Run results for: Array.prototype.concat vs spread operator vs flat

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/114.0.5735.124 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 114

Operating system: iOS 16.5

Device Platform: Mobile

Date tested: 10 months ago

Test name	Executions per second
Array.prototype.concat	43940840.0 Ops/sec
spread operator	493830300.0 Ops/sec
Array.prototype.flat	15177970.0 Ops/sec

Tests:

Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
Array.prototype.flat
var params = [ "hello", true, 7 ]; var other = [1, 2, params].flat()

Run results for: Array.prototype.concat vs spread operator vs flat

Compare the new ES6 spread operator with the traditional concat() method

Array.prototype.concat

spread operator

Array.prototype.flat