Run results for: JavaScript fastest way to clone an object including JSON.parse and structuredClone methods

Test name	Executions per second
✓ Create new object from scratch	26,853,634 Ops/sec
Using the spread operator	20,839,704 Ops/sec
Manually copying properties	14,186,338 Ops/sec
Create new object while copying	14,072,360 Ops/sec
Using Object.assign	9,817,506 Ops/sec
JSON	3,566,618 Ops/sec
StructuredClone	1,156,254 Ops/sec

Using the spread operator

const firstObject = { 
  prop0: 'Hello world',
  prop1: 1,
  prop2: 2,
  prop3: "3",
  prop4: false,
  prop5: 0.2
};

const finalObject = {...firstObject};

Using Object.assign

const firstObject = { 
  prop0: 'Hello world',
  prop1: 1,
  prop2: 2,
  prop3: "3",
  prop4: false,
  prop5: 0.2
};

const finalObject = Object.assign({}, firstObject);

Manually copying properties

const firstObject = { 
  prop0: 'Hello world',
  prop1: 1,
  prop2: 2,
  prop3: "3",
  prop4: false,
  prop5: 0.2
};

let finalObject = {};
finalObject.prop0 = firstObject.prop0;
finalObject.prop1 = firstObject.prop1;
finalObject.prop2 = firstObject.prop2;
finalObject.prop3 = firstObject.prop3;
finalObject.prop4 = firstObject.prop4;
finalObject.prop5 = firstObject.prop5;

Create new object while copying

const firstObject = { 
  prop0: 'Hello world',
  prop1: 1,
  prop2: 2,
  prop3: "3",
  prop4: false,
  prop5: 0.2
};

const finalObject = { 
  prop0: firstObject.prop0,
  prop1: firstObject.prop1,
  prop2: firstObject.prop2,
  prop3: firstObject.prop3,
  prop4: firstObject.prop4,
  prop5: firstObject.prop5
};

Create new object from scratch

const firstObject = { 
  prop0: 'Hello world',
  prop1: 1,
  prop2: 2,
  prop3: "3",
  prop4: false,
  prop5: 0.2
};

const finalObject = { 
  prop0: 'Hello world',
  prop1: 1,
  prop2: 2,
  prop3: "3",
  prop4: false,
  prop5: 0.2
};

StructuredClone

const firstObject = { 
  prop0: 'Hello world',
  prop1: 1,
  prop2: 2,
  prop3: "3",
  prop4: false,
  prop5: 0.2
};

const finalObject = structuredClone(firstObject);

JSON

const firstObject = { 
  prop0: 'Hello world',
  prop1: 1,
  prop2: 2,
  prop3: "3",
  prop4: false,
  prop5: 0.2
};

const finalObject = JSON.parse(JSON.stringify(firstObject));