Apply a callback to an array: Difference between revisions
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2.23606798
</pre>
=={{header|Binary Lambda Calculus}}==
In the lambda calculus, we can map over a list as in https://github.com/tromp/AIT/blob/master/lists/map.lam, which gives the following BLC program to negate every bit of input:
<pre>010001101000000101100000000001011000000101111111010110010111111101111110111010</pre>
=={{header|BQN}}==
<syntaxhighlight lang="bqn">Square ← ט
array ← 2‿3‿5‿7‿11‿13
The use of the ¨ modifier is the general approach, but actually not necessary with arithmetic functions.
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<pre>⟨ 4 9 25 49 121 169 ⟩</pre>
=={{header|Bracmat}}==
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=={{header|COBOL}}==
{{Works with|COBOL 2002}}
Basic implementation of a map function:
<syntaxhighlight lang="
▲ DATA DIVISION.
WORKING-STORAGE SECTION.▼
01 Table-Size CONSTANT 30.▼
LINKAGE SECTION.▼
DATA DIVISION.
01 i USAGE IS INDEX.
01 table-param.
03 table-values USAGE IS FLOAT-LONG, OCCURS table-size TIMES.
01 func-ptr USAGE IS PROGRAM-POINTER.
PROCEDURE DIVISION USING BY REFERENCE table-param, BY VALUE func-ptr.
END PROGRAM map.</syntaxhighlight>
▲ GOBACK
▲ .</syntaxhighlight>
=={{header|CoffeeScript}}==
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=={{header|Elena}}==
ELENA
<syntaxhighlight lang="elena">import system'routines;
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public program()
{
new int[]{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}.forEach
}</syntaxhighlight>
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{{FormulaeEntry|page=https://formulae.org/?script=examples/Apply_a_callback_to_an_array}}
'''Solution'''
Most programming languages define a high-order map function. In Fōrmulæ, there is ''arraization'' (by analogy with ''summation''). In the following expression, the "big" curly braces resembles the "big" sigma of a summation:
[[File:Fōrmulæ - Apply a callback to an array 01.png]]
[[File:Fōrmulæ - Apply a callback to an array 02.png]]
The elements of the array are not required to be of the same type:
[[File:Fōrmulæ - Apply a callback to an array 03.png]]
[[File:Fōrmulæ - Apply a callback to an array 04.png]]
=={{header|GAP}}==
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=={{header|langur}}==
<syntaxhighlight lang="langur">writeln map
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=={{header|Wren}}==
<syntaxhighlight lang="
arr = arr.map { |x| x * 2 }.toList
arr = arr.map(Fn.new { |x| x / 2 }).toList
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