Run results for: deepclone vs deepfreeze vs saferdeepclone2

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0

Browser: Firefox 121

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Lodash cloneDeep	1352551.8 Ops/sec
Json clone	658249.2 Ops/sec
freeze and destructure	5454291.5 Ops/sec
deepClone	10166412.0 Ops/sec
deepFreeze	3385820.5 Ops/sec
deepCloneSafe	9719253.0 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 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...'
  }
};

function deepFreeze(object) {
    for (const v of Array.isArray(object) ? object : Object.values(object)) {
        if (v && typeof v === 'object') {
            deepFreeze(v);
        }
    }
    Object.freeze(object);
    return object;
}

function deepClone(object) {
    if (Array.isArray(object)) {
      const len = object.length;
      const result = new Array(len);
      for (let i = 0; i < len; ++i) {
        const v = object[i];
        result[i] = v && typeof v === 'object' ? deepClone(v) : v;
      }
      return result;
    } else {
      const result = {};
      for (const k in object) {
        const v = object[k];
        result[k] = v && typeof v === 'object' ? deepClone(v) : v;
      }
      return result;
    }
}
function deepCloneSafe(object) {
    if (!object) {
        return object;
    }
    if (typeof object !== 'object') {
        // this is not an array or an object, it's a primitive...
        // having a type system doesn't 100% prevent this...
        return object;
    }
    // also.. hopefully nobody ever uses `new String('a')` or `new Number(1)`
    // but protect against that edge case anyways..
    if (typeof object.valueOf() !== 'object') {
        return new (object.constructor)(object.valueOf());
    }
    if (Array.isArray(object)) {
      const len = object.length;
      const result = new Array(len);
      for (let i = 0; i < len; ++i) {
        const v = object[i];
        result[i] = v && typeof v === 'object' ? deepCloneSafe(v) : v;
      }
      return result;
    } else {
      const result = {};
      for (const k in object) {
        const v = object[k];
        result[k] = v && typeof v === 'object' ? deepCloneSafe(v) : v;
      }
      return result;
    }
}

var myCopy = null;

Tests:

Lodash cloneDeep
myCopy = _.cloneDeep(MyObject);
Json clone
myCopy = JSON.parse(JSON.stringify(MyObject));
freeze and destructure
Object.freeze(MyObject); myCopy = { ...MyObject };
deepClone
myCopy = deepClone(MyObject)
deepFreeze
deepFreeze(MyObject); myCopy = MyObject
deepCloneSafe
myCopy = deepCloneSafe(MyObject)

Run results for: deepclone vs deepfreeze vs saferdeepclone2

Make deepclone safer, but check that it's not too much slower.

Lodash cloneDeep

Json clone

freeze and destructure

deepClone

deepFreeze

deepCloneSafe