9 lines
235 B
Markdown
9 lines
235 B
Markdown
### Powerset
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Use `reduce()` combined with `map()` to iterate over elements and combine into an array containing all combinations.
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```js
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const powerset = arr =>
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arr.reduce( (a,v) => a.concat(a.map( r => [v].concat(r) )), [[]]);
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```
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