Remove vowels from a string: Difference between revisions
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Input : Wren Programming Language
Output : Wrn Prgrmmng Lngg
</pre>
=={{header|XBS}}==
<lang xbs>func RemoveVowels(x:string):string{
set Vowels:array="aeiou"::split();
set nx:string="";
for(i=0;?x-1;1){
set c = x::at(i);
if (!Vowels::has(c)){
nx+=x::at(i);
}
del c;
}
del Vowels;
send nx;
}
log(RemoveVowels("Hello, world!"));</lang>
{{out}}
<pre>
Hll, wrld!
</pre>
|
Revision as of 03:36, 2 September 2021
Remove vowels from a string
- Metrics
- Counting
- Word frequency
- Letter frequency
- Jewels and stones
- I before E except after C
- Bioinformatics/base count
- Count occurrences of a substring
- Count how many vowels and consonants occur in a string
- Remove/replace
- XXXX redacted
- Conjugate a Latin verb
- Remove vowels from a string
- String interpolation (included)
- Strip block comments
- Strip comments from a string
- Strip a set of characters from a string
- Strip whitespace from a string -- top and tail
- Strip control codes and extended characters from a string
- Anagrams/Derangements/shuffling
- Word wheel
- ABC problem
- Sattolo cycle
- Knuth shuffle
- Ordered words
- Superpermutation minimisation
- Textonyms (using a phone text pad)
- Anagrams
- Anagrams/Deranged anagrams
- Permutations/Derangements
- Find/Search/Determine
- ABC words
- Odd words
- Word ladder
- Semordnilap
- Word search
- Wordiff (game)
- String matching
- Tea cup rim text
- Alternade words
- Changeable words
- State name puzzle
- String comparison
- Unique characters
- Unique characters in each string
- Extract file extension
- Levenshtein distance
- Palindrome detection
- Common list elements
- Longest common suffix
- Longest common prefix
- Compare a list of strings
- Longest common substring
- Find common directory path
- Words from neighbour ones
- Change e letters to i in words
- Non-continuous subsequences
- Longest common subsequence
- Longest palindromic substrings
- Longest increasing subsequence
- Words containing "the" substring
- Sum of the digits of n is substring of n
- Determine if a string is numeric
- Determine if a string is collapsible
- Determine if a string is squeezable
- Determine if a string has all unique characters
- Determine if a string has all the same characters
- Longest substrings without repeating characters
- Find words which contains all the vowels
- Find words which contain the most consonants
- Find words which contains more than 3 vowels
- Find words whose first and last three letters are equal
- Find words with alternating vowels and consonants
- Formatting
- Substring
- Rep-string
- Word wrap
- String case
- Align columns
- Literals/String
- Repeat a string
- Brace expansion
- Brace expansion using ranges
- Reverse a string
- Phrase reversals
- Comma quibbling
- Special characters
- String concatenation
- Substring/Top and tail
- Commatizing numbers
- Reverse words in a string
- Suffixation of decimal numbers
- Long literals, with continuations
- Numerical and alphabetical suffixes
- Abbreviations, easy
- Abbreviations, simple
- Abbreviations, automatic
- Song lyrics/poems/Mad Libs/phrases
- Mad Libs
- Magic 8-ball
- 99 bottles of beer
- The Name Game (a song)
- The Old lady swallowed a fly
- The Twelve Days of Christmas
- Tokenize
- Text between
- Tokenize a string
- Word break problem
- Tokenize a string with escaping
- Split a character string based on change of character
- Sequences
11l
<lang 11l>F exceptGlyphs(exclusions, s)
R s.filter(c -> c !C @exclusions).join(‘’)
V txt = ‘
Rosetta Code is a programming chrestomathy site. The idea is to present solutions to the same task in as many different languages as possible, to demonstrate how languages are similar and different, and to aid a person with a grounding in one approach to a problem in learning another.’
print(exceptGlyphs(‘eau’, txt))</lang>
- Output:
Rostt Cod is progrmming chrstomthy sit. Th id is to prsnt soltions to th sm tsk in s mny diffrnt lnggs s possibl, to dmonstrt how lnggs r similr nd diffrnt, nd to id prson with gronding in on pproch to problm in lrning nothr.
8080 Assembly
<lang 8080asm> org 100h jmp demo ;;; Remove the vowels from the $-terminated string at [DE] dvwl: push d ; Keep output pointer on stack vwllp: ldax d ; Get current byte inx d ; Advance input pointer pop b ; Store at output pointer stax b cpi '$' ; Reached the end? rz ; If so, stop push b ; Put output pointer back on stack lxi h,vwls ; Check against each vowel ori 32 ; Make lowercase mvi b,5 ; 5 vowels vchk: cmp m ; Equal to current vowel? jz vwllp ; Then overwrite with next character inx h ; Check next vowel dcr b ; Any vowels left? jnz vchk pop b ; Not a vowel, advance output pointer inx b push b jmp vwllp vwls: db 'aeiou' ; Vowels ;;; Use the routine to remove vowels from a string demo: lxi d,string call dvwl ; Remove vowels lxi d,string mvi c,9 ; Print using CP/M jmp 5 string: db 'THE QUICK BROWN FOX jumps over the lazy dog$'</lang>
- Output:
TH QCK BRWN FX jmps vr th lzy dg
Ada
<lang Ada>with Ada.Text_IO; use Ada.Text_IO; with Ada.Strings.Unbounded; use Ada.Strings.Unbounded;
procedure Main is
subtype Vowel is Character with Static_Predicate => Vowel in 'A' | 'E' | 'I' | 'O' | 'U' | 'a' | 'e' | 'i' | 'o' | 'u';
function Remove_Vowels (S : in String) return String is Temp : Unbounded_String; begin for C of S loop if C not in Vowel then Append (Source => Temp, New_Item => C); end if; end loop; return To_String (Temp); end Remove_Vowels;
S1 : String := "The Quick Brown Fox Jumped Over the Lazy Dog's Back"; S2 : String := "DON'T SCREAM AT ME!!"; NV1 : String := Remove_Vowels (S1); NV2 : String := Remove_Vowels (S2);
begin
Put_Line (S1); Put_Line (NV1); New_Line; Put_Line (S2); Put_Line (NV2);
end Main; </lang>
- Output:
The Quick Brown Fox Jumped Over the Lazy Dog's Back Th Qck Brwn Fx Jmpd vr th Lzy Dg's Bck DON'T SCREAM AT ME!! DN'T SCRM T M!!
