[FR] Cartesian Product iterator

[mProjectsCode]

It would be great to be able to iterate over the cartesian product of multiple lists.

[Smoren]

Hi @mProjectsCode,

Thank you for your suggestion! It was implemented in v1.27.0 release.

New features

• set
  • cartesianProduct()
  • cartesianProductAsync()
• Stream
  • cartesianProductWith()
• AsyncStream
  • cartesianProductWith()

Examples

import { set } from 'itertools-ts';

const numbers = [1, 2];
const letters = ['a', 'b'];
const chars = ['!', '?'];

for (const tuple of set.cartesianProduct(numbers, letters, chars)) {
  console.log(tuple);
}
/*
  [1, 'a', '!'],
  [1, 'a', '?'],
  [1, 'b', '!'],
  [1, 'b', '?'],
  [2, 'a', '!'],
  [2, 'a', '?'],
  [2, 'b', '!'],
  [2, 'b', '?'],
*/

import { Stream } from "itertools-ts";

const numbers = [1, 2];

const result = Stream.of(numbers)
  .cartesianProductWith(['a', 'b'], ['!', '?'])
  .toArray();
/*
[
  [1, 'a', '!'],
  [1, 'a', '?'],
  [1, 'b', '!'],
  [1, 'b', '?'],
  [2, 'a', '!'],
  [2, 'a', '?'],
  [2, 'b', '!'],
  [2, 'b', '?'],
]
*/

[mProjectsCode]

thanks :)