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50 lines
1.3 KiB
JavaScript
50 lines
1.3 KiB
JavaScript
(function (exports) {
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'use strict';
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var cartesianProduct = (function () {
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var result;
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function cartesianProduct(sets, index, current) {
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if (index === sets.length) {
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return result.push(current.slice());
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}
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for (var i = 0; i < sets[index].length; i += 1) {
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current[index] = sets[index][i];
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cartesianProduct(sets, index + 1, current);
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}
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}
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/**
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* Calculates Cartesian product of provided sets.
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*
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* @module combinatorics/cartesianproduct
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* @public
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* @param {Array} sets Array of sets.
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* @return {Array} Cartesian product of provided sets.
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*
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* @example
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* var product = require('path-to-algorithms/src/combinatorics/' +
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* 'cartesianproduct').cartesianProduct;
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* var result = product([[1, 2, 3], [3, 2, 1]]);
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* // [ [ 1, 3 ],
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* // [ 1, 2 ],
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* // [ 1, 1 ],
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* // [ 2, 3 ],
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* // [ 2, 2 ],
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* // [ 2, 1 ],
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* // [ 3, 3 ],
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* // [ 3, 2 ],
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* // [ 3, 1 ] ]
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* console.log(result);
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*/
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return function (sets) {
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result = [];
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cartesianProduct(sets, 0, []);
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return result;
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};
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}());
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exports.cartesianProduct = cartesianProduct;
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}((typeof window === 'undefined') ? module.exports : window));
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