Ds\Sequence::first

(PECL ds >= 1.0.0)

Ds\Sequence::first — Returns the first value in the sequence

Description

abstract public Ds\Sequence::first(): mixed

Returns the first value in the sequence.

Parameters

This function has no parameters.

Return Values

The first value in the sequence.

Errors/Exceptions

UnderflowException if empty.

Examples

Example #1 Ds\Sequence::first() example

<?php
$sequence = new \Ds\Vector([1, 2, 3]);
var_dump($sequence->first());
?>

The above example will output something similar to:

int(1)