Benchmark: Object.keys for-of vs for-in hasOwnProperty

Script Preparation code:

// Declaring our Animal object
var Animal = function () {

    this.name = 'unknown';

    this.getName = function () {
        return this.name;
    }

    return this;
};

// Declaring our Dog object
var Dog = function () {

    // A private variable here        
    var private = 42;

    // overriding the name
    this.name = "Bello";

    // Implementing ".bark()"
    this.bark = function () {
        return 'MEOW';
    }  

    return this;
};


// Dog extends animal
Dog.prototype = new Animal();

// Creating an instance of Dog.
var obj = new Dog();

function iterateA() {
  var ret = "";
    
  for (var prop in obj) {
    if( obj.hasOwnProperty( prop ) ) {
      ret += obj[prop];
    } 
  }
    
  return ret;
}

function iterateB() {
  var ret = "";
    
  for (var prop of Object.keys(obj)) {
      ret += obj[prop];
  }

  return ret;
}

Tests:

A
var tmp = iterateA();
B
var tmp = iterateB();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
A
B

Fastest: N/A

Slowest: N/A

Latest run results:

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Related benchmarks:

Object.keys for-of vs for-in hasOwnProperty (version: 0)

Original source: https://jsperf.com/object-keys-foreach-vs-for-in-hasownproperty

Comparing performance of: A vs B

Created: 3 years ago by: Guest

Jump to the latest result

A

B

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results