Creating an Array: Difference between revisions
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'''Please do not add new code, and merge existing code to the [[Arrays]] task.''' |
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This task is about [[numeric arrays]]. For '''hashes''' or '''associative arrays''', please see [[Creating an Associative Array]]. |
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This task is about numerically-indexed arrays. For '''hashes''' or '''associative arrays''', please see [[Creating an Associative Array]]. |
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In this task, the goal is to create an [[array]]. Mention if the [[array base]] begins at a number other than zero. |
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In this task, the goal is to create an [[array]]. Mention if the [[array base]] begins at a number other than zero. |
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==[[ActionScript]]== |
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In addition, demonstrate how to initialize an array variable with data. |
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[[Category:ActionScript]] |
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// ActionScript arrays are zero-based |
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// |
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// creates an empty array |
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var arr1:Array = new Array(); |
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// creates an array with 3 numerical values |
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var arr2:Array = new Array(1,2,3); |
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// |
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// or just use the shorthand |
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var u:Array = []; |
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var v:Array = [1,2,3]; |
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==[[Ada]]== |
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[[Category:Ada]] |
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'''Compiler:''' GCC 4.1.2 |
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Ada array indices may begin at any value, not just 0 or 1 |
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type Arr is array (Integer range <>) of Integer; |
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Uninitialized : Arr (1 .. 10); |
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Initialized_1 : Arr (1 .. 20) := (others => 1); |
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Initialized_2 : Arr := (1 .. 30 => 2); |
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Const : constant Arr := (1 .. 10 => 1, 11 .. 20 => 2, 21 | 22 => 3); |
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Centered : Arr (-50..50) := (0 => 1, Others => 0); |
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Ada arrays may be indexed by enumerated types, which are discrete non-numeric types |
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type Days is (Mon, Tue, Wed, Thu, Fri, Sat, Sun); |
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type Activities is (Work, Fish); |
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type Daily_Activities is array(Days) of Activities; |
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This_Week : Daily_Activities := (Mon..Fri => Work, Others => Fish); |
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==[[AppleScript]]== |
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[[Category:AppleScript]] |
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AppleScript supports "arrays" as "lists," and they are not limited by a single type. |
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set array1 to {} |
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set array2 to {1, 2, 3, 4, "hello", "world"} |
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==[[BASIC]]== |
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[[Category:BASIC]] |
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'''Interpeter:''' [[QuickBasic]] 4.5, PB 7.1 |
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REM Force index to start at 1..n |
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OPTION BASE 1 |
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REM Force index to start at 0..n |
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OPTION BASE 0 |
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REM Specify that the array is dynamic and not static |
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'$DYNAMIC |
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DIM SHARED myArray(-10 TO 10, 10 TO 30) AS STRING |
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REDIM SHARED myArray(20, 20) AS STRING |
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myArray(1,1) = "Item1" |
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myArray(1,2) = "Item2" |
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==[[C]]== |
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[[Category:C]] |
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'''Compiler:''' GCC, MSVC, BCC, Watcom |
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'''Libraries:''' Standard |
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Dynamic |
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#include <stdlib.h> /* for malloc */ |
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#include <string.h> /* for memset */ |
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int n = 10 * sizeof(int); |
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int *myArray = (int*)malloc(n); |
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if(myArray != NULL) |
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{ |
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memset(myArray, 0, n); |
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myArray[0] = 1; |
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myArray[1] = 2; |
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free(myArray); |
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myArray = NULL; |
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} |
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Static |
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int myArray2[10] = { 1, 2, 0}; /* 3..9 := 0 */ |
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==[[C plus plus|C ]]== |
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[[Category:C plus plus]] |
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'''Compiler:''' [[GCC]], [[Visual C plus plus|Visual C ]], [[BCC]], [[Watcom]] |
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Using dynamically-allocated memory: |
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const int n = 10; |
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int* myArray = new int[n]; |
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if(myArray != NULL) |
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{ |
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myArray[0] = 1; |
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myArray[1] = 2; |
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delete[] myArray; |
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myArray = NULL; |
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} |
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Using fixed memory: |
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int myArray2[10] = { 1, 2, 0}; /* 3..9 := 0 */ |
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'''Libraries:''' [[STL]] |
