modern-javascript

SKILL.md

Write clean, performant, maintainable JavaScript using modern language features. This skill covers ES6 through ES2025, emphasizing immutability, functional patterns, and expressive syntax.

| ES6 | 2015 | let/const, arrow functions, classes, destructuring, spread, Promises, modules, Symbol, Map/Set, Proxy, generators | | ES2016 | 2016 | Array.includes(), exponentiation operator | | ES2017 | 2017 | async/await, Object.values/entries, padStart/padEnd, trailing commas, SharedArrayBuffer, Atomics |

| ES2018 | 2018 | Rest/spread for objects, for await...of, Promise.finally(), RegExp named groups, lookbehind, dotAll flag | | ES2019 | 2019 | .flat(), .flatMap(), Object.fromEntries(), trimStart/End(), optional catch binding, stable Array.sort() |

Modern JavaScript (ES6-ES2025) patterns and best practices. Triggers on: JavaScript, ES6, ES2020, ES2022, ES2024, modern JS, refactor legacy, array methods, async/await, optional chaining, nullish coalescing, destructuring, spread, rest, template literals, arrow functions, toSorted, toReversed, at, groupBy, Promise, functional programming. Use when: writing new JavaScript code, refactoring legacy code, modernizing codebases, implementing functional patterns, or reviewing JS for performance and readability. Proactively apply when creating web applications, Node.js services, or any JavaScript project. Source: ccheney/robust-skills.

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