ALGOL 68
<lang algol68>BEGIN
# returns s with the vowels removed # OP DEVOWEL = ( STRING s )STRING: BEGIN [ LWB s : UPB s ]CHAR result; INT r pos := LWB result - 1; FOR s pos FROM LWB s TO UPB s DO IF NOT char in string( s[ s pos ], NIL, "aeiouAEIOU" ) THEN # have a non-vowel - add it to the output # r pos +:= 1; result[ r pos ] := s[ s pos ] FI OD; result[ LWB s : r pos ] END # DEVOWEL # ; # tests the DEVOWEL operator # PROC test devowel = ( STRING s )VOID: print( ( "<", s, "> -> <", DEVOWEL s, ">", newline ) ); # some test cases # test devowel( "" ); test devowel( "aAeEiIoOuU" ); test devowel( "bcdfghjklmnprstvwxyz" ); test devowel( "abcdefghijklmnoprstuvwxyz" ); test devowel( "Algol 68 Programming Language" )
END</lang>
- Output:
<> -> <> <aAeEiIoOuU> -> <> <bcdfghjklmnprstvwxyz> -> <bcdfghjklmnprstvwxyz> <abcdefghijklmnoprstuvwxyz> -> <bcdfghjklmnprstvwxyz> <Algol 68 Programming Language> -> <lgl 68 Prgrmmng Lngg>
APL
<lang APL>devowel ← ~∘'AaEeIiOoUu'</lang>
- Output:
devowel 'THE QUICK BROWN FOX jumps over the lazy dog' TH QCK BRWN FX jmps vr th lzy dg
AppleScript
Functional
Removing three particular Anglo-Saxon vowels from a text.
AppleScript doesn't provide list comprehensions, and even use of regular expressions requires the study of a Foreign Function Interface to ObjC, which might be thought to defeat the goals of an entry-level scripting language.
We can at least use the universally available list monad (using a general concatMap as the bind operator here, and returning an empty list in place of any excluded glyph).
We can also improve productivity by using library functions whenever feasible.
<lang applescript>------- REMOVE A DEFINED SUBSET OF GLYPHS FROM A TEXT ------
-- exceptGlyphs :: String -> String -> Bool on exceptGlyphs(exclusions, s)
script go on |λ|(c) if exclusions contains c then {} else {c} end if end |λ| end script concatMap(go, s)
end exceptGlyphs
-- Or, in terms of a general filter function:
-- exceptGlyphs2 :: String -> String -> Bool on exceptGlyphs2(exclusions, s)
script p on |λ|(c) exclusions does not contain c end |λ| end script filter(p, s)
end exceptGlyphs2
TEST --------------------------
on run
set txt to unlines({¬ "Rosetta Code is a programming chrestomathy site. ", ¬ "The idea is to present solutions to the same ", ¬ "task in as many different languages as possible, ", ¬ "to demonstrate how languages are similar and ", ¬ "different, and to aid a person with a grounding ", ¬ "in one approach to a problem in learning another."}) exceptGlyphs("eau", txt)
end run
LIBRARY FUNCTIONS --------------------
-- concatMap :: (a -> [b]) -> [a] -> [b] on concatMap(f, xs)
set lng to length of xs set acc to {} tell mReturn(f) repeat with i from 1 to lng set acc to acc & (|λ|(item i of xs, i, xs)) end repeat end tell if {text, string} contains class of xs then acc as text else acc end if
end concatMap
-- filter :: (a -> Bool) -> [a] -> [a]
on filter(p, xs)
tell mReturn(p) set lst to {} set lng to length of xs repeat with i from 1 to lng set v to item i of xs if |λ|(v, i, xs) then set end of lst to v end repeat if {text, string} contains class of xs then lst as text else lst end if end tell
end filter
-- 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
-- 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</lang>
- Output:
Rostt Cod is progrmming chrstomthy sit. Th id is to prsnt soltions to th sm tsk in s mny diffrnt lnggs s possibl, to dmonstrt how lnggs r similr nd diffrnt, nd to id prson with gronding in on pproch to problm in lrning nothr.
Idiomatic
As has been noted on the Discussion page, this is necessarily a parochial task which depends on the natural language involved being written with vowels and consonants and on what constitutes a vowel in its orthography. w and y are vowels in Welsh, but consonants in English, although y is often used as a vowel in English too, as it is in other languages. The code below demonstrates how AppleScript might remove the five English vowels and their diacritical forms from a Latinate text. AppleScript can be made to "ignore" diacriticals and case in string comparisons, but not to ignore ligatures or other variations which aren't strictly speaking diacriticals, such as ø. These would need to be included in the vowel list explicitly.
<lang applescript>-- Bog-standard AppleScript global-search-and-replace handler.
-- searchText can be either a single string or a list of strings to be replaced with replacementText. on replace(mainText, searchText, replacementText)
set astid to AppleScript's text item delimiters set AppleScript's text item delimiters to searchText set textItems to mainText's text items set AppleScript's text item delimiters to replacementText set editedText to textItems as text set AppleScript's text item delimiters to astid return editedText
end replace
-- Demo: set txt to "The quick brown fox jumps over the lazy dog L'œuvre d'un élève van Dijk \"The Death of Åse\" São Paulo Győr Malmö Mjøsa Jiří Bělohlávek conducts Martinů Po co pan tak brzęczy w gąszczu? Mahādeva"
ignoring diacriticals and case
set devowelledText to replace(txt, {"a", "e", "i", "o", "u"}, "")
end ignoring return devowelledText</lang>
- Output:
<lang AppleScript>"Th qck brwn fx jmps vr th lzy dg L'œvr d'n lv vn Dijk \"Th Dth f s\" S Pl Gyr Mlm Mjøs Jř Blhlvk cndcts Mrtn P c pn tk brzczy w gszcz? Mhdv"</lang>
Arturo
<lang rebol>str: "Remove vowels from a string"
print str -- split "aeiouAEIOU"</lang>
- Output:
Rmv vwls frm strng
AutoHotkey
<lang AutoHotkey>str := "The quick brown fox jumps over the lazy dog" for i, v in StrSplit("aeiou") str := StrReplace(str, v) MsgBox % str</lang>
- Output:
Th qck brwn fx jmps vr th lzy dg
RegEx Version
<lang AutoHotkey>str := "The quick brown fox jumps over the lazy dog" MsgBox % str := RegExReplace(str, "i)[aeiou]")</lang>
- Output:
Th qck brwn fx jmps vr th lzy dg
AWK
<lang AWK>
- syntax: GAWK -f REMOVE_VOWELS_FROM_A_STRING.AWK
BEGIN {
IGNORECASE = 1 arr[++n] = "The AWK Programming Language" arr[++n] = "The quick brown fox jumps over the lazy dog" for (i=1; i<=n; i++) { str = arr[i] printf("old: %s\n",str) gsub(/[aeiou]/,"",str) printf("new: %s\n\n",str) } exit(0)
} </lang>
- Output:
old: The AWK Programming Language new: Th WK Prgrmmng Lngg old: The quick brown fox jumps over the lazy dog new: Th qck brwn fx jmps vr th lzy dg
BCPL
<lang bcpl>get "libhdr"
let vowel(c) = valof $( c := c | 32
resultis c='a' | c='e' | c='i' | c='o' | c='u'
$)
let devowel(s) = valof $( let i = 1
while i <= s%0 $( test vowel(s%i) $( for j=i+1 to s%0 do s%(j-1) := s%j s%0 := s%0 - 1 $) or i := i + 1 $) resultis s
$)
let start() be
writes(devowel("THE QUICK BROWN FOX jumps over the lazy dog.*N"))</lang>
- Output:
TH QCK BRWN FX jmps vr th lzy dg.
