15 lines
348 B
Markdown
15 lines
348 B
Markdown
### powerset
|
|
|
|
Returns the powerset of a given array of numbers.
|
|
|
|
Use `Array.reduce()` combined with `Array.map()` to iterate over elements and combine into an array containing all combinations.
|
|
|
|
```js
|
|
const powerset = arr =>
|
|
arr.reduce((a, v) => a.concat(a.map(r => [v].concat(r))), [[]]);
|
|
```
|
|
|
|
```js
|
|
powerset([1,2]) // [[], [1], [2], [2,1]]
|
|
```
|