Run results for: Lodash clone vs concat vs unshift vs stringify vs slice vs while loop

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36

Browser: Chrome 70

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Lodash clone	1584529.2 Ops/sec
Native concat	2048635.2 Ops/sec
Native unshift	1078564.0 Ops/sec
Native Stringify	110391.1 Ops/sec
Native slice	3585410.0 Ops/sec
Native slice at 0	3489532.5 Ops/sec
While Loop	1235257.5 Ops/sec

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var testArray = [{
  description: 'Random description.',
  testNumber: 123456789,
  testBoolean: true,
  testObject: {
    testString: 'test string',
    testNumber: 12345
  },
  testArray: [{
    myName: 'test name',
    myNumber: 123245
  }]
},{
  description: 'Random description.',
  testNumber: 123456789,
  testBoolean: true,
  testObject: {
    testString: 'test string',
    testNumber: 12345
  },
  testArray: [{
    myName: 'test name',
    myNumber: 123245
  }]
}];

var testCopy = null;

Tests:

Lodash clone
testCopy = _.clone(testArray);
Native concat
testCopy = [].concat(testArray);
Native unshift
testCopy = []; for (var i = testArray.length; i--;) { testCopy.unshift(testArray[i]); }
Native Stringify
testCopy = JSON.parse(JSON.stringify(testArray));
Native slice
testCopy = testArray.slice();
Native slice at 0
testCopy = testArray.slice(0);
While Loop
testCopy = []; i = testArray.length; while(i--) testCopy[i] = testArray[i];

Run results for: Lodash clone vs concat vs unshift vs stringify vs slice vs while loop

compare shallow array copy/clone methods

Lodash clone

Native concat

Native unshift

Native Stringify

Native slice

Native slice at 0

While Loop