JavaScript Notes

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What is JavaScript?

JavaScript is a high-level, interpreted programming language used to create interactive and dynamic web applications.
It runs in browsers and on servers using environments like Node.js.

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Features of JavaScript

• Lightweight and interpreted
• Dynamically typed
• Event-driven
• Prototype-based object-oriented
• Single-threaded with asynchronous support
• Runs on client-side and server-side

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JavaScript Execution Model

1. Parsing of code
2. Creation of execution context
3. Code execution

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Variables

Declaration Keywords

var name = "Amber";      // function scoped (avoid)
let age = 22;            // block scoped
const isDev = true;      // block scoped, cannot be reassigned