Learn JavaScript

Run your first JavaScript, and learn values, variables, types and operators.

• Introduction to JavaScript
• Running JavaScript
• Your First Program
• Syntax and Comments
• Variables: let, const and var
• Data Types
• Numbers and Math
• Strings and Template Literals
• Type Conversion
• Operators
• Comparisons, Truthy and Falsy

Make decisions with conditions and repeat work with loops.

• if, else and Ternary
• switch
• Loops: for, while, do...while
• for...of and for...in
• break and continue

Write reusable functions, use arrow functions and callbacks, and understand scope and closures.

• Functions
• Parameters, Defaults and Rest
• Arrow Functions
• Scope and Hoisting
• Closures
• Callbacks and Higher-Order Functions

Store and transform collections with arrays, objects, Maps and Sets, and work with JSON and dates.

• Arrays
• Array Methods: map, filter, reduce
• Objects
• Destructuring and Spread
• Map and Set
• JSON
• Dates and Times

Make web pages interactive: find and change elements, respond to events, handle forms and save data in the browser.

• Introduction to the DOM
• Selecting Elements
• Changing Content and Classes
• Creating and Removing Elements
• Events
• Handling Forms
• Bubbling and Delegation
• localStorage and sessionStorage

Understand the event loop, then use promises, async/await and fetch to work with timers and APIs.

• Async Code and the Event Loop
• Promises
• async and await
• Fetching Data from APIs

Errors, classes, this, prototypes, modules, iterators and modern syntax.

• Error Handling
• Classes
• Inheritance
• this, call, apply and bind
• Prototypes
• Modules: import and export
• Iterators and Generators
• Regular Expressions
• Modern JavaScript Features

Run JavaScript outside the browser with Node.js and manage packages with npm.

• Node.js Basics
• npm and Packages

Questions and coding challenges asked in front-end, full-stack and web developer interviews.

• Beginner Questions
• Intermediate Questions
• Advanced Questions
• Coding Challenges