index.md

title
ES6 Feature Proposals

ES6 Feature Proposals

These ES6 feature proposals are not yet final. Read about the Harmony process to learn more about proposal status.

ES6 reached "proposal freeze" in May, 2011: no new major proposals can be added, although proposals can still be removed. TC39 is targeting a release date of December, 2013 for the official ES6 standard, but JS engines are implementing individual features before the spec is finalized.

Scoping

• block scoping
• destructuring
• default parameter values
• rest parameters
• spread

Modularity

• modules
• standard modules
• multiple globals
• object literals
• classes
• symbols

Control

• proper tail calls
• iterators
• for-of loop
• generators
• array comprehensions
• generator expressions
• arrow functions

Collections

• weak map
• maps and sets

Virtualization

• proxies
• loaders

Data

• binary data
• template strings

API improvements

• Array improvements
• Object.is
• Number improvements
• regexp improvements
• String improvements
• Math improvements
• Function improvements

Breaking changes

• completion reform