" $i]
    }
    return $l
}}]

UNIX Shell

In bash or ksh93 with braceexpand set: 

lower=({a..z})

In zsh with braceccl set: 

lower=({a-z})

Either way, you can display the result like this: 

echo "${lower[@]}"
Output:
a b c d e f g h i j k l m n o p q r s t u v w x y z

Ursa

Creates a string named low containing the lower case ASCII alphabet. 

decl int i
decl string low
for (set i (ord "a")) (< i (+ (ord "z") 1)) (inc i)
        set low (+ low (chr i))
end for
out low endl console

VBA

Works with: VBA version 6.5
Works with: VBA version 7.1
Works with: Visual Basic version 6
Option Explicit

Sub Main_Lower_Case_Ascii_Alphabet()
Dim Alpha() As String

    Alpha = Alphabet(97, 122)
    Debug.Print Join(Alpha, ", ")
End Sub

Function Alphabet(FirstAscii As Byte, LastAscii As Byte) As String()
Dim strarrTemp() As String, i&

    ReDim strarrTemp(0 To LastAscii - FirstAscii)
    For i = FirstAscii To LastAscii
        strarrTemp(i - FirstAscii) = Chr(i)
    Next
    Alphabet = strarrTemp
    Erase strarrTemp
End Function
Output:
a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z

VBScript 

Function ASCII_Sequence(range)
	arr = Split(range,"..")
	For i = Asc(arr(0)) To Asc(arr(1))
		ASCII_Sequence = ASCII_Sequence & Chr(i) & " "
	Next
End Function

WScript.StdOut.Write ASCII_Sequence(WScript.Arguments(0))
WScript.StdOut.WriteLine
Output:
C:\>cscript /nologo ascii_sequence.vbs a..z
a b c d e f g h i j k l m n o p q r s t u v w x y z

C:\>cscript /nologo ascii_sequence.vbs A..F
A B C D E F

Verilog 

module main;
  integer i;
  
  initial begin
    for(i = 97; i <= 122; i=i+1)
    begin
      $write("%c ",i);
    end
      $finish ;
    end
endmodule
Output:
a b c d e f g h i j k l m n o p q r s t u v w x y z


Vim Script 

let lower = []
for c in range(0, 25)
   let lower += [nr2char(c + char2nr("a"))]
endfor

or: 

echo map(range(char2nr('a'), char2nr('z')), 'nr2char(v:val)')

Visual Basic

Works with: Visual Basic version 6

The #VBA example works in VB6 as well, without any change.

Visual Basic .NET

Works with: Visual Basic .NET version 9.0+

Used Asc(Char) [returns Integer value of Char passed] and Chr(Integer) [returns Char value of Integer passed] functions.
String.Join() is used to print the list, converted to array, without looping through it. 

Module LowerASCII

    Sub Main()
        Dim alphabets As New List(Of Char)
        For i As Integer = Asc("a") To Asc("z")
            alphabets.Add(Chr(i))
        Next
        Console.WriteLine(String.Join("", alphabets.ToArray))
    End Sub

End Module
Output:
abcdefghijklmnopqrstuvwxyz

V (Vlang) 

fn loweralpha() string {
    mut p := []u8{len: 26}
    for i in 97..123 {
        p[i-97] = u8(i)
    }
    return p.bytestr()
}

WebAssembly 

(module $lowercase

  (import "wasi_unstable" "fd_write"
    (func $fd_write (param i32 i32 i32 i32) (result i32))
  )

  (memory 1)
  (export "memory" (memory 0))

  (func $main (export "_start")
    (local $i i32)
    
    (i32.store (i32.const 0) (i32.const 8))   ;; offset to start of string
    (i32.store (i32.const 4) (i32.const 27))  ;; string length

    (set_local $i (i32.const 0))    
    (loop
      ;; mem[i+8] = i+97
      (i32.store (i32.add (get_local $i) (i32.const 8)) (i32.add (get_local $i) (i32.const 97)))
      ;; i = i+1
      (set_local $i (i32.add (get_local $i) (i32.const 1)))
      ;; if i < 26 then loop
      (br_if 0 (i32.lt_s (get_local $i) (i32.const 26)))
    )
    ;; append a newline
    (i32.store (i32.add (get_local $i) (i32.const 8)) (i32.const 10))

    ;; write to stdout
    (call $fd_write
      (i32.const 1)  ;; output stream to write to (1 == stdout)
      (i32.const 0)  ;; memory location containing string offset and length
      (i32.const 1)  ;; number of strings to write
      (i32.const 40) ;; location in memory to write number of bytes written
    )
    drop 
  )
)
Output:
abcdefghijklmnopqrstuvwxyz


