Ds\Map::map

(PECL ds >= 1.0.0)

Ds\Map::mapReturns the result of applying a callback to each value.

Description

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

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

Parameters

callback

mixed callback ( mixed $key , mixed $value )

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
        )

)
add a note add a note

User Contributed Notes

There are no user contributed notes for this page.
To Top