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