Run results for: abcddef

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/52.0.2743.116 Chrome/52.0.2743.116 Safari/537.36

Browser: Chromium 52

Operating system: Ubuntu

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
clone object manually	2219569.0 Ops/sec
clone object native	2215846.0 Ops/sec
freeze	2707.9 Ops/sec

Script Preparation code:

function objClone(obj) {
  var index = 0,
    keys = Object.keys(obj),
    length = keys.length,
    key,
    result = {};

  for (; index < length; index += 1) {
    key = keys[index];
    result[key] = obj[key];
  }
  return result;
}

var testObj = {
  a: {
    b: {
      c: [1,2,4, {}, [4,2], {
        d: 4,
        e: {},
        f: [4,5,2],
      }]
    }
  }
};

Tests:

clone object manually
objClone(testObj)
clone object native
Object.assign({}, testObj);
freeze
Object.freeze(objClone)

clone object manually

clone object native

freeze