01. Introduction to Objects

An object is a set of variables and functions that is used to create a model of something. The concept of viewing each model in programming comes from a paradigm called object-oriented programming.

Object-oriented programming

The aim of object-oriented programmingis to model objects in programming with variables and methods that describe its characteristics and what it can do.

Properties

Properties are object variables that describe the object. For example, pretend that the object we are describing is a car. To access that car's properties, we use the dot notation (aka member operator), followed by the property name.

car.color  // our car's color
car.make   // the make
car.model  // the model

Methods

An object can also have methods, which define how the object behaves. Our car may have a drive() or accelerate() function.

car.drive = function() {
  this.velocity = 60;  // km per hour
}

Here, the this keyword refers to the object to which the function belongs to. Thus, it's setting a particular object's own velocity to 60.

Build modern and responsive webpages

HTML & CSS

Build modern and responsive webpages Try Front-end

This book teaches HTML as if it's for anyone - hobbyists, students, and professionals - and it's full-color throughout. It utilizes information graphics and lifestyle photography to explain the topics in a simple way that is engaging. You can progress through the chapters from beginning to end or just dip into topics of particular interest at your leisure.

$ Check price
29.9929.99Amazon 4.5 logo(926+ reviews)

More Front-end resources

Aching back from coding all day?

Self-Massage Tool

Aching back from coding all day? Try Back Problems

Relieve spasms, tight muscles, trigger points and pressure points with the Body Back Buddy! This trigger point massage is designed to help you self-message any area of your body - especially those that are hard to reach. Keeping your muscles relaxes and out of contraction is importan in helping to reduce pain and prevent muscle injury.

$ Check price
29.9529.95Amazon 4.5 logo(3,443+ reviews)

More Back Problems resources

Ad