Ds\Map::first
Returns the first pair in the map
説明
public Ds\Pair Ds\Map::first()
戻り値
The first pair in the map.
エラー / 例外
UnderflowException if empty.
例
例1 Ds\Map::first example
<?php
$map = new \Ds\Map(["a" => 1, "b" => 2, "c" => 3]);
var_dump($map->first());
?>
object(Ds\Pair)#2 (2) {
["key"]=>
string(1) "a"
["value"]=>
int(1)
}