21 lines
427 B
Markdown
21 lines
427 B
Markdown
---
|
|
title: Array sum
|
|
tags: math
|
|
cover: lake-trees
|
|
firstSeen: 2017-12-29T13:29:49+02:00
|
|
lastUpdated: 2020-10-22T20:24:30+03:00
|
|
---
|
|
|
|
Calculates the sum of two or more numbers/arrays.
|
|
|
|
- Use `Array.prototype.reduce()` to add each value to an accumulator, initialized with a value of `0`.
|
|
|
|
```js
|
|
const sum = (...arr) => [...arr].reduce((acc, val) => acc + val, 0);
|
|
```
|
|
|
|
```js
|
|
sum(1, 2, 3, 4); // 10
|
|
sum(...[1, 2, 3, 4]); // 10
|
|
```
|