15 lines
348 B
Markdown
15 lines
348 B
Markdown
### powerset
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Returns the powerset of a given array of numbers.
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Use `Array.reduce()` combined with `Array.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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```js
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powerset([1,2]) -> [[], [1], [2], [2,1]]
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```
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