HH\Set::__construct
Creates a Set from the given Traversable, or an empty Set if null
is passed
public function __construct(
?Traversable<Tv> $iterable = NULL,
): void;
Parameters
?Traversable<Tv>$iterable = NULL
Returns
void
Examples
This example shows how to create a Set from various Traversables. Notice that duplicate values in the input Traversables only appear once in the output Set.
// Create a new Set from an array
$s = new Set(varray['red', 'green', 'red', 'blue', 'blue', 'yellow']);
\var_dump($s);
// Create a new Set from a Vector
$s = new Set(Vector {'red', 'green', 'red', 'blue', 'blue', 'yellow'});
\var_dump($s);
// Create a new Set from the values of a Map
$s = new Set(Map {
'red1' => 'red',
'green' => 'green',
'red2' => 'red',
'blue1' => 'blue',
'blue2' => 'blue',
'yellow' => 'yellow',
});
\var_dump($s);
This example shows how passing null to the constructor creates an empty Set:
// An empty Set is created if null is provided
$s = new Set(null);
\var_dump($s);