https://foxipa.com/en/javascript/exercise/quiz/ Test your JavaScript knowledge with focused quiz exercises. Hugo en-US https://foxipa.com/en/javascript/exercise/quiz/variables/ https://foxipa.com/en/javascript/exercise/quiz/variables/ Practice let and const, initialization and reassignment, lexical scope, and template-literal substitutions. https://foxipa.com/en/javascript/exercise/quiz/numbers/ https://foxipa.com/en/javascript/exercise/quiz/numbers/ Check your understanding of Number, arithmetic, floating-point values, special values, and BigInt. https://foxipa.com/en/javascript/exercise/quiz/expressions-and-operators/ https://foxipa.com/en/javascript/exercise/quiz/expressions-and-operators/ Check your understanding of expressions, operators, short-circuiting, nullish coalescing, conditional expressions, and precedence. https://foxipa.com/en/javascript/exercise/quiz/strings/ Thu, 17 Sep 2026 00:00:00 +0000 https://foxipa.com/en/javascript/exercise/quiz/strings/ A short assessment covering quoting, slicing, immutability, and the methods worth memorizing. https://foxipa.com/en/javascript/exercise/quiz/booleans-and-conditionals/ Thu, 17 Sep 2026 00:00:00 +0000 https://foxipa.com/en/javascript/exercise/quiz/booleans-and-conditionals/ A short assessment covering strict equality, the falsy seven, nullish coalescing, and short-circuit logic. https://foxipa.com/en/javascript/exercise/quiz/functions/ Thu, 17 Sep 2026 00:00:00 +0000 https://foxipa.com/en/javascript/exercise/quiz/functions/ A short assessment covering the three syntaxes, defaults and rest, implicit returns, and scope. https://foxipa.com/en/javascript/exercise/quiz/objects/ Thu, 17 Sep 2026 00:00:00 +0000 https://foxipa.com/en/javascript/exercise/quiz/objects/ A short assessment covering destructuring, spread copies, optional chaining, and methods. https://foxipa.com/en/javascript/exercise/quiz/loops/ Thu, 17 Sep 2026 00:00:00 +0000 https://foxipa.com/en/javascript/exercise/quiz/loops/ A short assessment covering for...of versus for...in, the exits, and when not to loop at all. https://foxipa.com/en/javascript/exercise/quiz/values-types-coercion-equality/ https://foxipa.com/en/javascript/exercise/quiz/values-types-coercion-equality/ Practice JavaScript language types, truthiness, explicit conversion, equality, relational comparison, BigInt boundaries, and SameValue behavior. https://foxipa.com/en/javascript/exercise/quiz/control-flow-and-declarations/ https://foxipa.com/en/javascript/exercise/quiz/control-flow-and-declarations/ Check your understanding of blocks, declarations, branching, control transfer, exceptions, and automatic semicolon insertion. https://foxipa.com/en/javascript/exercise/quiz/scope-environments-closures/ https://foxipa.com/en/javascript/exercise/quiz/scope-environments-closures/ Check your understanding of lexical scope, shadowing, closures, and name resolution. https://foxipa.com/en/javascript/exercise/quiz/function-objects-and-this/ https://foxipa.com/en/javascript/exercise/quiz/function-objects-and-this/ Check your understanding of function objects, call-site this, arrow functions, call/apply/bind, and constructors. https://foxipa.com/en/javascript/exercise/quiz/objects-and-prototypes/ https://foxipa.com/en/javascript/exercise/quiz/objects-and-prototypes/ Check your understanding of own properties, prototype lookup, shared methods, constructors, classes, and descriptors. https://foxipa.com/en/javascript/exercise/quiz/arrays/ https://foxipa.com/en/javascript/exercise/quiz/arrays/ Check your understanding of array structure, mutation, copying, transformations, searching, sorting, modern copying methods, asynchronous collection, and grouping. https://foxipa.com/en/javascript/exercise/quiz/property-descriptors-accessors-integrity/ https://foxipa.com/en/javascript/exercise/quiz/property-descriptors-accessors-integrity/ Check your understanding of descriptors, accessors, and integrity levels. https://foxipa.com/en/javascript/exercise/quiz/map-set-weak-collections/ Sun, 27 Sep 2026 12:30:00 +0000 https://foxipa.com/en/javascript/exercise/quiz/map-set-weak-collections/ Check your understanding of keyed collection identity, membership, iteration, set algebra, and weak collection boundaries. https://foxipa.com/en/javascript/exercise/quiz/proxy-reflect-metaprogramming/ https://foxipa.com/en/javascript/exercise/quiz/proxy-reflect-metaprogramming/ Check your understanding of proxy traps, Reflect forwarding, invariants, and revocation. https://foxipa.com/en/javascript/exercise/quiz/iterators-and-generators/ https://foxipa.com/en/javascript/exercise/quiz/iterators-and-generators/ Check your understanding of iterable and iterator protocols, generators, delegation, closing, and lazy iterator helpers. https://foxipa.com/en/javascript/exercise/quiz/errors-defensive-control-flow/ https://foxipa.com/en/javascript/exercise/quiz/errors-defensive-control-flow/ Check your understanding