C
<lang c>#include <stdio.h>
void print_no_vowels(const char *s) {
for (; *s != 0; s++) { switch (*s) { case 'A': case 'E': case 'I': case 'O': case 'U': case 'a': case 'e': case 'i': case 'o': case 'u': break; default: putchar(*s); break; } }
}
void test(const char *const s) {
printf("Input : %s\n", s);
printf("Output : "); print_no_vowels(s); printf("\n");
}
int main() {
test("C Programming Language"); return 0;
}</lang>
- Output:
Input : C Programming Language Output : C Prgrmmng Lngg
C#
<lang csharp>static string remove_vowels(string value) {
var stripped = from c in value.ToCharArray() where !"aeiouAEIOU".Contains(c) select c;
return new string(stripped.ToArray());
}
static void test(string value) {
Console.WriteLine("Input: " + value); Console.WriteLine("Output: " + remove_vowels(value));
}
static void Main(string[] args) {
test("CSharp Programming Language");
} </lang>
- Output:
Input: CSharp Programming Language Output: CShrp Prgrmmng Lngg
C++
<lang cpp>#include <algorithm>
- include <iostream>
class print_no_vowels { private:
const std::string &str;
public:
print_no_vowels(const std::string &s) : str(s) {} friend std::ostream &operator<<(std::ostream &, print_no_vowels);
};
std::ostream &operator<<(std::ostream &os, print_no_vowels pnv) {
auto it = pnv.str.cbegin(); auto end = pnv.str.cend(); std::for_each( it, end, [&os](char c) { switch (c) { case 'A': case 'E': case 'I': case 'O': case 'U': case 'a': case 'e': case 'i': case 'o': case 'u': break; default: os << c; break; } } ); return os;
}
void test(const std::string &s) {
std::cout << "Input : " << s << '\n'; std::cout << "Output : " << print_no_vowels(s) << '\n';
}
int main() {
test("C++ Programming Language"); return 0;
}</lang>
- Output:
Input : C++ Programming Language Output : C++ Prgrmmng Lngg
Common Lisp
<lang lisp>(defun vowelp (c &key (vowels "aeiou"))
(and (characterp c) (characterp (find c vowels :test #'char-equal))))
(defun remove-vowels (s)
(remove-if #'vowelp s))</lang>
Cowgol
<lang cowgol>include "cowgol.coh"; include "strings.coh";
- Remove the vowels from a string in place
sub Devowel(str: [uint8]) is
var out := str; loop var ch := [str]; str := @next str; [out] := ch; if ch == 0 then break; end if; ch := ch | 32; if (ch != 'a') and (ch != 'e') and (ch != 'i') and (ch != 'o') and (ch != 'u') then out := @next out; end if; end loop;
end sub;
var str := "THE QUICK BROWN FOX jumps over the lazy dog.\n";
var buf: uint8[256];
CopyString(str, &buf[0]); # make a copy of the string into writeable memory Devowel(&buf[0]); # remove the vowels print(&buf[0]); # print the result </lang>
- Output:
TH QCK BRWN FX jmps vr th lzy dg.
D
<lang d>import std.stdio;
void print_no_vowels(string s) {
foreach (c; s) { switch (c) { case 'A', 'E', 'I', 'O', 'U': case 'a', 'e', 'i', 'o', 'u': break; default: write(c); } } writeln;
}
void main() {
print_no_vowels("D Programming Language");
}</lang>
- Output:
D Prgrmmng Lngg
Delphi
<lang Delphi> program Remove_vowels_from_a_string;
{$APPTYPE CONSOLE}
{$R *.res}
uses
System.SysUtils;
function RemoveVowels(const s: string): string; const
VOWELS =['a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'];
var
c: char;
begin
Result := ; for c in s do begin if not (c in VOWELS) then Result := Result + c; end;
end;
const
TEST = 'The quick brown fox jumps over the lazy dog';
begin
Writeln('Before: ', TEST); Writeln('After: ', RemoveVowels(TEST)); Readln;
end.
</lang>
- Output:
Before: The quick brown fox jumps over the lazy dog After: Th qck brwn fx jmps vr th lzy dg
F#
<lang fsharp> let stripVowels n=let g=set['a';'e';'i';'o';'u';'A';'E';'I';'O';'U'] in n|>Seq.filter(fun n->not(g.Contains n))|>Array.ofSeq|>System.String printfn "%s" (stripVowels "Nigel Galloway") </lang>
- Output:
"Ngl Gllwy"
Factor
<lang factor>USING: formatting kernel sets ;
- without-vowels ( str -- new-str ) "aeiouAEIOU" without ;
"Factor Programming Language" dup without-vowels " Input string: %s\nWithout vowels: %s\n" printf</lang>
- Output:
Input string: Factor Programming Language Without vowels: Fctr Prgrmmng Lngg
Fortran
<lang fortran> program remove_vowels
implicit none
character(len=*), parameter :: string1="The quick brown fox jumps over the lazy dog." character(len=*), parameter :: string2="Fortran programming language"
call print_no_vowels(string1) call print_no_vowels(string2)
contains
subroutine print_no_vowels(string) character(len=*), intent(in) :: string integer :: i
do i = 1, len(string) select case (string(i:i)) case('A','E','I','O','U','a','e','i','o','u') cycle case default write(*,'(A1)',advance="no") string(i:i) end select end do write(*,*) new_line('A') end subroutine print_no_vowels
end program remove_vowels </lang>
- Output:
Th qck brwn fx jmps vr th lzy dg. Frtrn prgrmmng lngg
FreeBASIC
<lang FreeBASIC>dim as string message = "If Peter Piper picked a pack of pickled peppers"+_
", how many pickled peppers did Peter Piper pick?"
dim as string outstr = "", c
for i as uinteger = 1 to len(message)
c=mid(message,i,1) select case c case "a", "e", "i", "o", "u", "A", "E", "I", "O", "U": continue for case else: outstr += c end select
next i
print outstr</lang>
Fōrmulæ
Fōrmulæ programs are not textual, visualization/edition of programs is done showing/manipulating structures but not text. Moreover, there can be multiple visual representations of the same program. Even though it is possible to have textual representation —i.e. XML, JSON— they are intended for storage and transfer purposes more than visualization and edition.
Programs in Fōrmulæ are created/edited online in its website, However they run on execution servers. By default remote servers are used, but they are limited in memory and processing power, since they are intended for demonstration and casual use. A local server can be downloaded and installed, it has no limitations (it runs in your own computer). Because of that, example programs can be fully visualized and edited, but some of them will not run if they require a moderate or heavy computation/memory resources, and no local server is being used.
In this page you can see the program(s) related to this task and their results.
Go
<lang go>package main
import (
"fmt" "strings"
)
func removeVowels(s string) string {
var sb strings.Builder vowels := "aeiouAEIOU" for _, c := range s { if !strings.ContainsAny(string(c), vowels) { sb.WriteRune(c) } } return sb.String()
}
func main() {
s := "Go Programming Language" fmt.Println("Input :", s) fmt.Println("Output :", removeVowels(s))
}</lang>
- Output:
Input : Go Programming Language Output : G Prgrmmng Lngg
Haskell
Removing three specific Anglo-Saxon vowels from a text, using a general method which can apply to any specific subset of glyphs.
