Page 3 - JavaScript

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Cancellable Async Operations as a Pattern

Maxim Mironjuk - January 07, 2026

Cancellable async operations do not emerge from simply attaching an AbortController to a fetch call, they come from a deliberate architecture decision: every function that runs for a while accepts a cancellation signal from the start, guarantees cleanup, and passes the signal consistently through every layer.

JavaScript Design Patterns

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Closures in Loops: Understanding Stale Closures

Maxim Mironjuk - December 30, 2025

A loop registers five buttons, every click logs the same number instead of the expected sequence. This pattern is called a stale closure, and it hits not just classic var loops but also modern event handlers and asynchronous code. This article shows where stale closures come from, why let often fixes the problem, and how to systematically debug the remaining cases.

JavaScript Web Performance

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Atomics and SharedArrayBuffer in JavaScript: True Parallelism in the Browser

Maxim Mironjuk - December 23, 2025

JavaScript is single-threaded by nature, but with SharedArrayBuffer and Atomics there is true shared memory between threads. This solves scenarios that could not be handled efficiently with postMessage: fast image processing, parsers, WASM integration and lock-free data structures.

JavaScript TypeScript

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Top-Level Await in JavaScript: ES Modules Without an async Wrapper

Maxim Mironjuk - December 18, 2025

Top-level await was one of the most requested features for JavaScript modules: waiting for asynchronous initialization directly in module scope, without wrapping the entire module in an async function. Few developers understand its effect on the module graph and the potential for deadlocks, this guide explains both.

JavaScript Web Performance

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JavaScript Fetch API Mastery: Building Production-Grade HTTP Requests

Maxim Mironjuk - December 15, 2025

The Fetch API is more than a replacement for XMLHttpRequest. Anyone who masters timeouts, retry logic, streaming responses, authentication and cache strategies writes HTTP communication that stays reliable and maintainable in real applications, without external libraries.

JavaScript Security/OWASP

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JavaScript crypto.randomUUID(): Secure UUIDs in the Browser

Maxim Mironjuk - December 12, 2025

Math.random() is unsuitable for IDs, since it relies on a predictable pseudo-random generator. crypto.randomUUID() delivers genuine UUID v4 values from a cryptographically secure random generator, with no external dependencies, equally in the browser and in Node.js.

JavaScript Design Patterns

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Dependency Injection in Vanilla JavaScript: Loose Coupling Without a Framework

Maxim Mironjuk - December 08, 2025

Dependency injection reverses control over how dependencies are created, instead of letting every class instantiate its own collaborators. With no Angular or NestJS in sight, this article shows how constructor injection, a minimal DI container and clean lifecycle management enable loose coupling and easy testability in plain JavaScript.

JavaScript Design Patterns

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Avoiding Race Conditions in Async UI Code

Maxim Mironjuk - December 07, 2025

Race conditions in async UI code happen when a request started later but answering faster overtakes a request started earlier but answering more slowly. Sequence numbers, AbortController and clean state handling prevent users from seeing stale data that no longer matches the current input.

JavaScript

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Monorepo JS Tooling: Fundamentals for Workspaces and Task Runners

Maxim Mironjuk - December 03, 2025

Monorepo JS tooling solves a problem that becomes unavoidable as the number of packages in a project grows: shared dependencies, repeated build steps, and versioning across multiple packages. Workspaces in npm, pnpm and yarn lay the foundation, while Turborepo and Nx build on top of them as task runners and drastically cut build time through caching.

JavaScript Web Performance

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JavaScript Intersection Observer: Lazy Loading, Animations and Infinite Scroll

Maxim Mironjuk - November 27, 2025

Scroll event listeners for visibility checks are outdated and expensive. The Intersection Observer delivers viewport notifications without blocking the main thread, without layout thrashing, and with configurable thresholds, the modern solution for lazy loading, scroll animations and infinite scroll.