Test your knowledge with interactive quizzes.
From basic concepts to advanced development techniques.
Quiz on understanding console.log output in JavaScript: predicting code execution results, output behavior of different data types, asynchronous operations, closures, hoisting effects, and complex debugging scenarios.
20 Git questions from basics to advanced: indexing, branching, merge vs rebase, rollbacks, conflicts, reflog, bisect, tags, stash and safe force push.
Quiz on arrays in JavaScript: creation, methods, iteration, length, pitfalls, destructuring, spread operator and all basic concepts of working with arrays.
Basic quiz on asynchrony in JavaScript: Event Loop, promises, async/await, setTimeout, error handling and basic concepts of asynchronous programming.
Advanced quiz on asynchrony in JavaScript: microtasks, macrotasks, promise chains, error handling, patterns and nuances of working with Event Loop.
Quiz on data types in JavaScript: primitive types, objects, arrays, functions, typeof, type coercion, type comparison, Symbol, BigInt and all fundamental concepts of working with data types.
30-question quiz on JavaScript functions: from basic concepts to advanced topics — closures, context, generators, currying and optimizations.
Quiz on objects in JavaScript: creation, properties, methods, cloning, JSON.stringify, Object.keys, destructuring, prototypes and all fundamental concepts of working with objects.
Complete test on the fundamentals and advanced aspects of working with promises: theory, practice, common problems and optimal solutions.
Comprehensive test on strings in JavaScript: creation, methods, search, replace, regular expressions, template literals, Unicode encoding, internationalization and all fundamental concepts of working with strings.
Fundamentals and nuances of working with key concepts of scopes and the this keyword in JavaScript.
Comprehensive test on variables and data types in JavaScript: var, let, const, primitive types, objects, type conversion, scope, hoisting, Symbol, BigInt and all basic concepts of working with variables and data types.
Quiz on variables in JavaScript: var, let, const, scope, hoisting, temporal dead zone, global and local variables, closures, data types and all fundamental concepts of working with variables.
Comprehensive 50-question quiz: JSX and component basics, rendering and keys, hooks (useState, useEffect, useRef, useMemo, useCallback, useLayoutEffect, useId), context and optimization, forms, portals and fragments, Error Boundaries, Suspense and concurrent features (useTransition, useDeferredValue), RSC and SSR, hydration, streaming, routing, data handling, state management, performance, a11y, security and testing.
Soft skills test with interview questions for frontend developers: team communication, working with designers and products, conflict resolution, time management and professional development.
Comprehensive test on TypeScript basics: data types, interfaces, generics, classes, modules, utility types, conditional types and all fundamental concepts of working with TypeScript for Frontend developers.
20 questions from basics to advanced: cookie attributes (HttpOnly, Secure, SameSite), lifetime, domain/path, localStorage vs sessionStorage, events, quotas, and security.