<lang haskell>------ REMOVE A SPECIFIC SUBSET OF GLYPHS FROM A STRING ----
exceptGlyphs :: String -> String -> String exceptGlyphs = filter . flip notElem
TEST --------------------------
txt :: String txt =
"Rosetta Code is a programming chrestomathy site.\n\ \The idea is to present solutions to the same\n\ \task in as many different languages as possible,\n\ \to demonstrate how languages are similar and\n\ \different, and to aid a person with a grounding\n\ \in one approach to a problem in learning another."
main :: IO () main = putStrLn $ exceptGlyphs "eau" txt</lang>
or, in terms of filter: <lang haskell>exceptGlyphs :: String -> String -> String exceptGlyphs = filter . flip notElem</lang>
- Output:
Rostt Cod is progrmming chrstomthy sit. Th id is to prsnt soltions to th sm tsk in s mny diffrnt lnggs s possibl, to dmonstrt how lnggs r similr nd diffrnt, nd to id prson with gronding in on pproch to problm in lrning nothr.
Java
<lang java>public static String removeVowelse(String str){
String re = ""; char c; for(int x = 0; x<str.length(); x++){ c = str.charAt(x); if(!(c=='a'||c=='e'||c=='i'||c=='o'||c=='u')) re+=c; } return re;
}</lang>
JavaScript
Removing all instances of three particular vowels from a text, using approaches that are generalisable to the removal of any specified subset of glyphs.
( Pace Jamie Zawinski, some people, when confronted with a problem, think "I know, I'll use parser combinators." )
<lang javascript>(() => {
'use strict'
// Parser :: String -> Parser String const purgedText = exclusions => fmapP(concatMap(concat))( sepBy( some(noneOf(exclusions)) )( some(oneOf(exclusions)) ) );
// ----------------------- TEST ------------------------ const main = () => { const txt = ` Rosetta Code is a programming chrestomathy site. The idea is to present solutions to the same task in as many different languages as possible, to demonstrate how languages are similar and different, and to aid a person with a grounding in one approach to a problem in learning another.`
return fst(parse( purgedText('eau') )(txt)[0]); };
// ---------------- PARSER COMBINATORS -----------------
// Parser :: String -> [(a, String)] -> Parser a const Parser = f => // A function lifted into a Parser object. ({ type: 'Parser', parser: f });
// altP (<|>) :: Parser a -> Parser a -> Parser a const altP = p => // p, or q if p doesn't match. q => Parser(s => { const xs = p.parser(s); return 0 < xs.length ? ( xs ) : q.parser(s); });
// apP <*> :: Parser (a -> b) -> Parser a -> Parser b const apP = pf => // A new parser obtained by the application // of a Parser-wrapped function, // to a Parser-wrapped value. p => Parser( s => pf.parser(s).flatMap( vr => fmapP(vr[0])( p ).parser(vr[1]) ) );
// bindP (>>=) :: Parser a -> // (a -> Parser b) -> Parser b const bindP = p => // A new parser obtained by the application of // a function to a Parser-wrapped value. // The function must enrich its output, lifting it // into a new Parser. // Allows for the nesting of parsers. f => Parser( s => p.parser(s).flatMap( tpl => f(tpl[0]).parser(tpl[1]) ) );
// fmapP :: (a -> b) -> Parser a -> Parser b const fmapP = f => // A new parser derived by the structure-preserving // application of f to the value in p. p => Parser( s => p.parser(s).flatMap( vr => Tuple(f(vr[0]))(vr[1]) ) );
// liftA2P :: (a -> b -> c) -> // Parser a -> Parser b -> Parser c const liftA2P = op => // The binary function op, lifted // to a function over two parsers. p => apP(fmapP(op)(p));
// many :: Parser a -> Parser [a] const many = p => { // Zero or more instances of p. // Lifts a parser for a simple type of value // to a parser for a list of such values. const some_p = p => liftA2P( x => xs => [x].concat(xs) )(p)(many(p)); return Parser( s => ( 0 < s.length ? ( altP(some_p(p))(pureP([])) ) : pureP([]) ).parser(s) ); };
// noneOf :: String -> Parser Char const noneOf = s => // Any character not found in the // exclusion string. satisfy(c => !s.includes(c));
// oneOf :: [Char] -> Parser Char const oneOf = s => // One instance of any character found // the given string. satisfy(c => s.includes(c));
// parse :: Parser a -> String -> [(a, String)] const parse = p => // The result of parsing s with p. s => p.parser(s);
// pureP :: a -> Parser a const pureP = x => // The value x lifted, unchanged, // into the Parser monad. Parser(s => [Tuple(x)(s)]);
// satisfy :: (Char -> Bool) -> Parser Char const satisfy = test => // Any character for which the // given predicate returns true. Parser( s => 0 < s.length ? ( test(s[0]) ? [ Tuple(s[0])(s.slice(1)) ] : [] ) : [] );
// sepBy :: Parser a -> Parser b -> Parser [a] const sepBy = p => // Zero or more occurrences of p, as // separated by (discarded) instances of sep. sep => altP( sepBy1(p)(sep) )( pureP([]) );
// sepBy1 :: Parser a -> Parser b -> Parser [a] const sepBy1 = p => // One or more occurrences of p, as // separated by (discarded) instances of sep. sep => bindP( p )(x => bindP( many(bindP( sep )(_ => bindP( p )(pureP))))( xs => pureP([x].concat(xs))));
// some :: Parser a -> Parser [a] const some = p => { // One or more instances of p. // Lifts a parser for a simple type of value // to a parser for a list of such values. const many_p = p => altP(some(p))(pureP([])); return Parser( s => liftA2P( x => xs => [x].concat(xs) )(p)(many_p(p)).parser(s) ); };
// ----------------- GENERIC FUNCIONS ------------------
// Tuple (,) :: a -> b -> (a, b) const Tuple = a => b => ({ type: 'Tuple', '0': a, '1': b, length: 2 });
// concat :: a -> [a] // concat :: [String] -> String const concat = xs => ( ys => 0 < ys.length ? ( ys.every(Array.isArray) ? ( [] ) : ).concat(...ys) : ys )(xs);
// concatMap :: (a -> [b]) -> [a] -> [b] const concatMap = f => // Where (a -> [b]) returns an Array, this // is equivalent to .flatMap, which should be // used by default. // but if (a -> [b]) returns String rather than [Char], // the monoid unit is in place of [], and a // concatenated string is returned. xs => { const ys = list(xs).map(f); return 0 < ys.length ? ( ys.some(y => 'string' !== typeof y) ? ( [] ) : ).concat(...ys) : ys; };
// list :: StringOrArrayLike b => b -> [a] const list = xs => // xs itself, if it is an Array, // or an Array derived from xs. Array.isArray(xs) ? ( xs ) : Array.from(xs || []);
// map :: (a -> b) -> [a] -> [b] const map = f => // The list obtained by applying f // to each element of xs. // (The image of xs under f). xs => [...xs].map(f);
// fst :: (a, b) -> a const fst = tpl => // First member of a pair. tpl[0];
// main --- return main();
})();</lang>
- Output:
Rostt Cod is progrmming chrstomthy sit. Th id is to prsnt soltions to th sm tsk in s mny diffrnt lnggs s possibl, to dmonstrt how lnggs r similr nd diffrnt, nd to id prson with gronding in on pproch to problm in lrning nothr.
