subsequences

Lists all possible subsequences. [:running:] [:vhs:] [:package:] [:moon:]

array.subsequences(x, [n]);
// x: an array
// n: number of values (-1 => any)
// --> ...subsequences

const array = require('extra-array');

[...array.subsequences([1, 2])];
// [ [], [ 1 ], [ 2 ], [ 1, 2 ] ]

[...array.subsequences([1, 2, 3])];
// [
//   [],       [ 1 ],
//   [ 2 ],    [ 1, 2 ],
//   [ 3 ],    [ 1, 3 ],
//   [ 2, 3 ], [ 1, 2, 3 ]
// ]

references

• Data.List.subsequences(): Haskell [:running:]: https://npm.runkit.com/@extra-array/subsequences [:package:]: https://www.npmjs.com/package/@extra-array/subsequences [:moon:]: https://www.npmjs.com/package/@extra-array/subsequences.min [:vhs:]: https://asciinema.org/a/319435