subsets

Lists all possible subsets. 🏃 📼 📦 🌔 📒

Similar: subset, subsets, isSubset.

entries.subsets(x, [n]);
// x: a map
// n: number of entries (-1 => any)

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

var x = [['a', 1], ['b', 2]];
[...entries.subsets(x)].map(a => [...a]);
// [ [], [ [ 'a', 1 ] ], [ [ 'b', 2 ] ], [ [ 'a', 1 ], [ 'b', 2 ] ] ]

var x = [['a', 1], ['b', 2], ['c', 3]];
[...entries.subsets(x)].map(a => [...a]);
// [
//   [],
//   [ [ 'a', 1 ] ],
//   [ [ 'b', 2 ] ],
//   [ [ 'a', 1 ], [ 'b', 2 ] ],
//   [ [ 'c', 3 ] ],
//   [ [ 'a', 1 ], [ 'c', 3 ] ],
//   [ [ 'b', 2 ], [ 'c', 3 ] ],
//   [ [ 'a', 1 ], [ 'b', 2 ], [ 'c', 3 ] ]
// ]

references

• Data.List.subsequences: Haskell