Computes the sum of a sequence of numbers projected from elements of a sequence.

## Usage

Sum`1`

, `2`

, and `3`

like this:
```js
var sum = require('@kingjs/linq.sum');
var sequence = require('@kingjs/enumerable.create');
var summation = sum.call(sequence(1, 2, 3));
```
result:
```js
6
```
## API

```ts declare function sum( this: Enumerable ): number; ```### Interfaces

`Enumerable`

: See @kingjs/enumerable.define.

### Parameters

`this`

: The sequence to sum.

### Return Value

The summation of the sequence.## Install

With npm installed, run ``` $ npm install @kingjs/linq.sum ```## Acknowledgments

Like`Element.Sum`

.aspx).