Traceur is documentation created and maintained by team Google.
ENext is mainly for accolade for Babel, and it is easy to use when getting started and the website has to perform some test code.
In the third edition consist of some bug that’s why the third version becomes a failure. The Fourth version of ECMA-262 is out in 1999. An es4 proposal backed in August 2008. The included features are in 4th versions such as classes, a module system, Generators and iterators and algebraic data types. This version also supports JSON encoding and decoding that is very useful for finding bugs.
It is shorthand ways which select some item from an array or object into another array or object.
ES6 consists of some template features. You are familiar with some tempting system like Mustache and handlebars and string exclamation feature of a language.
Arrow function is also known anonymous function which is part of ES6 version. When you declare Arrow function, this keyword value is defined.