10 lines
291 B
Markdown
10 lines
291 B
Markdown
### Powerset
|
|
|
|
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) )), [[]]);
|
|
// powerset([1,2]) -> [[], [1], [2], [2,1]]
|
|
```
|