Syllabus

Objective

Learn the fundamentals of JavaScript including variables, data types, operators, conditionals, loops, and a Git/GitHub introduction.

1. Introduction to JavaScript

• JavaScript is a high-level, interpreted programming language.
• Runs in:
  • Browsers (client-side rendering)
  • Node.js (server-side rendering)
• Popular for full-stack development (React + Node.js)

2. Variables: var, let, const

A JavaScript identifier usually starts with a letter, underscore (_), or dollar sign ($). Subsequent characters can also be digits (0 – 9). Because JavaScript is case sensitive, letters include the characters A through Z (uppercase) as well as a through z (lowercase).

Some examples of legal names are Number_hits, temp99, $credit, and _name.

Declaration

JavaScript has three kinds of variable declarations.

• [var](<https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/var>) : Declares a variable, optionally initializing it to a value.
• let : Declares a block-scoped, local variable, optionally initializing it to a value.
• const : Declares a block-scoped, read-only named constant.