Javascript terms
From DOM manipulation to async superpowers
JavaScript has evolved from a scripting curiosity into a full-stack language powering browsers, servers, and everything in between. This category covers the language core — closures, prototypes, async patterns, the event loop, modern ES2024+ features — as well as runtime behaviour that trips up developers at every experience level. Understanding JavaScript deeply means fewer bugs and more confident code.
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Most referenced — JavaScript
JavaScript Bundling — Vite, Webpack, esbuild 2Destructuring & Spread (JS) 1CSRF Token Handling in Fetch & Axios 1Accidental Object Mutation Bugs 1ES Modules (import/export) 1Client-Side Sanitisation 1JavaScript Event Loop 1
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async / await in JavaScript ES2017
async functions always return a Promise; await pauses execution inside an async function until a Promise settles — giving asynchronous code the readability of synchronous code without blocking the event loop.
4w ago
javascript intermediate
ES Modules (ESM) ES2015
The official JavaScript module system — import and export statements enable static dependency graphs, tree-shaking, and native browser module loading without a bundler.
4w ago
javascript intermediate
Fetch API ES2015
The browser-native Promise-based API for making HTTP requests — replacing XMLHttpRequest with a cleaner interface supporting streaming, CORS, and request/response objects.
4w ago
javascript beginner
Memory Management in JavaScript
JavaScript uses automatic garbage collection — the engine reclaims memory when objects are no longer reachable. Memory leaks occur when references are unintentionally retained, preventing collection.
4w ago
javascript intermediate
Array.flat() & Array.flatMap() ES2019
Array.flat(depth) flattens nested arrays; Array.flatMap() maps then flattens one level — more efficient than map().flat() and great for expanding items.
2mo ago
javascript beginner
BigInt — Arbitrary Precision Integers ES2020
JavaScript's Number type cannot safely represent integers larger than 2⁵³−1 (Number.MAX_SAFE_INTEGER). BigInt is a separate numeric type that handles integers of arbitrary size, essential for working with 64-bit IDs from databases, cryptographic values, and precise financial calculations.
2mo ago
javascript intermediate
BroadcastChannel — Cross-Tab Messaging HTML5
BroadcastChannel allows same-origin pages/tabs to communicate — post a message on one tab, receive it in all others — without a server or service worker.
2mo ago
javascript intermediate
Canvas API — 2D Drawing HTML5
The HTML Canvas API provides a 2D drawing surface via JavaScript — used for charts, image manipulation, games, data visualisations, and any pixel-level rendering that DOM elements cannot efficiently handle.
2mo ago
javascript intermediate
Clipboard API HTML5
The async Clipboard API (navigator.clipboard) is the modern replacement for document.execCommand('copy') — supports text, images, and rich content with proper permission handling.
2mo ago
javascript beginner
Error.cause — Error Chaining ES2022
ES2022 added a cause option to the Error constructor — 'new Error('message', { cause: originalError })' — enabling proper error chaining where a high-level error wraps its underlying cause, preserving the full error context across abstraction layers.
2mo ago
javascript beginner
EventSource API — Server-Sent Events (Client Side) HTML5
EventSource is the browser API for consuming Server-Sent Events (SSE) — a one-directional server-to-client stream over HTTP that automatically reconnects, ideal for live feeds, notifications, and streaming LLM responses.
2mo ago
javascript intermediate
Geolocation API HTML5
navigator.geolocation provides GPS/network location data — requires HTTPS, user permission, and graceful fallback handling for denial or unavailability.
2mo ago
javascript beginner
Import Maps ES2020
Import maps let browsers resolve bare module specifiers (import 'lodash') without a bundler — mapping module names to URLs in a JSON script tag.
2mo ago
javascript intermediate
IntersectionObserver API HTML5
IntersectionObserver fires when an element enters or leaves the viewport — the modern way to implement lazy loading, infinite scroll, and scroll-triggered animations.
2mo ago
javascript intermediate
MutationObserver API HTML5
MutationObserver watches DOM tree changes — attribute changes, child additions/removals, text content changes — without polling or event listener on each node.
2mo ago
javascript intermediate
Object.freeze / Object.seal ES5
Object.freeze() prevents all property changes (add/modify/delete), Object.seal() prevents add/delete but allows modification — both are shallow, not deep.
2mo ago
javascript intermediate
Page Visibility API HTML5
The Page Visibility API tells you when a tab is hidden or visible — use it to pause animations, polls, and video when the user switches tabs.
2mo ago
javascript beginner
Permissions API HTML5
The Permissions API (navigator.permissions.query()) lets you check the current state of browser permissions — granted, denied, or prompt — before requesting sensitive APIs.
2mo ago
javascript intermediate
Promise.allSettled / Promise.any / Promise.race ES2020
Three Promise combinators for handling multiple async operations — allSettled() waits for all to complete regardless of failure, any() resolves with the first success, race() resolves or rejects with the first to settle.
2mo ago
javascript intermediate
requestAnimationFrame — Smooth Animations HTML5
requestAnimationFrame(callback) schedules a function to run before the browser's next repaint — the correct way to animate in JavaScript, producing smooth 60fps motion and automatically pausing when the tab is hidden.
2mo ago
javascript intermediate