Benchmark: Medium-size Array concat vs spread operator vs push

Tests:

Array.prototype.concat
let a = (new Array(1e3)).fill(99); let b = (new Array(1e3)).fill(99); let c = (new Array(1e3)).fill(99); let d = (new Array(1e3)).fill(99); const combined = a.concat(b).concat(c).concat(d)
spread operator
let a = (new Array(1e3)).fill(99); let b = (new Array(1e3)).fill(99); let c = (new Array(1e3)).fill(99); let d = (new Array(1e3)).fill(99); const combined = [...a, ...b, ...c, ...d];
Push
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].push(...params); let a = (new Array(1e3)).fill(99); let b = (new Array(1e3)).fill(99); let c = (new Array(1e3)).fill(99); let d = (new Array(1e3)).fill(99); const combined = []; combined.push(...a); combined.push(...b); combined.push(...c); combined.push(...d);

Rendered benchmark preparation results:

Previous results

Latest run results:

Run details: (Test run date: 11 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36

Browser/OS: Chrome 141 on Mac OS X 10.15.7

Array.prototype.concat

93K/s

Push

82K/s

spread operator

72K/s

View exact numbers

Medium-size Array concat vs spread operator vs push (version: 1)