Run results for: assign comparison

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.129 Safari/537.36

Browser: Chrome 81

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
spread	1725.3 Ops/sec
assign	1029.7 Ops/sec

Script Preparation code:

var arr = [];
var result = [];
for (var i = 0; i < 1000; i++) {
  arr[i] = Math.random();
}

Tests:

spread
for (var i = 0, len = arr.length; i < len; i++) { const firstObject = { sampleData: 'Hello world', sampleData1: 'Hello world', sampleData2: 'Hello world', sampleData3: 'Hello world' }; result.push({...firstObject, isCloseTag: true}); }
assign
for (var i = 0, len = arr.length; i < len; i++) { const firstObject = { sampleData: 'Hello world', sampleData1: 'Hello world', sampleData2: 'Hello world', sampleData3: 'Hello world' }; result.push(Object.assign({firstObject, isCloseTag: true})); }
spread new
for (var i = 0, len = arr.length; i < len; i++) { const firstObject = { sampleData: 'Hello world', sampleData1: 'Hello world', sampleData2: 'Hello world', sampleData3: 'Hello world' }; const newObject = {...firstObject}; newObject.isCloseTag = true; result.push(newObject); }