Object Methods

Terminology

this

When used in an object, it refers back to the object so that you can access it's values from within

Object Method

Used on the object constructor (unlike array methods), they take the object as a parameter

Object.keys

• Returns an array of all the keys in an object

const dog = {
  name: "Kira",
  age: 4,
  breed: "White Shepard/Husky",
};
const keys = Object.keys(dog);
console.log(keys);
// will print out: ["name", "age", "breed"]

Object.values

• Returns an array of all the values in an object
• useful if you need to work with the data in an object and want to use array methods

const dog = {
  name: "Kira",
  age: 4,
  breed: "White Shepard/Husky",
};
const values = Object.values(dog);
console.log(values);
// will print out: ["kira", 4, "White Shepard/Husky"]

Object.entries

• Returns an array of arrays of all the keys and values in an object

const dog = {
  name: "Kira",
  age: 4,
  breed: "White Shepard/Husky",
};
const entries = Object.entries(dog);
console.log(entries);
// will print out: [["name", "kira"],["age", 4],["breed", "White Shepard/Husky"]]

Object.create

• Creates a new object linked to the prototype of an existing object
• Great for when you have a general object category and need specific variations
• example that's using the dog object in the past few slides to make a cat object
• This is a slightly more advanced method that you likely won't need for most cases, but this and others are good to be aware of because they do come in handy.

const cat = Object.create(dog);
cat.breed = "Calico";