18 lines
440 B
Markdown
18 lines
440 B
Markdown
---
|
|
title: accumulate
|
|
tags: math,array,beginner
|
|
---
|
|
|
|
Returns an array of partial sums.
|
|
|
|
Use `Array.prototype.reduce()`, `Array.prototype.slice(-1)` and the unary `+` operator to add each value to the unary array containing the previous sum.
|
|
|
|
```js
|
|
const accumulate = (...nums) => nums.reduce((acc, n) => [...acc, n + +acc.slice(-1)],[]);
|
|
```
|
|
|
|
```js
|
|
accumulate(1, 2, 3, 4); // [1, 3, 6, 10]
|
|
accumulate(...[1, 2, 3, 4]); // [1, 3, 6, 10]
|
|
```
|