Returns the sum of all values in the map

# Ds\Map::sum

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Ds\Map::sum — Returns the sum of all values in the map

### Description

public Ds\Map::sum(): int|float

Returns the sum of all values in the map.

> Note:

> Arrays and objects are considered equal to zero when calculating the sum.

### Parameters

This function has no parameters.

### Return Values

The sum of all the values in the map as either a float or int depending on the values in the map.

### Examples

Example #1 Ds\Map::sum() integer example

`<?php
$map = new \Ds\Map(["a" => 1, "b" => 2, "c" => 3]);
var_dump($map->sum());
?>`

The above example will output something similar to:

    int(6)

Example #2 Ds\Map::sum() float example

`<?php
$map = new \Ds\Map(["a" => 1, "b" => 2.5, "c" => 3]);
var_dump($map->sum());
?>`

The above example will output something similar to:

    float(6.5)

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