Returns the first value in the vector

# Ds\Vector::first

(PECL ds >= 1.0.0)

Ds\Vector::first — Returns the first value in the vector

### Description

public function Ds\Vector::first(): mixed

Returns the first value in the vector.

### Parameters

This function has no parameters.

### Return Values

The first value in the vector.

### Errors/Exceptions

UnderflowException if empty.

### Examples

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

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

The above example will output something similar to:

    int(1)

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