Benchmark: Clone objects - MeasureThat.net

Script Preparation code:

var obj = {};
var objCount = 100;

for (let i = 0; i < objCount; i++) {
    obj[i] = [1, 2, 3];
}

function deepClone(objIn) {
    let copy;

    if (objIn === null || typeof objIn !== 'object') {
        return obj;
    }

    if (objIn instanceof Array) {
        copy = [];
        for (let i = 0, len = objIn.length; i < len; i++) {
            copy[i] = deepClone(objIn[i]);
        }
        return copy;
    }

    if (objIn instanceof Object) {
        copy = {};
        for (const attr in objIn) {
            if (objIn.hasOwnProperty(attr)) {
                copy[attr] = deepClone(objIn[attr]);
            }
        }
        return copy;
    }

}

function deepMerge(target, ...sources) {
 if (!sources.length) return target
 const source = sources.shift()

 if (isObject(target) && isObject(source)) {
  for (const key in source) {
   if (isObject(source[key])) {
    if (!target[key]) Object.assign(target, {[key]: {}})
    deepMerge(target[key], source[key])
   } else {
    Object.assign(target, {[key]: source[key]})
   }
  }
 }

 return deepMerge(target, ...sources)
}

function isObject(obj) {
 return obj && typeof obj === "object" && !Array.isArray(obj) 
}

Tests:

DeepClone
var clone = deepClone(obj);
JSON.stringify
var clone = JSON.parse(JSON.stringify(obj));
deepMerge
var clone = deepMerge({}, obj)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
DeepClone
JSON.stringify
deepMerge

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
DeepClone	215411.1 Ops/sec
JSON.stringify	112040.7 Ops/sec
deepMerge	35537.2 Ops/sec

Related benchmarks:

Clone objects (version: 1)

Comparing performance of: DeepClone vs JSON.stringify vs deepMerge

Created: one year ago by: Registered User

Jump to the latest result

DeepClone

JSON.stringify

deepMerge

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A