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// STL |
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std::vector<int> myArray3(10); |
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myArray3.push_back(1); |
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myArray3.push_back(2); |
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'''Libraries:''' [[Qt]] |
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// Qt |
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QVector<int> myArray4(10); |
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myArray4.push_back(1); |
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myArray4.push_back(2); |
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'''Libraries:''' [[Microsoft Foundation Classes]] |
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// MFC |
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CArray<int,int> myArray5(10); |
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myArray5.Add(1); |
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myArray5.Add(2); |
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==[[C sharp|C#]]== |
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[[Category:C sharp]] |
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Example of array of 10 int types: |
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int[] numbers = new int[10]; |
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Example of array of 3 string types: |
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string[] words = { "these", "are", "arrays" }; |
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You can also declare the size of the array and initialize the values at the same time: |
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int[] more_numbers = new int[3]{ 21, 14 ,63 }; |
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For Multi-Deminsional arrays you declare them the same except for a comma in the type declaration. |
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The following creates a 3x2 int matrix |
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int[,] number_matrix = new int[3,2]; |
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As with the previous examples you can also initialize the values of the array, the only difference being each row in the matrix must be enclosed in its own braces. |
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string[,] string_matrix = { {"I","swam"}, {"in","the"}, {"freezing","water"} }; |
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or |
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string[,] funny_matrix = new string[2,2]{ {"clowns", "are"} , {"not", "funny"} }; |
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==[[Clean]]== |
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[[Category:Clean]] |
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Array denotations are overloaded in Clean, therefore we explicitly specify the types. There are lazy, strict, and unboxed array. |
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===Lazy array=== |
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Create a lazy array of strings using an array denotation. |
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array :: {String} |
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array = {"Hello", "World"} |
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Create a lazy array of floating point values by sharing a single element. |
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array :: {Real} |
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array = createArray 10 3.1415 |
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Create a lazy array of integers using an array (and also a list) comprehension. |
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array :: {Int} |
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array = {x \\ x <- [1 .. 10]} |
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===Strict array=== |
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Create a strict array of integers. |
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array :: {!Int} |
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array = {x \\ x <- [1 .. 10]} |
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===Unboxed array=== |
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Create an unboxed array of characters, also known as <tt>String</tt>. |
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array :: {#Char} |
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array = {x \\ x <- ['a' .. 'z']} |
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==[[ColdFusion]]== |
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[[Category:ColdFusion]] |
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Creates a one-dimensional Array |
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<cfset arr1 = ArrayNew(1)> |
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Creates a two-dimensional Array in CFScript |
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<cfscript> |
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arr2 = ArrayNew(2); |
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</cfscript> |
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''ColdFusion Arrays are '''NOT''' zero-based, they begin at index '''1''''' |
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==[[Common Lisp]]== |
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[[Category:Common Lisp]] |
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Creates a one-dimensional array of length 10. |
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(make-array 10) |
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Creates a two-dimensional array with dimensions 10x20. |
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(make-array '(10 20)) |
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<tt>make-array</tt> may be called with a number of optional arguments. |
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(make-array 4 :element-type 'fixnum :initial-contents '(1 2 3 4) :adjustable t) |
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==[[D]]== |
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[[Category:D]] |
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'''Compiler:''' [[DMD]],[[GDC]] |
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// dynamic array |
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int[] numbers = new int[5]; |
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// static array |
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int[5] = [0,1,2,3,4]; |
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==[[Forth]]== |
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[[Category:Forth]] |
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Forth has a variety of ways to allocate arrays of data, though it has no built-in array handling words, favoring pointer manipulation. |
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Static array of 200 cells, uninitialized: |
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create MyArray 200 cells allot |
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here MyArray - cell / constant MyArraySize |
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Static array containing the numbers 1 to 5 |
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create MyArray 1 , 2 , 3 , 4 , 5 , |
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here MyArray - cell / constant MyArraySize |
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Dynamic array allocation: |
