Ds\Map::map

(PECL ds >= 1.0.0)

Ds\Map::map — Returns the result of applying a callback to each value

Description

public Ds\Map::map(callable $callback): Ds\Map

Returns the result of applying a callback function to each value of the map.

Parameters

callback

callback(mixed $key, mixed $value): mixed

A callable to apply to each value in the map.

The callable should return what the key will be mapped to in the resulting map.

Return Values

The result of applying a callback to each value in the map.

Note:
The keys and values of the current instance won't be affected.

Examples

Example #1 Ds\Map::map() example

<?php
$map = new \Ds\Map(["a" => 1, "b" => 2, "c" => 3]);

print_r($map->map(function($key, $value) { return $value * 2; }));
print_r($map);
?>

The above example will output something similar to:

(
 [0] => Ds\Pair Object
 (
 [key] => a
 [value] => 2
 )
 [1] => Ds\Pair Object
 (
 [key] => b
 [value] => 4
 )
 [2] => Ds\Pair Object
 (
 [key] => c
 [value] => 6
 )
)
Ds\Map Object
(
 [0] => Ds\Pair Object
 (
 [key] => a
 [value] => 1
 )
 [1] => Ds\Pair Object
 (
 [key] => b
 [value] => 2
 )
 [2] => Ds\Pair Object
 (
 [key] => c
 [value] => 3
 )
)

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