Ds\Map::union

Creates a new map using values from the current instance and another map

説明

public Ds\Map Ds\Map::union(Ds\Map $map)

Creates a new map that contains the pairs of the current instance as well as the pairs of another map.

A ∪ B = {x: x ∈ A ∨ x ∈ B}

注意:
Values of the current instance will be overwritten by those provided where keys are equal.

パラメータ

map: The other map, to combine with the current instance.

戻り値

A new map containing all the pairs of the current instance as well as another map.

参考

» Union on Wikipedia

例

例1 Ds\Map::union example

<?php
$a = new \Ds\Map(["a" => 1, "b" => 2, "c" => 3]);
$b = new \Ds\Map(["b" => 3, "c" => 4, "d" => 5]);

print_r($a->union($b));
?>

上の例の出力は、たとえば以下のようになります。

Ds\Map Object
(
    [0] => Ds\Pair Object
        (
            [key] => a
            [value] => 1
        )

    [1] => Ds\Pair Object
        (
            [key] => b
            [value] => 3
        )

    [2] => Ds\Pair Object
        (
            [key] => c
            [value] => 4
        )

    [3] => Ds\Pair Object
        (
            [key] => d
            [value] => 5
        )

)