JavaScript Intl API — Dates, Numbers, Currency & Locale-Aware Formatting Without Hand-Rolling
Why not to hand-roll i18n formatting: Intl.NumberFormat, DateTimeFormat, PluralRules, Collator, Segmenter, performance, and timezone pitfalls.
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#js_10
10 entries
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JavaScript Error Handling & Resilience — try/catch Limits, Global Handlers, and Production Patterns
Senior deep-dive: Error object anatomy, what try/catch cannot catch, custom errors with cause, async patterns, global handlers, retries, and monitoring.
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Immutable State in JavaScript — References, Cloning, structuredClone, and Change Detection
Master JS value vs reference semantics, shallow copy traps, structuredClone limits, immutable updates, Object.freeze, and Map/Set for predictable state.
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Event Delegation & DOM Performance — Propagation, Batching, and Layout Thrashing
Senior guide to event delegation with closest(), addEventListener options, DocumentFragment batching, read/write separation, and when virtualization wins.
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Forms & the Constraint Validation API — Native Validation Done Right
Native HTML form validation deep-dive: ValidityState, setCustomValidity, async/cross-field patterns, ARIA errors, FormData — and why the server always wins.
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Robust Data Fetching — fetch(), AbortController, Retry, and the Stale-Response Race
Client-side fetch resilience for seniors: HTTP gotchas, AbortController timeouts, exponential backoff, stale-response races, dedup, and a fetchJSON wrapper.
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JavaScript Closures, Scope & this — Lexical Environments, Loop Bugs, and Binding Rules
Lexical scope, closures, the var-in-loop bug, memory tradeoffs, and this binding — with an interactive demo and real frontend patterns.
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Debounce, Throttle & rAF — rate-limiting high-frequency browser events
Debounce vs throttle vs rAF — from-scratch implementations, leading/trailing/maxWait, passive listeners, scrollend, and React pitfalls.
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JavaScript Async Patterns — Promises, Combinators, AbortController & Concurrency
Promise anatomy, sequential vs parallel pitfalls, all/allSettled/race/any semantics, cancellation, retries, concurrency pools, and error traps.
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JavaScript Event Loop Deep Dive — Microtasks, Macrotasks, and Real Browser Timing
Deep dive into the JS event loop: call stack, macrotask vs microtask queues, await desugaring, timer clamping, rAF, and predictable console ordering.