ECMA 5

ECMA 6

Norfolk.ecma?

ECMAScript is a Language Specification

(Deterministic Context-free Language for the linguistic nerds)

Javascript is a particular implementation of ECMAScript

An expanded ECMA specification make new Javascript features possible

Ratification in June 2015

But you can start using the features now

Some ES6 Features

• promises
• generators
• iterators + for..of
• let + const
• template strings
• arrows
• classes
• enhanced object literals
• destructuring
• default + rest + spread
• unicode
• modules
• module loaders
• map + set + weakmap + weakset
• proxies
• symbols
• subclassable built-ins
• math + number + string + object APIs
• binary and octal literals
• reflect api
• tail calls

Before

After

Promises

User.create({ username: 'tjwebb' })

    .then(function (user) {
        console.log('hey', user);
    })

    .catch(function (e) {
        console.error('uh oh', e);
    });

User.create({ username: 'tjwebb' })

    .then(function (user) {
        console.log('hey', user);
    })

    .catch(function (e) {
        console.error('uh oh', e);
    });