freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/object-oriented-programming/iterate-over-all-properties/index.md

title
Iterate Over All Properties

Iterate Over All Properties

Method

The method is to use a for-in-loop to iterate through every property in the object. Inside the loop you then check if the property is a own-property or a prototype and place it in the ownProps[] array or the prototypeProps[] array. Remember to push properties to the beagle object and not the Dog object to pass all test cases.

Solution

function Dog(name) {
  this.name = name;
}

Dog.prototype.numLegs = 4;

let beagle = new Dog("Snoopy");

let ownProps = [];
let prototypeProps = [];

// Add your code below this line 
for (let property in beagle) {
  if(Dog.hasOwnProperty(property)) {
    ownProps.push(property)
  }
  else {
    prototypeProps.push(property)
  }
}