list of programming languages
The this keyword is one of the most confusing parts of JavaScript — until you understand one simple rule: this is determined by how a function is called, not where it’s defined. Once you internalize that rule, everything else falls into place. Key point: this refers to the execution context of a function — the…
These two media features are essential for accessibility and personalization. They let you respect the user’s preferred color scheme (light/dark) and contrast level. Overview of Features Feature Description Values prefers-color-scheme User’s preferred color scheme light, dark prefers-contrast User’s preferred contrast level no-preference, more, less, custom 1. prefers-color-scheme The prefers-color-scheme media feature detects whether the user…
The spread operator (…) takes an iterable — an array, a string, a Set, a Map — or an object, and expands its contents into individual elements. It’s the opposite of the rest parameter, which collects values into an array. Same syntax, different purpose. Key point: Spread expands; rest collects. Both use …, and the…
These two media features prioritize user comfort and performance. One respects users who want less data usage, the other respects users who are sensitive to motion. Overview of Features Feature Description Values prefers-reduced-data User wants lighter data usage no-preference, reduce prefers-reduced-motion User wants less animation/motion no-preference, reduce 1. prefers-reduced-data The prefers-reduced-data media feature detects if…
A Promise is JavaScript’s way of representing a value that isn’t available yet but will be — or won’t be — at some point in the future. It’s the foundation of modern asynchronous code, and it solves the “callback hell” problem that plagued JavaScript before ES6. Key point: A Promise is an object with three…
These two media features address accessibility (transparency preferences) and legacy display technology (interlaced vs progressive scanning). Overview of Features Feature Description Values prefers-reduced-transparency User wants less transparency no-preference, reduce scan Monitor’s scanning process interlaced, progressive 1. prefers-reduced-transparency The prefers-reduced-transparency media feature detects if the user has requested reduced transparency — important for users who have…
async and await are the syntax sugar on top of Promises that makes asynchronous code read like synchronous code. Instead of chaining .then() calls, you write await in front of a Promise — and the function pauses until the Promise settles, without blocking the rest of the program. Key point: async marks a function as…
These three media features let you adapt styles based on JavaScript availability, display refresh capability, and HDR video support. Overview of Features Feature Description Values scripting Detects JavaScript availability none, initial-only, enabled update How often the display can update none, slow, fast video-dynamic-range Dynamic range of the video plane standard, high 1. scripting The scripting…
ES Modules (ESM) are the official, standardized way to split JavaScript code into reusable files. They use import and export to share code between files, and they’ve replaced the older CommonJS (require/module.exports) approach in modern JavaScript. Key point: ES Modules are static — imports are resolved at load time, not runtime (except for dynamic import())….
45. Transform Property Introduction The transform property is one of the most powerful tools in CSS. It lets you rotate, scale, skew, and translate elements — all without affecting the layout of other elements. What is the transform Property? The transform property applies 2D or 3D transformations to an element. Unlike properties like margin or…
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