| public __construct ( callable $keySelector = null, callable $comparer = null ) | ||
| $keySelector | callable | |
| $comparer | callable | |
public function __construct(callable $keySelector = null, callable $comparer = null)
{
$this->comparer = $comparer ?: function ($x, $y) {
return $x == $y;
};
$this->keySelector = $keySelector;
}