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Asynchronous JS
Promises, async/await, fetch, and timing
Promisesasync/awaitfetch
Interactive JavaScript exercises by topic.
Practice with focused coding challenges that run in your browser. Write a solution, run the tests, and use instant feedback to improve it.
Topic library
Choose a JavaScript exercise category.
Start with core language drills or focus on strings, arrays, objects, functions, scope, and browser interaction. Each live set shows its size and difficulty mix before you begin.
Foundations
Variables, conditions, and basic logic
73 exercisesbeginner focus22 premium
Strings
Text manipulation, methods, formatting, and parsing
29 exercisesmedium focus12 premium
Arrays
Indexing, array operations, iteration, and algorithms
26 exerciseseasy focus18 premium
Objects
Properties, nested data, and object patterns
20 exerciseseasy focus11 premium
Functions
Parameters, returns, callbacks, recursion, and composition
27 exerciseshard focus16 premium
Higher Order Functions
map, filter, reduce, and composing behaviour
56 exercisesmedium focus12 premium
Closures & Scope
Lexical scope, closures, and private state
20 exercisesmedium focus4 premium
DOM Manipulation
Element selection, events, rendering, forms, and browser APIs
80 exercisesmedium focus40 premium
How it works
A focused way to practice JavaScript online.
These interactive JavaScript exercises keep the feedback loop short. Work on one concept at a time, check what your code actually does, and revise the parts that do not behave as expected.
Choose one skill
Start with fundamentals or jump directly to strings, arrays, objects, functions, scope, or DOM manipulation.
Write real JavaScript
Solve each coding challenge in the browser editor without setting up a local project or switching tools.
Run tests and improve
Use immediate test feedback to find incorrect assumptions, adjust your solution, and try again.
Skills you will use
What you will practice in these JavaScript exercises.
Build fluency with JavaScript fundamentals including variables, data types, operators, conditions, loops, and basic program logic. Then move into strings, arrays, objects, functions, callbacks, higher-order functions, scope, closures, and DOM manipulation.
These JavaScript coding exercises include practical tasks such as formatting text, transforming application data, validating values, writing reusable functions, debugging incorrect behaviour, responding to browser events, and updating page content. Each challenge asks you to produce working code and choose an approach that fits the result the program needs.
Where to start
Pick the practice that matches what you know.
You do not need to work through every category in order. Begin with the smallest gap in your understanding, then move into a nearby topic when the exercises start to feel familiar.
Common questions
JavaScript exercise FAQs.
- What are JavaScript exercises?
- They are focused coding challenges that ask you to read a task, write JavaScript, and check the result. They turn language concepts into decisions you can practice and repeat.
- Are these exercises suitable for beginners?
- Yes. The Foundations category begins with variables and values, then builds toward conditions, loops, functions, and everyday program logic.
- Do I need to install anything?
- No. Exercises run in the browser with an editor and test feedback. For unstructured experimentation, use the JavaScript sandbox.
- Can I learn in a guided order instead?
- Yes. The JavaScript courses provide a sequenced path with explanations, exercises, quizzes, and projects when topic-by-topic practice is not enough.
Prefer a path?
Want more structure than topic drills?
Follow a guided course when you want sequence, or build a project when you are ready to connect the pieces in one browser app.