dist-javascript-algorithms-and-data-structures/dist/algorithms/sets/combinations/combineWithoutRepetitions.js

Algorithms and data-structures implemented on JavaScript

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = combineWithoutRepetitions;

/**
 * @param {*[]} comboOptions
 * @param {number} comboLength
 * @return {*[]}
 */
function combineWithoutRepetitions(comboOptions, comboLength) {
  if (comboLength === 1) {
    return comboOptions.map(comboOption => [comboOption]);
  } // Init combinations array.


  const combos = []; // Eliminate characters one by one and concatenate them to
  // combinations of smaller lengths.

  comboOptions.forEach((currentOption, optionIndex) => {
    const smallerCombos = combineWithoutRepetitions(comboOptions.slice(optionIndex + 1), comboLength - 1);
    smallerCombos.forEach(smallerCombo => {
      combos.push([currentOption].concat(smallerCombo));
    });
  });
  return combos;
}