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- 2. What is JavaScript? • Programming language for web • Runs in browsers and servers (Node.js) • Adds interactivity to websites
- 3. History of JavaScript • Created by Brendan Eich in 1995 • Originally called Mocha, then LiveScript • Standardized as ECMAScript
- 4. JavaScript Features • Python • JavaScript • Java • C++ • Ruby • Lightweight, interpreted • Dynamically typed • Object-oriented and functional • Event-driven
- 5. How JavaScript Works • Client-side scripting • Embedded in HTML with <script> tag • Executed by browser’s JavaScript engine
- 6. Primitive Data Types These hold a single value and are immutable. • Number • Represents both integers and floating-point numbers. • Example: 42, 3.14 • String • Sequence of characters enclosed in quotes. • Example: "Hello", 'JavaScript' • Boolean • Logical entity that can be either true or false. • Undefined • A variable declared but not assigned a value. • Example: let a; // a is undefined • Null • Represents no value or empty value explicitly. • Example: let b = null; • Symbol (ES6) • Unique and immutable value used as an identifier for object properties. Data Types in JavaScript Non-Primitive Data Type • Object • Collection of key-value pairs; can store multiple values and more complex entities like arrays, functions, etc.
- 7. Operators • Arithmetic, Assignment • Comparison • Logical (&&, ||, !) • Ternary (? :) • Bitwise and typeof
- 8. • Function declaration vs expression • Arrow functions (()=>) • Parameters, default values • Return statements • Callback functions Functions
- 9. Objects • Object literals • Accessing and modifying properties • Nested objects • this keyword • Object methods