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Getting Started

What JavaScript Actually Does

Running Your First Line of Code

Values and Variables

Storing Data with let and const

The Core Data Types

Check: Variables and Types

Check: Strings vs Numbers

Logic and Control Flow

Comparing Values and Combining Conditions

Making Decisions with if and else

Repeating Work with Loops

Check: Conditions and Loops

Check: Equality

Functions and Data

Writing Reusable Functions

Grouping Data with Arrays and Objects

Check: Functions

Check: Arrays

Vocabulary Recap

A hands-on introduction to JavaScript for complete beginners. Learn variables, data types, conditions, loops, functions, arrays and objects by running real code in your browser console.

Go from zero to writing small programs that make decisions, repeat work and organize data. Every idea comes with code you can paste into your browser console and run right now.

JavaScript Basics: Your First Working Programs

<div class="simple-box-wrapper"> <div class="simple-box"> <div class="column"> <h3>Description</h3> <div class="ck-horizontal-line"><hr></div> <p>I'm a paragraph. Click to start writing that will inform, inspire, or encourage your community. We know you have so many things to share with the world. Happy editing!</p> </div> </div> </div>