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JavaScript has different types of data:
Example: Declaring Different Data Types
let name = "Alice";
// String let age = 30;
Number let isStudent = true;
//
Boolean
let colors = ["Red", "Green", "Blue"];
// Array
1.JavaScript Where To?
JavaScript Data Types
JavaScript has different types of data:
Example: Declaring Different Data Types
let name = "Alice"; // String
let age = 30; //Number
let isStudent = true; // Boolean
let colors = ["Red", "Green", "Blue"]; // Array
let person = {
firstName: "John",
lastName: "Doe"
}; // Object
JavaScript Objects:
What is an Object?
An object in JavaScript is a collection of related data stored in key-value
pairs. Instead of keeping multiple separate variables, an object groups related
properties together.
Think of an object like a real-world thing. For example, a car has properties
likebrand, model, and color.
How to Create an Object
There are two ways to create an object:
* Using an Object Literal {}
* Using the new Object() Constructor
Method 1: Object Literal (Recommended)
let car = {
brand: "Toyota",
model: "Camry",
year: 2022
};
Method 2: Object Constructor (Less Common)
let car = new Object();
car.brand = "Toyota";
car.model = "Camry";
car.year = 2022;
How to Access Object Properties
There are two ways to get the values inside an object:
* Dot notation .
* Bracket notation []
Example:
document.write(car.brand); //
Toyota document.write(car["model"]); // Camry Modifying an Object
You can add, update, or delete object properties.
car.color = "Red"; // Add new property car.year = 2023; // Update existing
property delete car.model; // Remove a property
Objects with Methods (Functions inside Objects)
Objects can have functions inside them.
These functions are called methods.
let person = {
name: "Lee Bliss",
greet: function() {
return "Hello, my name is " + this.name;
}
};
document.write(person.greet()); // Output: Hello, my name is Lee Bliss
Try It Out: JavaScript Object in an HTML File
<!DOCTYPE html>
<html>
<head>
<title>Title of thePage</title>
</head>
<body>
<h1>JavaScript Objects</h1>
<p id="output"></p>
<script>
let student = {
name: "Alice",
age: 20,
subjects: ["Math", "Physics", "Computer Science"],
greet: function() {
return `Hello, my name is ${this.name} and I study ${this.subjects.length} subjects.`;
}
};
document.getElementById("output").innerHTML = student.greet();
</script>
</body>
</html>
Output:
Title of thePage
JavaScript Objects
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