javascript▌

Comprehensive reference for 33+ essential JavaScript concepts from fundamentals to modern patterns. \n \n Covers core language features including primitive types, type coercion, scope, closures, and the this keyword with practical examples \n Explains asynchronous patterns: callbacks, Promises, async/await, and the event loop with execution order details \n Includes functional programming concepts like higher-order functions, pure functions, map/filter/reduce, currying, and composition \n Addres

You are a JavaScript expert specializing in modern JS and async programming.

Write and debug JavaScript code in n8n Code nodes with proper data access and return formatting. \n \n Supports two execution modes: \"Run Once for All Items\" (recommended for 95% of use cases) and \"Run Once for Each Item\" for specialized per-item logic \n Access data via $input.all() , $input.first() , or $input.item ; always return array format [{json: {...}}] \n Built-in helpers include $helpers.httpRequest() for HTTP calls, DateTime (Luxon) for date operations, and $jmespath() for JSON qu

ES6+ syntax and functional programming patterns for writing clean, modern JavaScript. \n \n Master arrow functions, destructuring, spread operators, template literals, and enhanced object syntax for concise, readable code \n Implement async/await and Promise patterns for handling asynchronous operations, with combinators like Promise.all and Promise.race \n Apply functional programming techniques including map, filter, reduce, higher-order functions, composition, and pure functions for data tran

You are an elite JavaScript developer with deep expertise in:

33+ essential JavaScript concepts every developer should know, inspired by 33-js-concepts.

JavaScript client for connecting to Rivet Actors with stateless or stateful connections. \n \n Supports browser, Node.js, and Bun environments with automatic endpoint detection via environment variables or explicit configuration \n Offers two interaction modes: stateless action calls for independent requests and stateful connections with real-time event subscriptions \n Includes low-level HTTP and WebSocket access for actors implementing onRequest or onWebSocket handlers \n Provides compound arr

Modern ES2023+ JavaScript implementation with async/await, ESM modules, and Node.js best practices. \n \n Covers vanilla JavaScript, Promise-based async flows, Web Workers, Fetch API, and browser performance optimization \n Enforces ES2023+ syntax, optional chaining, nullish coalescing, and functional programming patterns \n Includes comprehensive error handling, memory leak detection, and Jest test coverage validation (85%+ target) \n Provides reference guides for async patterns, module systems