What are the new features of EcmaScript6?

EcmaScript is a standard scripting language. JavaScript has the full implementation of EcmaScript. There are other scripting languages that also supports EcmaScripts standards. Following is the history timeline of EcmaScript:

1995: JavaScript is born as LiveScript
1997: ECMAScript standard is established
1999: ES3 comes out and IE5 is all the rage
2000–2005: XMLHttpRequest, a.k.a. AJAX, gains popularity in app such as Outlook Web Access (2000) and Oddpost (2002), Gmail (2004) and Google Maps (2005).
2009: ES5 comes out (this is what most of us use now) with forEach, Object.keys, Object.create (specially for Douglas Crockford), and standard JSON
2015: ES6/ECMAScript2015 comes out; it has mostly syntactic sugar, because people weren’t able to agree on anything more ground breaking (ES7?)

There are some really cool features that JavaScript developer should know:

• Default Parameters
• Template Literals
• Multi-line Strings
• Destructuring Assignment
• Enhanced Object Literals
• Arrow Functions
• Promises
• Block-Scoped Constructs Let and Const
• Classes
• Modules
• Default
• Spread
• Spread + Object Literals
• Rest
• Let
• Const
• For..of
• Unicode
• Set
• WeakSet
• Map
• WeakMap
• Proxies
• Symbols
• Inheritable Built-ins
• New Library
• Binary and Octal
• Reflect
• Tail Call Optimization