rse/es6-features
Es6 Features
This project is a reference catalogue of the new syntax and behavioral changes introduced in the ECMAScript 6 (ES6) specification for JavaScript. It serves as a curated overview and comparison table of the language features defined by the standard, documenting additions such as block scoping with let and const, arrow function syntax, default parameter handling, and rest parameter collection.
The reference is structured as a side-by-side comparison chart that maps old and new JavaScript syntax patterns, providing a focused guide for each capability. It covers the core language fundamentals introduced in ES6, including lexical this binding in callbacks, immutable variable declarations, block-scoped functions and variables, and concise anonymous function syntax.
The documentation is organized around a specification-driven feature mapping, breaking down each ES6 capability into its smallest testable unit. It includes a cross-engine compatibility matrix that documents which JavaScript engines support each feature, serving as a canonical source for tooling, education, and static code analysis baselines.
Features
- ECMAScript Syntax Extensions - Provides an overview and comparison table of new JavaScript language features in the ES6 specification.
- JavaScript Language References - Catalogs syntax additions and behavioral changes defined by the ES6 standard.
- Anonymous Functions - Uses arrow syntax with expression or statement bodies for shorter, more readable closures.
- Variadic Argument Collections - Aggregates trailing function arguments into a single array parameter for flexible handling.
- Explicit This Binding Techniques - Captures the surrounding this value automatically inside arrow functions, removing manual binding.
- Default Parameter Assignments - Assigns default values to function parameters when the argument is undefined.
- Immutable Variables - Declares variables that cannot be reassigned, keeping the variable itself immutable.
- Block-Scoped Variable Declarations - Binds variables and constants to block scope without hoisting, preventing leakage outside the block.
- Block-Scoped Function Declarations - Defines functions inside a block so they are only accessible within that block's scope.
- Arrow Function Expressions - Documents arrow function syntax, lexical this binding, and concise expression bodies in ES6.
- Language Syntax Registries - Maintains a curated catalogue of ES6 syntax forms as a canonical source for tooling and education.
- Side-by-Side Comparisons - Provides side-by-side comparisons of old and new JavaScript syntax patterns for ES6 features.
- Cross-Engine Compatibility Layers - Documents which JavaScript engines support each ES6 feature for cross-engine targeting.
- Specification-Section Mappings - Organises ES6 features by their specification section for side-by-side comparison.
- Static Analysis Baselines - Provides reference implementations for each ES6 feature to verify correct transpilation or runtime support.
- Testable Unit Decompositions - Breaks down each ES6 capability into its smallest testable unit for precise validation.
- Language and Compilation - Comparison and overview of ES6 features.
- Language and Tooling - Compares and overviews ES6 features.
Star history
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