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Languages & runtimes · #javascript
Prefixing Grunt tasks with newer: makes builds incremental by skipping unchanged files. Learn how the timestamp cache works, where it breaks, and how to verify the speedup.
D3's data join pattern reconciles changing datasets with the DOM without rebuilding everything. Learn when to use explicit enter/update/exit versus the concise .join() shorthand, and how key functions prevent broken element mapping.
Stop shipping unnecessary polyfills. Learn how to use @babel/preset-env's useBuiltIns option to automatically inject only the code your target browsers actually need.
Follow this step‑by‑step diagnostic guide to spot, isolate, and eliminate long synchronous JavaScript tasks that cause UI jank, input lag, and frame drops in web apps.
Flat config replaces .eslintrc with an array of JavaScript objects. Learn the merge semantics, plugin registration, and migration pitfalls that cause silent lint failures.
Stop fighting the node_modules folder. Learn how Yarn Plug'n'Play (PnP) eliminates recursive file searches to speed up installations and enforce strict dependency management.
Learn how ESLint v8’s flat configuration replaces .eslintrc files with a single JavaScript file, enabling overrides, TypeScript support, and easier sharing.
Stop using .reduce() to build objects from maps. Learn how to implement the ES2020 Object.fromEntries polyfill via CoreJS to ensure cross-browser compatibility without bloating your bundle.
See how CoffeeScript’s class syntax compiles to JavaScript’s prototypal inheritance, what the generated code looks like, and how to debug it effectively.
grunt
d3js
eslint
yarn
corejs
coffeescript