Run results for: Spread vs object.assign vs immutable

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.108 Safari/537.36

Browser: Chrome 74

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
spread (objects)	406697.5 Ops/sec
object assign (objects)	169016.8 Ops/sec
Immutable fromJS (objects)	26502.5 Ops/sec
spread (arrays)	94001.8 Ops/sec
object assign (arrays)	12553.4 Ops/sec
Immutable merge (arrays)	235697.5 Ops/sec

HTML Preparation code:

<script type='text/javascript' src='https://cdnjs.cloudflare.com/ajax/libs/immutable/4.0.0-rc.12/immutable.min.js'></script>

Script Preparation code:

var x = ["asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw", "asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw"];
var y = ["asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw", "asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw","asdasdasda", "adasdasddsa", "asdasdasdasd", "asdasdasdasdasd", "asdasdaqwqw"];
var z = "xDDD";
var ob = {
  "a": 12, 
  "b": {
    "asd": "asd",
    "asdasdasdasd": 44
  },
  "c": {
    "d": {
      "asdasd": "asd",
      "qwqwqw": "asdasdasd",
      "c": {
        "d": {
          "asdasd": "asd",
          "qwqwqw": "asdasdasd"
        }
  	  }
    }
  }
};

var ob1 = {
  "a": 12, 
  "b": {
    "asd": "asd",
    "asdasdasdasd": 44
  },
  "c": {
    "d": {
      "asdasd": "asd",
      "qwqwqw": "asdasdasd",
      "c": {
        "d": {
          "asdasd": "asd",
          "qwqwqw": "asdasdasd"
        }
  	  }
    }
  }
};

Tests:

spread (objects)
var a = {...ob, ...ob1, z};
object assign (objects)
var a = Object.assign({}, ob, ob1, z);
Immutable fromJS (objects)
var a = Immutable.fromJS({ob, ob1, z})
spread (arrays)
var a = [...x, ...y]
object assign (arrays)
var a = Object.assign([], x, y);
Immutable merge (arrays)
var a = Immutable.merge(ob, ob1)

Run results for: Spread vs object.assign vs immutable

spread (objects)

object assign (objects)

Immutable fromJS (objects)

spread (arrays)

object assign (arrays)

Immutable merge (arrays)