Run results for: JavaScript shallow copy spread operator, deep reference vs shallow reference

Run details:

User agent: Mozilla/5.0 (Linux; Android 12; 2107113SG) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 108

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
Using the spread operator with deep reference	8685487.0 Ops/sec
Using the spread operator with shallow reference	8568885.0 Ops/sec

Tests:

Using the spread operator with deep reference
const objectToCopy = { objectlevel2: { sampleString1: 'Hello world', sampleNumber1: 123456789, sampleArray1: ['hello', 'world', 'how', 'are', 'you'], sampleString2: 'Hello world', sampleNumber2: 123456789, sampleArray2: ['hello', 'world', 'how', 'are', 'you'], sampleString3: 'Hello world', sampleNumber3: 123456789, sampleArray3: ['hello', 'world', 'how', 'are', 'you'], sampleString4: 'Hello world', sampleNumber4: 123456789, sampleArray4: ['hello', 'world', 'how', 'are', 'you'], sampleString5: 'Hello world', sampleNumber5: 123456789, sampleArray5: ['hello', 'world', 'how', 'are', 'you'], sampleString6: 'Hello world', sampleNumber6: 123456789, sampleArray6: ['hello', 'world', 'how', 'are', 'you'], sampleString7: 'Hello world', sampleNumber7: 123456789, sampleArray7: ['hello', 'world', 'how', 'are', 'you'], sampleString8: 'Hello world', sampleNumber8: 123456789, sampleArray8: ['hello', 'world', 'how', 'are', 'you'], sampleString9: 'Hello world', sampleNumber9: 123456789, sampleArray9: ['hello', 'world', 'how', 'are', 'you'], sampleString10: 'Hello world', sampleNumber10: 123456789, sampleArray10: ['hello', 'world', 'how', 'are', 'you'], } } const finalObject = {...objectToCopy.objectlevel2};
Using the spread operator with shallow reference
const objectToCopy = { objectlevel2: { sampleString1: 'Hello world', sampleNumber1: 123456789, sampleArray1: ['hello', 'world', 'how', 'are', 'you'], sampleString2: 'Hello world', sampleNumber2: 123456789, sampleArray2: ['hello', 'world', 'how', 'are', 'you'], sampleString3: 'Hello world', sampleNumber3: 123456789, sampleArray3: ['hello', 'world', 'how', 'are', 'you'], sampleString4: 'Hello world', sampleNumber4: 123456789, sampleArray4: ['hello', 'world', 'how', 'are', 'you'], sampleString5: 'Hello world', sampleNumber5: 123456789, sampleArray5: ['hello', 'world', 'how', 'are', 'you'], sampleString6: 'Hello world', sampleNumber6: 123456789, sampleArray6: ['hello', 'world', 'how', 'are', 'you'], sampleString7: 'Hello world', sampleNumber7: 123456789, sampleArray7: ['hello', 'world', 'how', 'are', 'you'], sampleString8: 'Hello world', sampleNumber8: 123456789, sampleArray8: ['hello', 'world', 'how', 'are', 'you'], sampleString9: 'Hello world', sampleNumber9: 123456789, sampleArray9: ['hello', 'world', 'how', 'are', 'you'], sampleString10: 'Hello world', sampleNumber10: 123456789, sampleArray10: ['hello', 'world', 'how', 'are', 'you'], } } const removeDepth = objectToCopy.objectlevel2 const finalObject = {...removeDepth};

Run results for: JavaScript shallow copy spread operator, deep reference vs shallow reference

Using the spread operator with deep reference

Using the spread operator with shallow reference