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Use when working with modern JavaScript features like optional chaining, nullish coalescing, or ESM. (triggers: **\u002F*.js, **\u002F*.mjs, **\u002F*.cjs, const, let, arrow, async, await, promise, destructuring, spread, class)'\n---\n\n# JavaScript Language Patterns\n\n## **Priority: P0 (CRITICAL)**\n\n## Implementation Guidelines\n\n- **Variables**: const default. let if needed. No var — block scope only.\n- **Functionality**: Use **`Arrow Functions`** for callbacks\u002Finlines; **`Function Declaration`** for core logic.\n- **Async Logic**: Use async\u002Fawait with try\u002Fcatch and Promise.all() for parallel operations. ESM import\u002Fexport only. No Callbacks — promisify everything.\n- **Modern Syntax**: Use Destructuring, Spread (...), Optional Chain ?. and Nullish ?? coalescing.\n- **String Handling**: Use **`Template Literals`** (backticks) for interpolation and multi-line strings.\n- **Data Collections**: Prefer **`map`**, **`filter`**, and **`reduce`** over imperative `for` loops.\n- **Modules**: Standardize on ESM import\u002Fexport; use Named Exports over Default.\n- **Encapsulation**: Leverage **`#private`** class fields for encapsulation.\n- **Error States**: Throw **`new Error()`** with descriptive messages; never throw strings.\n\n## Anti-Patterns\n\n- No var — Block scope only.\n- **No `==`**: Strict `===`.\n- **No `new Object()`**: Use literals `{}`.\n- No Callbacks: Promisify everything.\n- **No Mutation**: Immutability first.\n\n## Code\n\n```javascript\n\u002F\u002F Modern Syntax\nconst [x, ...rest] = items;\nconst name = user?.profile?.name ?? 'Guest';\n\n\u002F\u002F Async + Error Handling\nasync function getUser(id) {\n  const res = await fetch(`\u002Fapi\u002F${id}`);\n  return res.json(); \u002F\u002F Errors propagate\n}\n\n\u002F\u002F Private Fields\nclass Service {\n  #key;\n  constructor(k) {\n    this.#key = k;\n  }\n}\n```\n\n## Reference & Examples\n\nFor advanced patterns and functional programming:\nSee [references\u002FREFERENCE.md](references\u002FREFERENCE.md).\n\n## Related Topics\n\nbest-practices | tooling\n\n","# JavaScript Language Patterns\n\n## **Priority: P0 (CRITICAL)**\n\n## Implementation Guidelines\n\n- **Variables**: const default. let if needed. No var — block scope only.\n- **Functionality**: Use **`Arrow Functions`** for callbacks\u002Finlines; **`Function Declaration`** for core logic.\n- **Async Logic**: Use async\u002Fawait with try\u002Fcatch and Promise.all() for parallel operations. ESM import\u002Fexport only. No Callbacks — promisify everything.\n- **Modern Syntax**: Use Destructuring, Spread (...), Optional Chain ?. and Nullish ?? coalescing.\n- **String Handling**: Use **`Template Literals`** (backticks) for interpolation and multi-line strings.\n- **Data Collections**: Prefer **`map`**, **`filter`**, and **`reduce`** over imperative `for` loops.\n- **Modules**: Standardize on ESM import\u002Fexport; use Named Exports over Default.\n- **Encapsulation**: Leverage **`#private`** class fields for encapsulation.\n- **Error States**: Throw **`new Error()`** with descriptive messages; never throw strings.\n\n## Anti-Patterns\n\n- No var — Block scope only.\n- **No `==`**: Strict `===`.\n- **No `new Object()`**: Use literals `{}`.\n- No Callbacks: Promisify everything.\n- **No Mutation**: Immutability first.\n\n## Code\n\n```javascript\n\u002F\u002F Modern Syntax\nconst [x, ...rest] = items;\nconst name = user?.profile?.name ?? 'Guest';\n\n\u002F\u002F Async + Error Handling\nasync function getUser(id) {\n  const res = await fetch(`\u002Fapi\u002F${id}`);\n  return res.json(); \u002F\u002F Errors propagate\n}\n\n\u002F\u002F Private Fields\nclass Service {\n  #key;\n  constructor(k) {\n    this.#key = k;\n  }\n}\n```\n\n## Reference & Examples\n\nFor advanced patterns and functional programming:\nSee [references\u002FREFERENCE.md](references\u002FREFERENCE.md).\n\n## Related Topics\n\nbest-practices | tooling\n\n",{"name":5,"description":7},"main","def8531e65114c0fca8fb8551c1871ee0eed705c","skills\u002FHoangNguyen0403\u002Fagent-skills-standard\u002Fjavascript-language",24,"https:\u002F\u002Fgithub.com\u002FComeOnOliver\u002Fskillshub","https:\u002F\u002Fskillshub.wtf","https:\u002F\u002Fgithub.com\u002FComeOnOliver","AI & Blockchain Engineer\r\n","2026-06-24 22:07:19",{"source":8,"skillName":5,"commands":53,"prompt":63,"zipAvailable":64},[54,57,60],{"tool":55,"command":56},"npx","npx skills add 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