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0 value MyArray |
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200 cells allocate to MyArray |
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Dynamic array free: |
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MyArray free |
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0 to MyArray |
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==[[Fortran]]== |
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[[Category:Fortran]] |
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Default case: |
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integer a(10) |
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this will have ten elements. Counting starts at 1. If a zero-based array is needed, declare like this: |
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integer a(0:9) |
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this mechanism can be extended to any numerical indices, and allowed number of dimensions (and of course to other data types than integers). For example |
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real*8 (25:29,12) |
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will be an two-dimensional, 5x12-array of 8-byte floats, where the first dimension can be addressed numerically as 25, 26, 27, 28 or 29 (and the second dimension as 1 .. 12). |
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==[[IDL]]== |
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[[Category:IDL]] |
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IDL doesn't really distinguish between scalars and arrays - the same operations that can create the one can <i>usually</i> create the other as well. |
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a = 3 |
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help,a |
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A INT = 3 |
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print,a^2 |
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9 |
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a = [3,5,8,7] |
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help,a |
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A INT = Array[4] |
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print,a^2 |
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9 25 64 49 |
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==[[Java]]== |
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[[Category:Java]] |
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For example for an array of 10 int values: |
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int[] intArray = new int[10]; |
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Creating an array of Strings: |
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String[] s = {"hello" , "World" }; |
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==[[JavaScript]]== |
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[[Category:JavaScript]] |
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var myArray = new Array(); |
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var myArray2 = new Array("Item1","Item2"); |
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var myArray3 = ["Item1", "Item2"]; |
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==[[MAXScript]]== |
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[[Category:MAXScript]] |
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'''Interpreter:''' [[3D Studio Max]] 8 |
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myArray = #() |
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myArray2 = #("Item1", "Item2") |
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==[[mIRC Scripting Language]]== |
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[[Category:mIRC Scripting Language]] |
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'''Interpeter:''' mIRC Script Editor |
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'''Libraries:''' [[mArray Snippet]] |
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alias creatmearray { .echo -a $array_create(MyArray, 5, 10) } |
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==[[OCaml]]== |
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[[Category:OCaml]] |
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Using an array literal: |
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let array = [| 1; 2; 3; 4; 5 |];; |
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To create an array of five elements with the value 0: |
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let num_items = 5 and initial_value = 0;; |
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let array = Array.make num_items initial_value |
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To create an array with contents defined by passing each index to a callback (in this example, the array is set to the squares of the numbers 0 through 4): |
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let callback index = index * index;; |
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let array = Array.init 5 callback |
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==[[Perl]]== |
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[[Category:Perl]] |
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'''Interpreter:''' [[Perl]] 5 |
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my @empty; |
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my @empty_too = (); |
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my @populated = ('This', 'That', 'And', 'The', 'Other'); |
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print $populated[2]; |
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# And |
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my $aref = ['This', 'That', 'And', 'The', 'Other']; |
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print aref->[2]; |
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# And |
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# having to quote like that really sucks, and that's why we got syntactic sugar |
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my @wakey_wakey = qw(coffee sugar cream); |
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push @wakey_wakey, 'spoon'; |
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# add spoon to right-hand side |
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my $cutlery = pop @wakey_wakey; |
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# remove spoon |
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unshift @wakey_wakey, 'cup'; |
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# add cup to left-hand side |
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my $container = shift @wakey_wakey; |
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# remove cup |
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my @multi_dimensional = ( |
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[0, 1, 2, 3], |
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[qw(a b c d e f g)], |
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[qw(! $ % |
Latest revision as of 15:07, 29 November 2019
Please do not add new code, and merge existing code to the Arrays task.
Creating an Array was a programming task. It has been deprecated for reasons that are discussed in its talk page.
This task is about numerically-indexed arrays. For hashes or associative arrays, please see Creating an Associative Array.
In this task, the goal is to create an array. Mention if the array base begins at a number other than zero. In addition, demonstrate how to initialize an array variable with data.