but a filter is all we need here:
<lang javascript>(() => {
'use strict';
// Parser :: String -> Parser String const purgedText = exclusions => s => [...s] .filter(c => !exclusions.includes(c)) .join();
// ---------------------- TEST ----------------------- const main = () => { const txt = ` Rosetta Code is a programming chrestomathy site. The idea is to present solutions to the same task in as many different languages as possible, to demonstrate how languages are similar and different, and to aid a person with a grounding in one approach to a problem in learning another.`;
return purgedText('eau')(txt); };
// main --- return main();
})();</lang>
- Output:
Rostt Cod is progrmming chrstomthy sit. Th id is to prsnt soltions to th sm tsk in s mny diffrnt lnggs s possibl, to dmonstrt how lnggs r similr nd diffrnt, nd to id prson with gronding in on pproch to problm in lrning nothr.
jq
Works with gojq, the Go implementation of jq <lang sh>
- !/bin/bash
vowels='AÀÁÂÃÄÅĀĂĄǺȀȂẠẢẤẦẨẪẬẮẰẲẴẶḀÆǼEȄȆḔḖḘḚḜẸẺẼẾỀỂỄỆĒĔĖĘĚÈÉÊËIȈȊḬḮỈỊĨĪĬĮİÌÍÎÏIJOŒØǾȌȎṌṎṐṒỌỎỐỒỔỖỘỚỜỞỠỢŌÒÓŎŐÔÕÖUŨŪŬŮŰŲÙÚÛÜȔȖṲṴṶṸṺỤỦỨỪỬỮỰ'
function input { cat<<'EOF' In this entry, we assume that the "vowels" of the particular texts of interest can be specified as a JSON string of letters. Furthermore, we take advantage of gsub's support for the "ignore case" option, "i", so that for vowels which have both upper and lower case forms, only one form need be included in the string. So for example, for unaccented English text we could use the invocation:
jq -Rr 'gsub("[aeiou]+"; ""; "i")' input.txt
The string of vowels can also be specified as an argument to jq, e.g. assuming a bash or bash-like scripting environment:
vowels='AÀÁÂÃÄÅĀĂĄǺȀȂẠẢẤẦẨẪẬẮẰẲẴẶḀÆǼEȄȆḔḖḘḚḜẸẺẼẾỀỂỄỆĒĔĖĘĚÈÉÊËIȈȊḬḮỈỊĨĪĬĮİÌÍÎÏIJOŒØǾȌȎṌṎṐṒỌỎỐỒỔỖỘỚỜỞỠỢŌÒÓŎŐÔÕÖUŨŪŬŮŰŲÙÚÛÜȔȖṲṴṶṸṺỤỦỨỪỬỮỰ' jq -Rr --arg v "$vowels" 'gsub("[\($v)]+"; ""; "i")' input.txt
Norwegian, Icelandic, German, Turkish, French, Spanish, English: Undervisningen skal være gratis, i det minste på de elementære og grunnleggende trinn. Skal hún veitt ókeypis, að minnsta kosti barnafræðsla og undirstöðummentu. Hochschulunterricht muß allen gleichermaßen entsprechend ihren Fähigkeiten offenstehen. Öğrenim hiç olmazsa ilk ve temel safhalarında parasızdır. İlk öğretim mecburidir. L'éducation doit être gratuite, au moins en ce qui concerne l'enseignement élémentaire et fondamental. La instrucción elemental será obligatoria. La instrucción técnica y profesional habrá de ser generalizada. Education shall be free, at least in the elementary and fundamental stages. EOF }
input | jq -Rr --arg v "$vowels" 'gsub("[\($v)]+"; ""; "i")' </lang>
- Output:
n ths ntry, w ssm tht th "vwls" f th prtclr txts f ntrst cn b spcfd s JSN strng f lttrs. Frthrmr, w tk dvntg f gsb's spprt fr th "gnr cs" ptn, "", s tht fr vwls whch hv bth ppr nd lwr cs frms, nly n frm nd b ncldd n th strng. S fr xmpl, fr nccntd nglsh txt w cld s th nvctn: jq -Rr 'gsb("[]+"; ""; "")' npt.txt Th strng f vwls cn ls b spcfd s n rgmnt t jq, .g. ssmng bsh r bsh-lk scrptng nvrnmnt: vwls='' jq -Rr --rg v "$vwls" 'gsb("[\($v)]+"; ""; "")' npt.txt Nrwgn, clndc, Grmn, Trksh, Frnch, Spnsh, nglsh: ndrvsnngn skl vr grts, dt mnst p d lmntr g grnnlggnd trnn. Skl hn vtt kyps, ð mnnst kst brnfrðsl g ndrstðmmnt. Hchschlntrrcht mß lln glchrmßn ntsprchnd hrn Fhgktn ffnsthn. ğrnm hç lmzs lk v tml sfhlrınd prsızdır. lk ğrtm mcbrdr. L'dctn dt tr grtt, mns n c q cncrn l'nsgnmnt lmntr t fndmntl. L nstrccn lmntl sr blgtr. L nstrccn tcnc y prfsnl hbr d sr gnrlzd. dctn shll b fr, t lst n th lmntry nd fndmntl stgs.
Julia
Unicode sensitive, using the Raku version example text. <lang julia>const ALLVOWELS = Dict(ch => 1 for ch in Vector{Char}("AÀÁÂÃÄÅĀĂĄǺȀȂẠẢẤẦẨẪẬẮẰẲẴẶḀÆǼEȄȆḔḖḘḚḜẸẺẼẾỀỂỄỆĒĔĖĘĚÈÉÊËIȈȊḬḮỈỊĨĪĬĮİÌÍÎÏIJOŒØǾȌȎṌṎṐṒỌỎỐỒỔỖỘỚỜỞỠỢŌÒÓŎŐÔÕÖUŨŪŬŮŰŲÙÚÛÜȔȖṲṴṶṸṺỤỦỨỪỬỮỰ")) const ALLVOWELSY = Dict(ch => 1 for ch in Vector{Char}("AÀÁÂÃÄÅĀĂĄǺȀȂẠẢẤẦẨẪẬẮẰẲẴẶḀÆǼEȄȆḔḖḘḚḜẸẺẼẾỀỂỄỆĒĔĖĘĚÈÉÊËIȈȊḬḮỈỊĨĪĬĮİÌÍÎÏIJOŒØǾȌȎṌṎṐṒỌỎỐỒỔỖỘỚỜỞỠỢŌÒÓŎŐÔÕÖUŨŪŬŮŰŲÙÚÛÜȔȖṲṴṶṸṺỤỦỨỪỬỮỰYẙỲỴỶỸŶŸÝ"))
isvowel(ch, yisavowel=false) = haskey(yisavowel ? ALLVOWELSY : ALLVOWELS, uppercase(ch))
const testtext = """
Norwegian, Icelandic, German, Turkish, French, Spanish, English: Undervisningen skal være gratis, i det minste på de elementære og grunnleggende trinn. Skal hún veitt ókeypis, að minnsta kosti barnafræðsla og undirstöðummentu. Hochschulunterricht muß allen gleichermaßen entsprechend ihren Fähigkeiten offenstehen. Öğrenim hiç olmazsa ilk ve temel safhalarında parasızdır. İlk öğretim mecburidir. L'éducation doit être gratuite, au moins en ce qui concerne l'enseignement élémentaire et fondamental. La instrucción elemental será obligatoria. La instrucción técnica y profesional habrá de ser generalizada. Education shall be free, at least in the elementary and fundamental stages."""
