Run results for: Array.prototype.concat vs spread operator - with Arrays of Objects (Updated Oct 2020)

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/102.0.5005.87 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 102

Operating system: iOS 15.5

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
Array.prototype.concat	17643870.0 Ops/sec
spread operator (spread at head)	23375750.0 Ops/sec
spread operator (spread at tail)	23330750.0 Ops/sec

Tests:

Array.prototype.concat
var params = [ { 'ten': 10 }, { 'six': 6 }, {'nested': { 'five': 5 }} ]; var other = [ { 'one': 1 }, { 'two': 2 } ].concat(params);
spread operator (spread at head)
var params = [ { 'ten': 10 }, { 'six': 6 }, {'nested': { 'five': 5 }} ]; var other = [ ...params, { 'one': 1 }, { 'two': 2 } ];
spread operator (spread at tail)
var params = [ { 'ten': 10 }, { 'six': 6 }, {'nested': { 'five': 5 }} ]; var other = [ { 'one': 1 }, { 'two': 2 }, ...params ];

Run results for: Array.prototype.concat vs spread operator - with Arrays of Objects (Updated Oct 2020)

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

Array.prototype.concat

spread operator (spread at head)

spread operator (spread at tail)