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Asynchronous JS
Promises, async/await, fetch, and timing
Promisesasync/awaitfetch
Practise JavaScript by topic.
Choose interactive JavaScript exercises for the exact skill you want to strengthen, from fundamentals to DOM manipulation.
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, and formatting
29 exercisesmedium focus12 premium
Arrays
Iteration, mapping, and array methods
26 exerciseseasy focus18 premium
Objects
Properties, prototypes, and object patterns
20 exerciseseasy focus11 premium
Functions
Callbacks, scopes, and functional programming
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
Document Object Model rendering and events
80 exercisesmedium focus40 premium
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.