$ show sudheerj/ECMAScript-features
This repository is an educational cheatsheet/documentation project that provides code examples for ECMAScript features from ES2015 through ES2025. It is not a production application but rather a reference collection of JavaScript feature demonstrations organized by ECMAScript version. The code examples are designed to be run with Babel Node and serve as learning materials for developers exploring new JavaScript features. The architecture is a flat file structure with examples organized in versioned directories (es2015/, es2016/, etc.). Each .js file contains self-contained examples demonstrating specific language features like arrow functions, classes, promises, async/await, and newer features like Temporal API and Iterator Helpers. The repository uses Babel for transpilation support and includes a GitHub Actions workflow for generating documentation artifacts. This is primarily a documentation/educational resource rather than a reusable code library. The examples are intentionally simple and lack production-grade patterns like error handling, testing, or abstraction layers. They serve their purpose as learning materials but should not be directly imported into production codebases.
The LLM identified 5 files worth highlighting for reuse:
Comprehensive example demonstrating object and array destructuring patterns including nested destructuring, default values, rest operators, and function parameter destructuring. Well-structured with clear comments and practical use cases. Could serve as a reference for understanding modern JavaScript data extraction patterns.
Demonstrates Proxy object usage for intercepting fundamental operations like property lookup and assignment. Includes validation patterns showing how to enforce value constraints. Shows practical use case for creating validated objects with custom behavior.
Modern example of ES2025 Iterator Helpers demonstrating map, filter, take, drop, flatMap, reduce, and other utility methods. Shows functional chaining patterns for processing iterators efficiently. Well-documented with practical examples including data stream processing.
Comprehensive demonstration of the Temporal API for date/time manipulation. Covers all major Temporal objects (PlainDate, ZonedDateTime, Duration, etc.) with practical examples including age calculation, business days, and flight duration across timezones. Addresses Date object limitations.
Demonstrates ES2025 decorator metadata feature with practical API documentation generation example. Shows how to attach and retrieve metadata from decorated methods. Includes validation patterns and complete service class example with CRUD operations.