RxJS - Code-JS

Race Conditions in Angular: switchMap vs mergeMap vs concatMap vs exhaustMap [2026]

Lesson 10.6 of the Angular tutorial — fixing race conditions in async code: a decision table for switchMap, mergeMap, concatMap and exhaustMap with typeahead, save-button and upload-queue examples, stale-request cancellation in resource() and httpResource(), AbortController with fetch, and untracked() for effect cycles.

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Finding Subscription and Effect Leaks in Angular: A Codebase Audit [2026]

Leave a Comment / Angular / Code-JS

Lesson 10.5 of the Angular tutorial — a code-level leak audit: searches that find risky subscriptions, timers and listeners, retrofitting takeUntilDestroyed() and toSignal(), DestroyRef.onDestroy cleanup, onCleanup in effects, and lint rules that keep leaks out.

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Why Does My Angular HTTP Call Fire Twice? Causes and Fixes [2026]

1 Comment / Angular / Code-JS

Lesson 10.4 of the Angular tutorial — why HttpClient requests fire twice: cold Observables with multiple subscribers, effects that re-run, SSR without the HTTP transfer cache, retry loops and CORS preflights, plus a Network-panel routine to tell them apart.

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Angular Memory Leaks: Find and Fix Them With Heap Snapshots [2026]

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Lesson 8.7 of the Angular tutorial — a practical memory-leak playbook: symptoms, a heap-snapshot comparison workflow, retainer paths, leaks that survive takeUntilDestroyed (shareReplay, registries, caches, libraries, overlays) and memlab.

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Angular takeUntilDestroyed() and DestroyRef: Modern Cleanup [2026]

1 Comment / Angular / Code-JS

Lesson 7.4 of the Angular tutorial — DestroyRef and takeUntilDestroyed(): tie every subscription, listener and timer to the right lifetime, and the leaks that still get through.

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Angular RxJS & Signal Interop: toSignal, toObservable, and rxResource [2026]

1 Comment / Angular / Code-JS

Lesson 7.3 of the Angular tutorial — how toSignal(), toObservable(), and rxResource() really behave: subscription timing, cleanup, errors, coalescing, and the leaks to avoid.

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Angular RxJS in 2026: When Signals Aren’t Enough and Observables Win [2026]

1 Comment / Angular / Code-JS

Lesson 7.2 of the Angular tutorial — RxJS in 2026: when signals aren’t enough, the 10 operators worth knowing, switchMap/mergeMap/concatMap/exhaustMap decision tree, real-world multi-step upload pattern.

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Angular Signal vs Observable: The 2026 Decision Tree for Reactive Primitives [2026]

Leave a Comment / Angular / Code-JS

Lesson 3.7 of the Angular tutorial — the signal-vs-observable decision tree: comparison table, when each is the right primitive, resource() for async, toSignal/toObservable bridges, coexisting in one component, migration guidance.

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Optimizing User Input Handling in Angular: Implementing Debouncing with switchMap

1 Comment / RxJs, Angular / Code-JS

Link copied Optimizing User Input Handling in Angular: Implementing Debouncing with switchMap Angular Tutorial › Module 7: RxJS › Lesson 7.1 Achieving Debouncing in Angular Using switchMap # Debouncing is a technique used to limit the rate at which a function or event handler is triggered. In web applications, it’s often employed to handle user

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