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mapKey()

The mapKey() method all similar to map(), but this applies to keys
Example.php
<?php use kim\present\utils\arrays\ArrayUtils;
​
$arrayUtils = ArrayUtils::from(range(1,5));
​
//Squared all elements
$arrayUtils->mapKey(function($num){ return "$num * $num"; });
// expected output: [
// "1 * 1" => 1,
// "2 * 2" => 2,
// "3 * 3" => 3,
// "4 * 4" => 4,
// "5 * 5" => 5
//]

Syntax

$arrayUtils->mapKey(callable $callback) : ArrayUtils;

Parameter

  • $callback
    A function that produces an element of the new Array, taking three arguments:
    • $value The current element being processed in the array.
    • $key The index of the current element being processed in the array.
    • $array The array every was called upon.

​

Return value

  • A new array with each element being the result of the callback function.

Prefixing

$arrayUtils->mapKeyAs(callable $callback) : array;
ArrayUtils::mapKeyFrom(iterable $from, callable $callback) : ArrayUtils;
ArrayUtils::mapKeyFromAs(iterable $from, callable $callback) : array;

References

​
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Last modified 2yr ago