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Practical development notes, interactive tutorials, and browser-first tools by Inamullah Khan.

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JavaScript

Runtime behavior, async flow, errors, and browser fundamentals.

4 Articles
JavaScript

JavaScript Promises Explained with Interactive Execution Flow

A practical mental model for promise states, microtasks, then/catch/finally, and async/await.

Promises are not magic timers. They are state containers whose callbacks run through the microtask queue. This article turns that sentence into something you can see.

9 minPromises / Microtasks / Async/Await
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JavaScript

The JavaScript Event Loop Without the Hand-Wavy Explanation

Call stack, task queue, microtask queue, rendering timing, setTimeout, promises, and async/await with real execution order.

The event loop is easier when you stop memorizing diagrams and follow one rule: finish the current stack, flush microtasks, then move to the next task.

10 minEvent Loop / Tasks / Rendering
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JavaScript

Practical Error Handling in Modern JavaScript Apps

How to separate validation, fetch failures, server errors, logging, and user-facing messages.

Good error handling is not one giant try/catch. It is a boundary system: validate early, map API errors, show safe messages, and log useful developer context.

11 minErrors / Fetch / Validation
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JavaScript

AbortController, Fetch Timeouts, and Cancelled Requests in Real Products

How to stop stale requests, prevent race conditions, and make loading states honest.

A request that finishes late can still damage the UI. AbortController gives frontend code a way to cancel work that no longer belongs to the current screen, search query, or user action.

10 minFetch / AbortController / Race Conditions
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