Run results for: Lodash cloneDeep vs JSON Clone vs Ramda Clone vs old school unroll vs hand rolled vs spread vs obj.assign

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser: Chrome 129

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

spread

8.9M/s

manual stack

1.8M/s

Ramda clone

1.8M/s

og hand rolled (still recursive)

1.5M/s

obj.assign

1.4M/s

hand rolled

1.0M/s

Lodash cloneDeep

885K/s

Json clone

829K/s

View exact numbers

Test name	Executions per second
✓ spread	8,941,401 Ops/sec
manual stack	1,830,844 Ops/sec
Ramda clone	1,790,031 Ops/sec
og hand rolled (still recursive)	1,500,549 Ops/sec
obj.assign	1,351,528 Ops/sec
hand rolled	1,008,505 Ops/sec
Lodash cloneDeep	885,176 Ops/sec
Json clone	828,992 Ops/sec

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.min.js"></script>

Script Preparation code:

var MyObject = {
  description: 'Creates a deep copy of source, which should be an object or an array.',
  myNumber: 123456789,
  myBoolean: true,
  jayson: {
    stringify: 'JSON.stringify() method converts a JavaScript value to a JSON string....',
    parse: 'JSON.parse() method parses a JSON string...'
  }
};

var myCopy = null;

Tests:

Lodash cloneDeep
myCopy = _.cloneDeep(MyObject);
Json clone
myCopy = JSON.parse(JSON.stringify(MyObject));
Ramda clone
myCopy = R.clone(MyObject);
hand rolled
const cp=(obj)=>"object" === typeof obj ? Object.fromEntries(Object.entries(obj).map(([k,v])=>[k,cp(v)])) : obj myCopy = cp(MyObject)
spread
myCopy = {...MyObject}
obj.assign
myCopy = Object.assign({}, MyObject)
og hand rolled (still recursive)
const cp_old=(obj)=>{ if ("object" !== typeof obj) { return obj } else { const entries = Object.entries(obj) for(let i = 0; i < entries.length; i++) { entries[i][2] = cp_old(entries[i][2]) } return Object.fromEntries(entries) } } myCopy = cp_old(MyObject)
manual stack
const cp_stack=(obj)=>{ if ("object" !== typeof obj) { return obj } else { const stack = [] let entries = Object.entries(obj) let i=0 stackloop: while(true) { for(; i < entries.length; i++) { const entry = entries[i][2] if ("object" !== typeof entry) continue else { stack.push([i,entries]) entries = Object.entries(entries[i][2]) i = 0 continue stackloop } } if (stack.length === 0) break [i, entries] = stack.pop() } return Object.fromEntries(entries) } } myCopy = cp_stack(MyObject)