Lesson 10 of 20By Taha Sufiyan
Last updated on Aug 3, 20202403JavaScript is an open-source programming language. It is designed for creating web-centric applications. It is lightweight and interpreted which makes it much faster than other languages. JavaScript is integrated with HTML, and so it becomes easier to implement JavaScript in web applications.
In this Introduction to JavaScript Objects article, we will get familiar with the implementation of objects in a JavaScript web application. You’ll understand what JavaScript objects are and various ways of accessing them, along with their manipulation.
JavaScript is absolutely essential for web development. So if you’ve ever thought about choosing that career path, you’d surely have come across this language. And probably, that’s why you are here in the first place. So let’s quickly get started without wasting any more time!
Here is the topic that we’ll be talking about in this JavaScript Objects article:
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JavaScript is an object-oriented programming language, so everything in JavaScript is an object. |
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A JavaScript object is like a real-world entity having state and behavior, for example, a car. We can take a car as an object. It will have a state like color and model. It will also have behaviors like accelerating and brake. |
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JavaScript is template based and we can create objects without the need of having a class. Generally, an object is accompanied by a class that defines an object’s blueprints but JavaScript doesn’t require any class to be defined for objects |
There are three ways in which we can create a JavaScript object. Let’s go through each method:
<script>
var student = {
name: "Chris Hemsworth",
age: 21,
branch: "Computer Science",
};
document.getElementById("demo").innerHTML = student.name + " of the age " + student.age + " studies " + student.branch + ".";
</script>
<script>
var student = new Object();
student.name = "Chris Hemsworth";
student.age = 21;
student.branch = "Computer Science";
document.getElementById("demo").innerHTML = student.name + " of the age " + student.age + " studies " + student.branch + ".";
</script>
<script>
function stud(name, age, branch) {
this.name = name;
this.age = age;
this.branch = branch;
}
var student = stud("Chris Hemsworth", 21, "Computer Science");
document.getElementById("demo").innerHTML = student.name + " of the age " + student.age + " studies " + student.branch + ".";
</script>
A JavaScript object is basically a collection of unordered properties. Values associated with a JavaScript object are called its properties. Properties can usually be added, updated, and deleted, excluding read-only properties.
Let’s now look at the few ways for accessing object properties:
<!--ways to access properties of objects-->
<script>
var student = {
name: "Chris Hemsworth",
age: 21,
branch: "Computer Science",
};
//first method
student.age;
//second method
student[age];
//third method
x = "age";
student[x];
</script>
Actions that can be performed on a JavaScript object are called methods.
<script>
let user = {
name: "Chris",
age: 24,
};
// create a new function that we will use as an object method
function sayHi() {
alert("Hello!");
}
// then add the previously created method
user.sayHi = sayHi;
// this will print username on the screen
document.getElementById("demo").innerHTML = "Hi " + user.name;
//user.sayHi(); // this will create an alert, Hello!
document.getElementById("click me").onclick = user.sayHi;
</script>
Getters and setters allow the defining of object accessors.
<!--JavaScript getter-->
<script>
// Create an object:
var car = {
model: "BMW 320d",
color: "Navy Blue",
fuel_type: "Diesel",
get fuel() {
return this.fuel_type;
},
};
// Display data from the object using a getter:
document.getElementById("demo").innerHTML = car.fuel;
</script>
<script>
var car = {
model: "Audi A4",
color: "Bright Red",
fuel_type: "",
set fuel(fuel) {
this.fuel_type = fuel;
},
};
// Set an object property using a setter:
car.fuel = "Petrol";
// Display data from the object:
document.getElementById("demo").innerHTML = car.fuel_type;
</script>
I hope you are now familiar with JavaScript objects and excited enough to start learning more about it right away!
Objects are a crucial part of any Object-oriented programming language. So it is important to know the ins and outs of this concept properly. Taking the time to learn about JavaScript objects will help you in getting ready for real-world applications and for the interviews as well.
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Do you have any questions for us? Please mention it in the comments section of "An Introduction to JavaScript" article and we'll have our experts answer it for you.
Taha is a Research Analyst at Simplilearn. He is passionate about building great user interfaces and keeps himself updated on the world of Artificial Intelligence. Taha is also interested in gaming and photography.
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