Mastery

JavaScript · Expert - architecture, internals and edge cases

• The event loop: call stack, microtasks, macrotasksUnderstand how the engine actually schedules synchronous code, microtasks, and macrotasks.
• Iterators, generators, and iteration protocolsMaster the protocols behind for...of, spread, and destructuring, then use generators to produce lazy sequences.
• Proxy, Reflect, and metaprogrammingIntercept the language's fundamental operations with Proxy traps and cleanly delegate default behavior with Reflect.
• Memory and performance: GC, WeakMap/WeakRef, debounce/throttleUnderstand how the garbage collector works, use weak references to avoid leaks, and smooth out expensive work with debounce and throttle.
• Functional patterns: currying, composition, immutabilityStructure your code with currying, function composition, and immutable data to gain predictability and testability.