println("Removing vowels from:\n$testtext\n becomes:\n",
String(filter(!isvowel, Vector{Char}(testtext))))
</lang>
- Output:
Removing vowels from: Norwegian, Icelandic, German, Turkish, French, Spanish, English: Undervisningen skal være gratis, i det minste på de elementære og grunnleggende trinn. Skal hún veitt ókeypis, að minnsta kosti barnafræðsla og undirstöðummentu. Hochschulunterricht muß allen gleichermaßen entsprechend ihren Fähigkeiten offenstehen. Öğrenim hiç olmazsa ilk ve temel safhalarında parasızdır. İlk öğretim mecburidir. L'éducation doit être gratuite, au moins en ce qui concerne l'enseignement élémentaire et fondamental. La instrucción elemental será obligatoria. La instrucción técnica y profesional habrá de ser generalizada. Education shall be free, at least in the elementary and fundamental stages. becomes: Nrwgn, clndc, Grmn, Trksh, Frnch, Spnsh, nglsh: ndrvsnngn skl vr grts, dt mnst p d lmntr g grnnlggnd trnn. Skl hn vtt kyps, ð mnnst kst brnfrðsl g ndrstðmmnt. Hchschlntrrcht mß lln glchrmßn ntsprchnd hrn Fhgktn ffnsthn. ğrnm hç lmzs lk v tml sfhlrnd prszdr. lk ğrtm mcbrdr. L'dctn dt tr grtt, mns n c q cncrn l'nsgnmnt lmntr t fndmntl. L nstrccn lmntl sr blgtr. L nstrccn tcnc y prfsnl hbr d sr gnrlzd. dctn shll b fr, t lst n th lmntry nd fndmntl stgs.
Kotlin
<lang scala>fun removeVowels(s: String): String {
val re = StringBuilder() for (c in s) { if (c != 'A' && c != 'a' && c != 'E' && c != 'e' && c != 'I' && c != 'i' && c != 'O' && c != 'o' && c != 'U' && c != 'u') { re.append(c) } } return re.toString()
}
fun main() {
println(removeVowels("Kotlin Programming Language"))
}</lang>
- Output:
Ktln Prgrmmng Lngg
Lua
<lang lua>function removeVowels (inStr)
local outStr, letter = "" local vowels = "AEIUOaeiou" for pos = 1, #inStr do letter = inStr:sub(pos, pos) if vowels:find(letter) then -- This letter is a vowel else outStr = outStr .. letter end end return outStr
end
local testStr = "The quick brown fox jumps over the lazy dog" print(removeVowels(testStr))</lang>
- Output:
Th qck brwn fx jmps vr th lzy dg
MATLAB / Octave
<lang Matlab> function [result] = remove_vowels(text) % http://rosettacode.org/wiki/Remove_vowels_from_a_string
flag=zeros(size(text)); for c='AEIOUaeiou'
flag=flag|(text==c);
end result=text(~flag); end
remove_vowels('The AWK Programming Language') remove_vowels('The quick brown fox jumps over the lazy dog')
%!test %! assert(remove_vowels('The AWK Programming Language'),'Th WK Prgrmmng Lngg') %!test %! assert(remove_vowels('The quick brown fox jumps over the lazy dog'),'Th qck brwn fx jmps vr th lzy dg') </lang>
- Output:
ans = Th WK Prgrmmng Lngg ans = Th qck brwn fx jmps vr th lzy dg
Nim
<lang Nim>import strutils, sugar
const Vowels = {'a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'}
proc removeVowels(str: var string; vowels: set[char]) =
## Remove vowels from string "str". var start = 0 while true: let pos = str.find(vowels, start) if pos < 0: break str.delete(pos, pos) start = pos
const TestString = "The quick brown fox jumps over the lazy dog" echo TestString echo TestString.dup(removeVowels(Vowels))</lang>
- Output:
The quick brown fox jumps over the lazy dog Th qck brwn fx jmps vr th lzy dg
Perl
Inspired by the Raku entry. <lang perl>use strict; use warnings; use utf8; binmode STDOUT, ":utf8"; use Unicode::Normalize;
my $text = <<~'END';
Norwegian, Icelandic, German, Turkish, French, Spanish, English: Undervisningen skal være gratis, i det minste på de elementære og grunnleggende trinn. Skal hún veitt ókeypis, að minnsta kosti barnafræðsla og undirstöðummentu. Hochschulunterricht muß allen gleichermaßen entsprechend ihren Fähigkeiten offenstehen. Öğrenim hiç olmazsa ilk ve temel safhalarında parasızdır. İlk öğretim mecburidir. L'éducation doit être gratuite, au moins en ce qui concerne l'enseignement élémentaire et fondamental. La instrucción elemental será obligatoria. La instrucción técnica y profesional habrá de ser generalizada. Education shall be free, at least in the elementary and fundamental stages. END
my @vowels; chr($_) =~ /[aæeiıoœu]/i and push @vowels, chr($_) for 0x20 .. 0x1ff; print NFD($_) =~ /@{[join '|', @vowels]}/ ? ' ' : $_ for split /(\X)/, $text;</lang>
- Output:
N rw g n, c l nd c, G rm n, T rk sh, Fr nch, Sp n sh, ngl sh: nd rv sn ng n sk l v r gr t s, d t m nst p d l m nt r g gr nnl gg nd tr nn. Sk l h n v tt k yp s, ð m nnst k st b rn fr ðsl g nd rst ð mm nt . H chsch l nt rr cht m ß ll n gl ch rm ß n ntspr ch nd hr n F h gk t n ff nst h n. ğr n m h ç lm zs lk v t m l s fh l r nd p r s zd r. lk ğr t m m cb r d r. L' d c t n d t tr gr t t , m ns n c q c nc rn l' ns gn m nt l m nt r t f nd m nt l. L nstr cc n l m nt l s r bl g t r . L nstr cc n t cn c y pr f s n l h br d s r g n r l z d . d c t n sh ll b fr , t l st n th l m nt ry nd f nd m nt l st g s.
