Run results for: Spread operator vs Array.push vs array[lastIndex]

Run details:

User agent: Mozilla/5.0 (Linux; Android 8.0.0; ONEPLUS A3003 Build/OPR6.170623.013; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.158 Mobile Safari/537.36

Browser: Opera.170623.013; wv) applewebkit/537.36 (khtml, like gecko) version/4

Operating system: Android 8.0.0

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
Using spread operator	636665.0 Ops/sec
Using push function	4390889.0 Ops/sec
Add to last index of array	5048303.0 Ops/sec

Tests:

Using spread operator
const basicData = [{id: 1}, {id: 2}, {id: 3}]; const finalData = [...basicData, {id: 4}];
Using push function
var basicData = [{id: 1}, {id: 2}, {id: 3}]; basicData.push({id: 4});
Add to last index of array
var basicData = [{id: 1}, {id: 2}, {id: 3}]; basicData[basicData.length] = {id: 4};

Run results for: Spread operator vs Array.push vs array[lastIndex]

Using spread operator

Using push function

Add to last index of array