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Run results for:
npm:fast-cartesian product vs native .reduce()
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<iframe src="https://measurethat.net/Embed?id=532386" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:127.0) Gecko/20100101 Firefox/127.0
Browser:
Firefox 127
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
npm:fast-cartesian
3513.1 Ops/sec
native .reduce() with flatmap, concat
5111044.0 Ops/sec
native .reduce() with map, spread
9411447.0 Ops/sec
Script Preparation code:
var data = [[1,2,3,4,5,6,7,8,9,10],[1,2,3,4,5,6,7,8,9,10],[1,2,3,4,5,6,7,8,9,10],[1,2,3,4,5,6,7,8,9,10]]
Tests:
npm:fast-cartesian
// Does a cartesian product on several arrays. // Returns an array with the results. // Optimized to be the fastest implementation in JavaScript. function fastCartesian(arrays) { if (arrays.length === 0) { return [] } const loopFunc = getLoopFunc(arrays.length) const result = [] loopFunc(arrays, result) return result } const getLoopFunc = function (length) { const cachedLoopFunc = cache[length] if (cachedLoopFunc !== undefined) { return cachedLoopFunc } const loopFunc = mGetLoopFunc(length) // eslint-disable-next-line fp/no-mutation cache[length] = loopFunc return loopFunc } const cache = {} // Create a function with `new Function()` that does: // function(arrays, results) { // for (const value0 of arrays[0]) { // for (const value1 of arrays[1]) { // // and so on // results.push([value0, value1]) // } // } // } const mGetLoopFunc = function (length) { const indexes = Array.from({ length }, getIndex) const start = indexes .map((index) => `for (const value${index} of arrays[${index}]) {`) .join('\n') const middle = indexes.map((index) => `value${index}`).join(', ') const end = '}\n'.repeat(length) // eslint-disable-next-line no-new-func return new Function( 'arrays', 'result', `${start}\nresult.push([${middle}])\n${end}`, ) } const getIndex = function (value, index) { return String(index) } const product = fastCartesian(data)
native .reduce() with flatmap, concat
const cartesianProduct = (...allEntries) => allEntries.reduce( (subsetsSoFar, entries) => [ ...subsetsSoFar.flatMap((result) => entries.map((entry) => result.concat([entry]))), ], [[]] ) const product2 = cartesianProduct(data)
native .reduce() with map, spread
function cartesianProductWithSpread(...allEntries) { return allEntries.reduce( (results, entries) => results .map(result => entries.map(entry => [...result, entry] )) .reduce((subResults, result) => [...subResults, ...result] , []), [[]] ) } const product3 = cartesianProductWithSpread(data)