Phix
constant s = "Phix Programming Language" printf(1,"Input : %s\nOutput : %s\n",{s,filter(s,"out","aeiouAEIUO")})
- Output:
Input : Phix Programming Language Output : Phx Prgrmmng Lngg
If you want something a bit more like Julia/Raku, the following should work, but you have to provide your own vowel-set, or nick/merge from Julia/REXX
with javascript_semantics constant vowels = utf8_to_utf32("AEIOUIÖaeiouæáåäéêióöú"), s = """ Norwegian, Icelandic, German, Turkish, French, Spanish, English: Undervisningen skal være gratis, i det minste på de elementære og grunnleggende trinn. Skal hún veitt ókeypis, að minnsta kosti barnafræðsla og undirstöðummentu. Hochschulunterricht muß allen gleichermaßen entsprechend ihren Fähigkeiten offenstehen. Ögrenim hiç olmazsa ilk ve temel safhalarinda parasizdir. Ilk ögretim mecburidir. L'éducation doit être gratuite, au moins en ce qui concerne l'enseignement élémentaire et fondamental. La instrucción elemental será obligatoria. La instrucción técnica y profesional habrá de ser generalizada. Education shall be free, at least in the elementary and fundamental stages. """ function remove_vowels(sequence s) s = utf8_to_utf32(s) for i=length(s) to 1 by -1 do if find(s[i],vowels) then s[i] = ' ' end if -- if find(s[i],vowels) then s[i..i] = "" end if end for s = utf32_to_utf8(s) return s end function printf(1,"%s\n",remove_vowels(s))
(output deliberately not shown due to windows console effects, but it is the same as Raku, or Julia with the alternate find/replace line.)
Prolog
<lang Prolog>
- - system:set_prolog_flag(double_quotes,chars) .
- - [library(lists)] .
%! remove_vowels(INPUTz0,OUTPUTz0) % % `OUTPUTz0` is `INPUTz0` but without any vowels .
remove_vowels(INPUTz0,OUTPUTz0)
- -
prolog:phrase(remove_vowels(INPUTz0),OUTPUTz0) .
remove_vowels([]) --> [] .
remove_vowels([INPUT0|INPUTz0]) --> { vowel(INPUT0) } , ! , remove_vowels(INPUTz0) .
remove_vowels([INPUT0|INPUTz0]) --> ! , [INPUT0] , remove_vowels(INPUTz0) .
vowel(CHAR)
- -
lists:member(CHAR,"AEIOUaeiouüéâäàåçêëèïîìÄÅÉæÆôöòûùÿÖÜáíóúªºαΩ") . </lang>
- Output:
/* ?- remove_vowels("abcdef",Ys). Ys = [b, c, d, f]. ?- remove_vowels("",Ys). Ys = []. ?- remove_vowels("aeiou",Ys). Ys = []. ?- remove_vowels("bcdfg",Ys). Ys = [b, c, d, f, g]. ?- */
Python
Removing 3 particular Anglo-Saxon vowels from a string:
<lang python>Remove a defined subset of glyphs from a string
- exceptGlyphs :: String -> String -> String
def exceptGlyphs(exclusions):
A string from which all instances of a given set of glyphs have been removed. def go(s): return .join( c for c in s if c not in exclusions ) return go
- -------------------------- TEST --------------------------
- main :: IO ()
def main():
Test
txt = Rosetta Code is a programming chrestomathy site. The idea is to present solutions to the same task in as many different languages as possible, to demonstrate how languages are similar and different, and to aid a person with a grounding in one approach to a problem in learning another.
print( exceptGlyphs('eau')(txt) )
- MAIN ---
if __name__ == '__main__':
main()</lang>
- Output:
Rostt Cod is progrmming chrstomthy sit. Th id is to prsnt soltions to th sm tsk in s mny diffrnt lnggs s possibl, to dmonstrt how lnggs r similr nd diffrnt, nd to id prson with gronding in on pproch to problm in lrning nothr.
Quackery
<lang Quackery>[ 0 $ "AEIOUaeiou"
witheach [ bit | ] ] constant is vowels ( --> f )
[ $ "" swap
witheach [ dup bit vowels & 0 = iff join else drop ] ] is disemvowel ( $ --> $ )
$ '"Beautiful coquettes are quacks of love."' $ ' -- Francois De La Rochefoucauld' join disemvowel echo$</lang>
Output:
"Btfl cqtts r qcks f lv." -- Frncs D L Rchfcld
Raku
Not going to bother with 'y', it's too touchy feely (How many vowels are in the word my? why? any?) and subject to interpretation.
Otherwise, this should work for most Latinate languages.
Apropos of nothing; reminds me of one of my favorite Between the Lions performances: Sloppy Pop - Sometimes Y
Spec is 'Remove vowels from a string'; nothing about what they should be replaced with. I chose to replace them with spaces.
Strings from http://mylanguages.org/. No affiliation, but it's a nice resource. (note: these are not all the same sentence but are all from the same paragraph. They frankly were picked based on their vowel load.)
<lang perl6>my @vowels = (0x20 .. 0x2fff).map: { .chr if .chr.samemark('x') ~~ m:i/<[aæeiıoœu]>/ }
my $text = q:to/END/;
Norwegian, Icelandic, German, Turkish, French, Spanish, English: Undervisningen skal være gratis, i det minste på de elementære og grunnleggende trinn. Skal hún veitt ókeypis, að minnsta kosti barnafræðsla og undirstöðummentu. Hochschulunterricht muß allen gleichermaßen entsprechend ihren Fähigkeiten offenstehen. Öğrenim hiç olmazsa ilk ve temel safhalarında parasızdır. İlk öğretim mecburidir. L'éducation doit être gratuite, au moins en ce qui concerne l'enseignement élémentaire et fondamental. La instrucción elemental será obligatoria. La instrucción técnica y profesional habrá de ser generalizada. Education shall be free, at least in the elementary and fundamental stages. END
put $text.subst(/@vowels/, ' ', :g);</lang>
- Output:
N rw g n, c l nd c, G rm n, T rk sh, Fr nch, Sp n sh, ngl sh: nd rv sn ng n sk l v r gr t s, d t m nst p d l m nt r g gr nnl gg nd tr nn. Sk l h n v tt k yp s, ð m nnst k st b rn fr ðsl g nd rst ð mm nt . H chsch l nt rr cht m ß ll n gl ch rm ß n ntspr ch nd hr n F h gk t n ff nst h n. ğr n m h ç lm zs lk v t m l s fh l r nd p r s zd r. lk ğr t m m cb r d r. L' d c t n d t tr gr t t , m ns n c q c nc rn l' ns gn m nt l m nt r t f nd m nt l. L nstr cc n l m nt l s r bl g t r . L nstr cc n t cn c y pr f s n l h br d s r g n r l z d . d c t n sh ll b fr , t l st n th l m nt ry nd f nd m nt l st g s.
