Tag: JavaScript

1. BigInt in JavaScript: Handling Arbitrarily Large Integers Safely

   Mar 5, 2026

   JavaScript Numbers are 64-bit floats, and they silently lose precision for integers above 9 quadrillion (2^53). BigInt solves the problem: arbitrarily large integers without rounding errors, for IDs, cryptography, timestamps and financial calculations.

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2. Profiling Memory with Heap Snapshots: Finding Retainers and Detached Nodes

   Mar 5, 2026

   A single heap snapshot shows only one moment in time, but the three snapshot technique systematically exposes which objects stay in memory despite the garbage collector. Retainer paths show exactly which reference prevents release, turning a vague memory suspicion into a concrete cause in the code.

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3. Web Locks API for Tab Coordination: Avoiding Race Conditions

   Mar 5, 2026

   When a user opens the same web application in several tabs, many background tasks run in parallel without anyone noticing: token refresh, cache building, syncing with the server. The Web Locks API provides an exclusive lock across tabs of the same origin through navigator.locks, letting you coordinate such tasks and reliably prevent duplicate execution.

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4. JavaScript Cache API: Caching HTTP Resources in the Browser

   Mar 5, 2026

   For a long time the browser cache was a black box. The Cache API gives developers full control over which requests get cached, how long they stay valid, and when they get replaced, independent of HTTP headers and browser heuristics.

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5. requestIdleCallback: Background Tasks Without Blocking the UI

   Mar 4, 2026

   The browser's main thread is a shared resource: animations, event handlers and rendering all compete with your business logic. requestIdleCallback resolves this conflict by shifting non-critical tasks into the browser's idle phases, without the user ever noticing.

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6. JavaScript Signals: The Reactive Paradigm for the Browser

   Mar 3, 2026

   Reactive programming is solved differently in every modern frontend framework, with incompatible APIs and abstractions hidden behind framework boundaries. The TC39 Signals proposal defines a universal foundation for the first time: Signal, computed, and effect as native JavaScript primitives that frameworks can build on.

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7. JavaScript Temporal API: Date and Time Finally Done Right

   Feb 5, 2026

   The Date object is one of the oldest and most error-prone parts of JavaScript. The Temporal API breaks with all of its design flaws: immutable types, explicit time zone semantics, correct calendar arithmetic and a clear API, without external libraries like Moment.js or date-fns.

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8. Mutation Testing for JavaScript with Stryker Mutator

   Jan 31, 2026

   One hundred percent code coverage only means every line was executed once, not that a test would actually notice a real bug. Mutation testing flips that question around: Stryker deliberately turns individual lines of code into small bugs and checks whether your tests actually catch these mutants and fail, instead of silently staying green.

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9. JavaScript Security: Detecting and Preventing XSS and Prototype Pollution

   Jan 29, 2026

   Cross-Site Scripting and Prototype Pollution are among the most common and dangerous JavaScript security vulnerabilities. XSS often arises from a single unsafe innerHTML assignment. Prototype Pollution corrupts Object.prototype and makes every instance across the entire program attackable. This article explains both attack vectors and shows concrete countermeasures.

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10. Implementing the Observer Pattern in JavaScript: Loosely Coupled Event Systems

    Jan 21, 2026

    The Observer Pattern decouples a state holder from the pieces of code that need to react to its changes, with no direct references between them at all. From a minimal subject class through the native EventTarget interface to WeakRef-based cleanup, this article shows how to implement the Observer Pattern robustly in plain JavaScript.

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