apply: Difference between revisions

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Groups:: Arrays

Syntax:: array apply code
Parameters:: array: Array - array of Anything
: code: Code - code to be executed on each element of the array. Current element value is stored in variable _x
Return Value:: Array - resulting array

Syntax:: hashmap apply code
Parameters:: hashmap: HashMap
: code: Code - code to be executed on each element of the hashmap. Current key is stored in variable _x, and the value is stored in variable _y
Return Value:: Array - resulting array

Example 1:: _arr = [1,2,3,4,5,6,7,8,9,0] apply {[1,0] select (_x % 2 == 0)}; //[1,0,1,0,1,0,1,0,1,0]
Example 2:: _arr = [1,2,3,4,5,6,7,8,9,0] apply {_x ^ _x}; //[1,4,27,256,3125,46656,823543,16777216,387420480,1]
Example 3:: _arr1 = []; _arr1 resize 20; _arr2 = _arr1 apply {0}; //[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
Example 4:: [0,1,2,3,4] apply {str _x}; // Returns ["0","1","2","3","4"]
Example 5:: _hashmap = createHashMapFromArray [["key", "value"]]; _array = _hashmap apply {_y}; //["value"]

See also:: set resize pushBack pushBackUnique select reverse count find in forEach deleteAt deleteRange append sort arrayIntersect

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Only post proven facts here! Add Note

: Posted on February 18, 2016 - 11:03 (UTC)
Fusselwurm: (to anyone else wondering, I took a minute to get it): This is Array.map() in JavaScript

: Posted on February 11, 2018 - 23:02 (UTC)
Lou Montana: if performance really is an issue, apply seems to be (very) slightly faster than forEach (by more or less one percent, 0.7-1.5% in my tests to be precise).

@@ Line 33: / Line 33: @@
 |x4= <code>[0,1,2,3,4] [[apply]] {[[str]] _x}; {{cc|Returns ["0","1","2","3","4"]}}</code>
 |x5= <code>_hashmap = [[createHashMapFromArray]] <nowiki>[["key", "value"]]</nowiki>;
-_array = _hashmap [[apply]] {_y}; //["value"]
+_array = _hashmap [[apply]] {_y}; //["value"]</code>
 |seealso= [[set]], [[resize]], [[pushBack]], [[pushBackUnique]], [[select]], [[reverse]], [[count]], [[find]], [[in]], [[forEach]], [[deleteAt]], [[deleteRange]], [[append]], [[sort]], [[arrayIntersect]]