REXX
These two REXX versions remove the Latin (Roman) vowels and all those accented and Greek vowels that are supported in the 437 code page.
using the TRANSLATE BIF
This REXX version uses the translate BIF which works faster for longer strings as there is no character-by-character manipulation. <lang rexx>/*REXX program removes vowels (both lowercase and uppercase and accented) from a string.*/ parse arg x /*obtain optional argument from the CL.*/ if x= | x="," then x= 'REXX Programming Language' /*Not specified? Then use default*/ say ' input string: ' x vowels= 'AEIOUaeiou' || "üéâäàåçêëèïîìÄÅÉæÆôöòûùÿÖÜáíóúªºαΩ" /*Latin + accented + Greek*/ $= translate( xrange(), ., ' ') /*define a string of almost all chars. */ q= substr($, verify($, x), 1) /*find a character NOT in the X string.*/ y= translate(x, q, " ") /*trans. blanks in the string (for now)*/ y= space(translate(y, , vowels), 0) /*trans. vowels──►blanks, elide blanks.*/ y= translate(y, , q) /*trans the Q characters back to blanks*/ say 'output string: ' y /*stick a fork in it, we're all done. */</lang>
- output when using the default input:
input string: REXX Programming Language output string: RXX Prgrmmng Lngg
using character eliding
This REXX version uses a character-by-character manipulation and should be easier to understand. <lang rexx>/*REXX program removes vowels (both lowercase and uppercase and accented) from a string.*/ parse arg x /*obtain optional argument from the CL.*/ if x= | x="," then x= 'REXX Programming Language' /*Not specified? Then use default*/ say ' input string: ' x vowels= 'AEIOUaeiou' || "üéâäàåçêëèïîìÄÅÉæÆôöòûùÿÖÜáíóúªºαΩ" /*Latin + accented + Greek*/ x= . || x /*prefix string with a dummy character.*/
do j=length(x)-1 by -1 for length(x)-1 /*process the string from the back─end.*/ _= pos( substr(x, j, 1), vowels) /*is this particular character a vowel?*/ if _==0 then iterate /*if zero (not a vowel), then skip it.*/ x= left(x, j - 1) || substr(x, j + 1) /*elide the vowel just detected from X.*/ end /*j*/
x= substr(x, 2) /*elide the prefixed dummy character. */ say 'output string: ' x /*stick a fork in it, we're all done. */</lang>
- output is identical to the 1st REXX version.
Ring
<lang ring> load "stdlib.ring" str = "Ring Programming Language" see "Input : " + str + nl for n = 1 to len(str)
if isVowel(str[n]) str = substr(str,str[n],"") ok
next see "String without vowels: " + str + nl </lang>
- Output:
Input : Ring Programming Language String without vowels: Rng Prgrmmng Lngg
Ruby
<lang ruby> p "Remove vowels from a string".delete("aeiouAEIOU") # => "Rmv vwls frm strng" </lang>
Rust
<lang rust> fn remove_vowels(str: String) -> String {
let vowels = "aeiouAEIOU"; let mut devowelled_string = String::from("");
for i in str.chars() { if vowels.contains(i) { continue; } else { devowelled_string.push(i); } } return devowelled_string;
}
fn main() {
let intro = String::from("Ferris, the crab, is the unofficial mascot of the Rust Programming Language"); println!("{}", intro); println!("{}", remove_vowels(intro));
} </lang> Output :
Ferris, the crab, is the unofficial mascot of the Rust Programming Language Frrs, th crb, s th nffcl msct f th Rst Prgrmmng Lngg
Smalltalk
<lang smalltalk>in := 'The balloon above harsh waters of programming languages, is the mascot of Smalltalk'. out := in reject:[:ch | ch isVowel]. in printCR. out printCR.</lang>
- Output:
The balloon above harsh harsh waters of programming languages, is the mascot of Smalltalk Th blln bv hrsh wtrs f prgrmmng lnggs, s th msct f Smlltlk
As usual, there are many alternative ways to do this: <lang smalltalk>out := in reject:#isVowel. " cool: symbols understand value: "
out := in select:[:ch | ch isVowel not].
out := in reject:[:ch | 'aeiou' includes:ch asLowercase ].
out := in reject:[:ch | #( $a $e $i $o $u ) includes:ch asLowercase ].
out := in reject:[:ch | 'AaEeIiOoUu' includes:ch ].
out := String streamContents:[:s |
in do:[:ch | ch isVowel ifFalse:[ s nextPut:ch ] ]]
</lang>
Standard ML
<lang sml>fun isVowel c =
CharVector.exists (fn v => c = v) "AaEeIiOoUu"
val removeVowels =
String.translate (fn c => if isVowel c then "" else str c)
val str = "LOREM IPSUM dolor sit amet\n" val () = print str val () = print (removeVowels str)</lang>
- Output:
LOREM IPSUM dolor sit amet LRM PSM dlr st mt
Swift
<lang swift>func isVowel(_ char: Character) -> Bool {
switch (char) { case "a", "A", "e", "E", "i", "I", "o", "O", "u", "U": return true default: return false }
}
func removeVowels(string: String) -> String {
return string.filter{!isVowel($0)}
}
let str = "The Swift Programming Language" print(str) print(removeVowels(string: str))</lang>
- Output:
The Swift Programming Language Th Swft Prgrmmng Lngg
Visual Basic .NET
<lang vbnet>Imports System.Text
Module Module1
Function RemoveVowels(s As String) As String Dim sb As New StringBuilder For Each c In s Select Case c Case "A", "a" Case "E", "e" Case "I", "i" Case "O", "o" Case "U", "u" Exit Select Case Else sb.Append(c) End Select Next Return sb.ToString End Function
Sub Test(s As String) Console.WriteLine("Input : {0}", s) Console.WriteLine("Output : {0}", RemoveVowels(s)) End Sub
Sub Main() Test("Visual Basic .NET") End Sub
End Module</lang>
- Output:
Input : Visual Basic .NET Output : Vsl Bsc .NT
Wren
<lang ecmascript>var removeVowels = Fn.new { |s| s.where { |c| !"aeiouAEIOU".contains(c) }.join() }
var s = "Wren Programming Language" System.print("Input : %(s)") System.print("Output : %(removeVowels.call(s))")</lang>
- Output:
Input : Wren Programming Language Output : Wrn Prgrmmng Lngg
XBS
<lang xbs>func RemoveVowels(x:string):string{ set Vowels:array="aeiou"::split(); set nx:string=""; for(i=0;?x-1;1){ set c = x::at(i); if (!Vowels::has(c)){ nx+=x::at(i); } del c; } del Vowels; send nx; }
log(RemoveVowels("Hello, world!"));</lang>
- Output:
Hll, wrld!
XPL0
<lang XPL0>string 0; \make strings zero-terminated
func Disemvowel(S); \remove vowels from string char S; int I, O; [O:= 0; for I:= 0 to -1>>1 do \for many times...
[case S(I) ! $20 of \shift to lowercase ^a,^e,^i,^o,^u: [] \do nothing other [S(O):= S(I); O:= O+1]; \otherwise copy char if S(I)=0 then return S; ];
];
Text(0, Disemvowel("pack my box with FIVE DOZEN LIQUOR JUGS!"))</lang>
Output:
pck my bx wth FV DZN LQR JGS!
XProfan
<lang XProfan>cls Set("RegEx",1) Var string e = "The quick brown fox jumps over the lazy dog" Var string a = Translate$(e,"(?i)[aeiou]","") MessageBox("Input : "+e+"\nOutput: "+a,"Remove vowels",1) End</lang>
- Output:
Input : The quick brown fox jumps over the lazy dog Output: Th qck brwn fx jmps vr th lzy dg
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