HH\Vector::firstValue

Returns the first value in the current Vector

public function firstValue(): ?Tv;

Returns

• ?Tv - The first value in the current Vector, or null if the Vector is empty.

Examples

The following example gets the first value from Vector. An empty Vector will return null as its first value.

$v = Vector {'red', 'green', 'blue', 'yellow'};
var_dump($v->firstValue());

$v = Vector {};
var_dump($v->firstValue());

string(3) "red"
NULL