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Run results for:
reduce.concat() vs flat() vs concat + spread vs reduce + spread
Compare the new ES6 spread operator with the traditional concat() method
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<iframe src="https://measurethat.net/Embed?id=491561" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Browser:
Chrome 120
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
Benchmark engine:
Benchmark.js
reduce + spread
17.0M/s
concat + spread
9.3M/s
reduce + Array.prototype.concat
8.3M/s
Array.prototype.flat
2.5M/s
View exact numbers
Test name
Executions per second
✓
reduce + spread
17,036,740 Ops/sec
concat + spread
9,263,476 Ops/sec
reduce + Array.prototype.concat
8,342,208 Ops/sec
Array.prototype.flat
2,543,126 Ops/sec
Tests:
reduce + Array.prototype.concat
var params = [[ 1, 2 ], [ "hello", true, 7 ]]; var other = params.reduce((acc, val) => acc.concat(val), []);
Array.prototype.flat
var params = [[ 1, 2 ], [ "hello", true, 7 ]]; var other = params.flat();
concat + spread
var params = [[ 1, 2 ], [ "hello", true, 7 ]]; var other = [].concat(...params);
reduce + spread
var params = [[ 1, 2 ], [ "hello", true, 7 ]]; var other = params.reduce((acc, val) => { acc.push(...val); return acc; }, []);