Tag: javascript
Scheduler API (scheduler.postTask) ES2021
The Scheduler API (scheduler.postTask) lets you prioritise async tasks — user-blocking, user-visible, or background — giving the browser hints to schedule work optimally.
2mo ago
javascript advanced
Streams API — ReadableStream & WritableStream HTML5
The Streams API provides composable, backpressure-aware data pipelines in the browser — processing large responses, files, or media chunk by chunk without buffering everything in memory.
2mo ago
javascript advanced
Memory Leaks — Closures, Detached DOM ES2015
JavaScript memory leaks occur when references are accidentally retained — common causes: closures holding large objects, detached DOM nodes, forgotten event listeners, and growing Maps/Sets.
2mo ago
javascript advanced
IndexedDB ES2015
Browser-native NoSQL database for offline-capable PHP web apps — stores structured data that survives page reloads, complements service workers.
2mo ago
javascript advanced
Symbol & the Iterator Protocol ES2015
Symbol.iterator makes objects iterable with for...of — implementing the iterator protocol enables custom data structures to participate in all iteration contexts.
2mo ago
javascript advanced
Typed Arrays & ArrayBuffer ES2015
Fixed-type binary arrays (Int32Array, Float64Array, Uint8Array) backed by raw ArrayBuffer memory — essential for WebGL, audio processing, file handling, and Web Workers.
2mo ago
javascript advanced
WeakRef & FinalizationRegistry ES2021
WeakRef holds a weak reference allowing GC to collect the object — used for memory-safe caches. FinalizationRegistry runs a callback when an object is collected.
2mo ago
javascript advanced
Web Components ES2018
Browser-native custom elements, shadow DOM, and HTML templates — framework-agnostic reusable components that work in React, Vue, plain HTML, and anywhere.
2mo ago
javascript advanced
Web Crypto API ES2015
Browser-native cryptographic operations — crypto.subtle provides AES-GCM encryption, ECDSA signing, PBKDF2 key derivation, and SHA digests without external libraries.
2mo ago
javascript advanced
JavaScript Generators ES2015 Functions that can pause execution and yield values on demand — enabling lazy sequences, infinite iterables, and cooperative async control flow.
2mo ago
javascript advanced
Prototype Pollution ES5
An attacker injects properties into JavaScript's Object.prototype, affecting all objects in the application.
CWE-1321 OWASP A3:2021
2mo ago
security advanced
8.1
Proxy & Reflect API ES2015
Proxy wraps an object and intercepts fundamental operations (get, set, delete) via handler traps — Reflect provides the default implementations of those operations.
2mo ago
javascript advanced
Web Components ES2018
A suite of native browser APIs (Custom Elements, Shadow DOM, HTML Templates) for creating reusable, encapsulated HTML elements without frameworks.
2mo ago
frontend advanced
Web Workers ES2015
Background threads in the browser that run JavaScript without blocking the main thread — essential for CPU-intensive tasks that would otherwise freeze the UI.
2mo ago
javascript advanced