Wren 

var alpha = []
for (c in 97..122) alpha.add(String.fromByte(c))
System.print(alpha.join())
Output:
abcdefghijklmnopqrstuvwxyz

x86-64 Assembly

NASM Syntax

; compile with:
; nasm -f elf64 alpha.asm -o alpha.o
; ld -z noexecstack -no-pie -s alpha.o -o alpha

global _start

section .text
_start:
    xor  rax,    rax
  .loop:
    mov  dil,    'a'                ;Our character
    add  dil,    al                 ;add number in rax/al
    mov  byte[alphabet + rax], dil  ;store character to memory
    inc  rax                        ;increment rax
    cmp  rax,    26                 ;is rax less than 26?
    jl   .loop                      ;yes? jump to .loop
  .print:
    mov  byte[alphabet + rax], 0x0a ;Make the last character an lf.
    mov  rax,    1                  ;write to
    mov  rdi,    1                  ;stdout
    mov  rsi,    alphabet           ;pointer to string
    mov  rdx,    27                 ;the number of characters
    syscall                         ;print it!
  .exit:
    mov  rax,    60                 ;exit
    xor  rdi,    rdi                ;exit code zero
    syscall

section .bss
alphabet: resb 27
Output:
$ ./alpha
abcdefghijklmnopqrstuvwxyz

fasm syntax

format ELF64 executable 3
entry begin

segment executable readable
begin:
    mov rcx, 26
    mov rdi, alphabet
    mov rax, 'a'
 .loop0:
    stosb
    inc rax
    loop .loop0
    mov byte[alphabet + 26], 0x0a
 .print0:
    mov rax, 1
    mov rdi, 1
    mov rsi, alphabet
    mov rdx, 27
    syscall
 .end:
    mov rax, 60
    xor rdi, rdi
    syscall

segment readable writeable
alphabet: rb 27
Output:
~/fasm$ fasm lower.asm lower
flat assembler  version 1.73.30  (16384 kilobytes memory)
3 passes, 252 bytes.
~/fasm$ chmod 755 lower
~/fasm$ ./lower
abcdefghijklmnopqrstuvwxyz
~/fasm$

xEec 

h$` h$` >0_0 t h$y ms p h? jn00_0 p r h#1 ma t jn0_0 >00_0 p p r p

XLISP 

(defun ascii-lower ()
    (defun add-chars (x y s)
        (if (<= x y)
            (add-chars (+ x 1) y (string-append s (string (integer->char x))))
            s))
    (add-chars 97 122 ""))

XPL0 

char I, A(26);
for I:= 0 to 26-1 do A(I):= I+^a

Z80 Assembly 

	org &8000
	ld a,'a'               ;data
	ld b,26                ;loop counter
	ld hl,Alphabet         ;destination
loop:
	ld (hl),a              ;store "a" into ram
	inc a                  ;next letter
	inc hl                 ;next storage byte
	djnz loop              ;repeat until 26 letters were stored.
	
	call Monitor_MemDump   ;hexdumps the specified address and bytecount to screen - created by Keith S. of Chibiakumas
	byte 32                ;number of bytes to display
	word Alphabet          ;address to dump from

	ret                    ;return to basic

Alphabet:
       ds 26,0                 ;reserve 26 bytes of ram, init all to zero.
Output:
8013:
61 62 63 64 65 66 67 68 abcdefgh
69 6A 6B 6C 6D 6E 6F 70 ijklmnop
71 72 73 74 75 76 77 78 qrstuvwx
79 7A 00 00 00 00 00 00 yz


zkl 

["a".."z"]  // lasy list
["a".."z"].walk() //-->L("a","b","c","d","e",...
"a".toAsc().pump(26,List,"toChar")  // another way to create the list
"a".toAsc().pump(26,String,"toChar")  // create a string
   //-->"abcdefghijklmnopqrstuvwxyz"
Utils.Helpers.lowerLetters  // string const

Zig 

const std = @import("std");

pub fn main() !void {
    const cnt_lower = 26;
    var lower: [cnt_lower]u8 = undefined;
    comptime var i = 0;
    inline while (i < cnt_lower) : (i += 1)
        lower[i] = i + 'a';

    const stdout_wr = std.io.getStdOut().writer();
    for (lower) |l|
        try stdout_wr.print("{c} ", .{l});
    try stdout_wr.writeByte('\n');
}
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