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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