Prototypes & Inheritance Without the Headache
How the prototype chain resolves properties, what __proto__ and prototype mean, what new and class do under the hood, and how to wire inheritance by hand.
~7 min readread →
Developer interview notes & guides — Page 35
Focused explanations and longer guides, with worked scenarios, common mistakes and interview exercises across every chapter.
level:
Showing 817–825 of 825 articles
switchMap vs mergeMap vs concatMap vs exhaustMap
The four RxJS flattening operators differ in one thing: what happens when a new value arrives while the previous inner observable is still running.
~6 min readread →
Implement Debounce and Throttle From Scratch
Build debounce and throttle the way interviewers expect: timelines, this and args, cancel(), leading and trailing edges, and how to test them.
~7 min readread →
Build TypeScript's Utility Types From Scratch
Rebuild Partial, Pick, Omit, Exclude, ReturnType, Awaited and friends with mapped and conditional types, plus modifiers, key remapping and template literals.
~6 min readread →
memo, useMemo and useCallback: When They Actually Help
Why components re-render, what memo really compares, how referential equality decides it all, when memoization is wasted, and where React Compiler fits.
~6 min readread →
Angular Dependency Injection: Providers, Scopes & inject()
How Angular finds a dependency: element and environment injectors, providedIn root, provider recipes, InjectionToken, resolution modifiers and singletons.
~7 min readread →
The Node.js Event Loop Phases, Explained
What libuv does on each turn of the loop, where nextTick, promises, setImmediate and timers really run, and how to keep CPU-heavy work from blocking it.
~7 min readread →
The Cascade, Specificity & the Box Model
How the browser decides which CSS rule wins (origin, @layer, specificity, order), how inheritance and box-sizing work, and why z-index can seem broken.
~7 min readread →
Write Promise.all (and Friends) From Scratch
Implement Promise.all with native semantics, then allSettled, race, any and a concurrency-limited pool, plus the edge cases interviewers probe.
~6 min readread →
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