of throwing, catching, cleanup, error categories, causes, and defensive boundaries. https://foxipa.com/en/javascript/exercise/quiz/promises/ https://foxipa.com/en/javascript/exercise/quiz/promises/ Check your understanding of Promise states, chaining, errors, cleanup, and combinators. https://foxipa.com/en/javascript/exercise/quiz/async-functions-and-iteration/ https://foxipa.com/en/javascript/exercise/quiz/async-functions-and-iteration/ Check your understanding of async functions, await, concurrency, async iterators, and async generators. https://foxipa.com/en/javascript/exercise/quiz/javascript-program-architecture/ https://foxipa.com/en/javascript/exercise/quiz/javascript-program-architecture/ Check your understanding of module boundaries, dependency direction, state ownership, adapters, lifecycle, and composition roots. https://foxipa.com/en/javascript/exercise/quiz/unicode-aware-strings/ https://foxipa.com/en/javascript/exercise/quiz/unicode-aware-strings/ Check your understanding of UTF-16 code units, code points, surrogate pairs, well-formed strings, normalization, and text boundaries. https://foxipa.com/en/javascript/exercise/quiz/global-object-standard-global-functions/ https://foxipa.com/en/javascript/exercise/quiz/global-object-standard-global-functions/ Check understanding of globalThis, global bindings, eval, numeric global functions, URI functions, and legacy globals. https://foxipa.com/en/javascript/exercise/quiz/regular-expressions/ https://foxipa.com/en/javascript/exercise/quiz/regular-expressions/ Check your understanding of ECMAScript regular-expression syntax, flags, captures, match indices, Unicode modes, and state. https://foxipa.com/en/javascript/exercise/quiz/json-and-structured-data/ https://foxipa.com/en/javascript/exercise/quiz/json-and-structured-data/ Check your understanding of JSON parsing, serialization, data limits, transformation hooks, and durable contracts. https://foxipa.com/en/javascript/exercise/quiz/symbols-and-property-protocols/ https://foxipa.com/en/javascript/exercise/quiz/symbols-and-property-protocols/ Check your understanding of Symbol identity, property keys, reflection, the global registry, and standardized protocol hooks. https://foxipa.com/en/javascript/exercise/quiz/dates-and-modern-time-temporal/ https://foxipa.com/en/javascript/exercise/quiz/dates-and-modern-time-temporal/ Check your understanding of Date time values, UTC/local interpretation, parsing, mutation, and Temporal types. https://foxipa.com/en/javascript/exercise/quiz/internationalization-intl/ https://foxipa.com/en/javascript/exercise/quiz/internationalization-intl/ Check your understanding of ECMA-402 Intl services and locale-sensitive presentation. https://foxipa.com/en/javascript/exercise/quiz/arraybuffer-typedarrays-dataview/ https://foxipa.com/en/javascript/exercise/quiz/arraybuffer-typedarrays-dataview/ Check your understanding of ArrayBuffer, TypedArrays, DataView, byte order, and binary data semantics. https://foxipa.com/en/javascript/exercise/quiz/sharedarraybuffer-atomics/ Sun, 27 Sep 2026 16:00:00 +0000 https://foxipa.com/en/javascript/exercise/quiz/sharedarraybuffer-atomics/ Check your understanding of SharedArrayBuffer, Atomics, atomic operations, and shared-memory coordination. https://foxipa.com/en/javascript/exercise/quiz/source-text-lexical-grammar-parsing/ https://foxipa.com/en/javascript/exercise/quiz/source-text-lexical-grammar-parsing/ Check your understanding of ECMAScript source text, lexical input, parsing goals, directive prologues, and automatic semicolon insertion. https://foxipa.com/en/javascript/exercise/quiz/classes/ https://foxipa.com/en/javascript/exercise/quiz/classes/ Check your understanding of class values, constructors, fields, private elements, inheritance, super, and static initialization. https://foxipa.com/en/javascript/exercise/quiz/execution-model-contexts-realms-jobs-agents/ https://foxipa.com/en/javascript/exercise/quiz/execution-model-contexts-realms-jobs-agents/ Check your understanding of ECMAScript execution contexts, Realms, Jobs, agents, and host boundaries. https://foxipa.com/en/javascript/exercise/quiz/explicit-resource-management/ https://foxipa.com/en/javascript/exercise/quiz/explicit-resource-management/ Check your understanding of using, await using, disposal protocols, disposable stacks, and deterministic resource lifetimes. https://foxipa.com/en/javascript/exercise/quiz/modern-ecmascript-update-pass/ https://foxipa.com/en/javascript/exercise/quiz/modern-ecmascript-update-pass/ Check your understanding of recent standardized ECMAScript additions and their ownership in the curriculum. https://foxipa.com/en/javascript/exercise/quiz/weak-references-finalization-registry/ https://foxipa.com/en/javascript/exercise/quiz/weak-references-finalization-registry/ Check your understanding of weak liveness, WeakRef, FinalizationRegistry, unregister tokens, and nondeterministic cleanup.