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JavaScript basics
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  • Course
  • Cs101
  • Institution
  • Anna University Chennai

JavaScript is a versatile programming language for web development, used to create interactive effects within browsers. Key features include variable declarations, functions, event handling, and DOM manipulation.

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Document information

  • October 18, 2024
  • 3
  • 2024/2025
  • Class notes
  • Won notes
  • All classes

Subjects

  • java
  • javascript basics
  • javascript
  • js202
  • cs101
  • js

Written for

  • Anna University Chennai
  • Cs101
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JavaScript Basics


Colour … : Example codes

1. JavaScript Basics

 Variables: Used to store data values.
o Declared using var, let, or const.
o Example:

js

let age = 25;
const pi = 3.14;

 Data Types: JavaScript has several data types such as:
o Primitive: string, number, boolean, null, undefined, symbol.
o Non-primitive: objects (arrays, objects).

2. Functions

 Functions allow you to encapsulate code for reusability.
o Syntax:

js

function greet(name) {
return `Hello, ${name}`;
}

 Arrow Functions (ES6):

js

const greet = (name) => `Hello, ${name}`;

3. Control Structures

 Conditional Statements: if, else if, else, and switch.

js

if (age >= 18) {
console.log("Adult");
} else {
console.log("Minor");
}

 Loops: for, while, do...while.

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