Package Exports
- powerset-gen
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Readme
powerset-gen
A generator function that produces all subsets of the given set in input.
Install
npm install powerset-genUsage
Both ES6 Module and CommonJS distributions are provided by this package.
ES6 Module
import generator from "poweset-get"ES5 / CommonJS
var generator = require("powerset-gen");API
The module exports the following function.
generator(set, [mapper]) ⇒ Generator
| Param | Type | Default | Description |
|---|---|---|---|
| set | Array |
The given set in input | |
| mapper | Function |
(value, index) => value |
(optional) Function that maps the yielded value, taking two arguments: - value The current subset being generated - index The index of the current subset being generated |
Examples
for..of
for (const subset of generator(["a", "b", "c"])) {
console.log(subset)
}Output
[]
["a"]
["b"]
["a", "b"]
["c"]
["a", "c"]
["b", "c"]
["a", "b", "c"]Generate an Array
[...generator(["a", "b"])]
// or
Array.from(generator(["a", "b"]))Generate a Set
new Set(generator(["a", "b"]))Spreading in function call
console.log(...generator(["a", "b"]))Indexes
for (const [index, subset] of generator(["a", "b", "c"], (value, i) => [i, value])) {
console.log(index, subset)
}Output
0 []
1 ["a"]
2 ["b"]
3 ["a", "b"]
4 ["c"]
5 ["a", "c"]
6 ["b", "c"]
7 ["a", "b", "c"]Binary mask
for (const [mask, subset] of generator(["a", "b", "c"], (value, index) => [index.toString(2), value])) {
console.log(mask, subset)
}Output
0 []
1 ["a"]
10 ["b"]
11 ["a", "b"]
100 ["c"]
101 ["a", "c"]
110 ["b", "c"]
111 ["a", "b", "c"]