24 lines
607 B
JavaScript
24 lines
607 B
JavaScript
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//#region src/array/cartesianProduct.ts
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function cartesianProduct(...arrs) {
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if (arrs.length === 0) return [[]];
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let total = 1;
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for (let i = 0; i < arrs.length; i++) total *= arrs[i].length;
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if (total === 0) return [];
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const n = arrs.length;
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const result = Array(total);
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for (let i = 0; i < total; i++) {
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const tuple = Array(n);
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let idx = i;
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for (let j = n - 1; j >= 0; j--) {
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const arr = arrs[j];
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const len = arr.length;
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tuple[j] = arr[idx % len];
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idx = Math.floor(idx / len);
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}
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result[i] = tuple;
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}
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return result;
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}
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//#endregion
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exports.cartesianProduct = cartesianProduct;
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