Way Back When
ES6 is derived historically after regular updates and modification process of ECMAScript standards, right from the development of its First edition. ES6 is also known as ES 2015, after its release in June 2015.
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Bonus Point: – There have been many reported conflicts in ideas with in the ECMA TC39 Committee, resulting in formation of ES 3.1 (ECMAScript 5). ES6 is a collaborative work of the full team, and therefore also known as ES Harmony.
ECMAScript 6 Overview – The road Map
The 6th Edition of EC, laid the foundation for library updates, regular and incremental language. ES6 is been widely welcomed across the industry and, is seen as the standard that is going to stay long. Reportedly Ember.js 2.0 is embracing full ES6 modules and AtScript is called to be new collaboration of ES6 and Angular 2.
Understand ECMAScript 6:
With a newer update to the previous version, ES6 has bought new syntax for writing complex and large application, but operates them syntactic to the ECMAScript 5 mode. Therefore, ES6 code can be trans-compiled into ES5 which adds more consistency to the multiple browsers. The added features have Python type generators, including iterator & of/for loop.
ES6 is coming quite well with support to many browsers such as Chrome 98%, Firefox 98%, Safari 99%, Opera 98% an Edge at 96%.
Major Differences So far:
• ES6 aims to perform over large applications, library creation, asynchronous programming with its major updates in class declarations, modules, generators & iterators.
• ECMAScript library built-ins has been expanded to perform more data abstractions having maps, sets, arrays and binary numeric values.
• Built-in expansion has also bought support for UNICODE supplemental character in the string & regular expressions.
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Inheritance and Classes
ES6 has now added some Object Oriented (OO) keywords such as class, extends, super, get and constructor. But, the lack of private methods result in the old methods being used for regular closures.
It is adding features for binding by utilizing pattern matching, with support for respective arrays and objects
The generator in ES6 are enabling the usage of function* and yield together in order to allow custom implementations.
Arrows are using “=>” Syntax. They have a similar function as used in Java8, CoffeeScript & C#.
Template String is syntactically the same to string features of languages like Perl or Python. These provide ease in construction of strings.
Proxies are allowing creation of objects with behaviours available to host the objects. They can be utilized for interception, logging or profiling.
The modules in ES6 add value import/export without polluting global namespace. Wildcard and Default is used for marking a value exported default.
Enhancement has been made to support efficient parsing of arbitrary long input string by keeping matching positions sticky between matches.
Binary &Octal Literal
The updated version supports directly safe binary and octal literals.
Extension has been made to parameter handling with easy definition of default parameters for function parameters.
The extended version has more expressive syntax and definition body.
New Built-in Methods
There are several new built-ins in ES6, which could be very useful for developers. Some in-built functions are listed below:
• Finding Array Element
• Repeating String
• String Searching
• Checking Number type
• Truncation of Number
The enhancement has a leak-free-memory object-oriented simultaneous data-structures. There are clean set data-structure and map data structure for common algorithms based on maps.