Ecma script 2015
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ECMA (European Computer Manufacturers Association) aims to develop standards and technical reports to facilitate and standardize the use of information communication technology. ECMA Provides standard for, C# , C++/CLI , Dart, JavaScript etc. ECMAScript 6 is the newest version of the ECMAScript standard. This standard was ratified in June 2015. ES2015 is a significant update to the language, and the first major update to the language since ES5 was standardized in 2009. It has a lot new features like Scoping, Arrow Functions, Unicode String, Modules, Classes, New builtin methods & lot more. We will be focusing on how JavaScript is enhanced with the advent of ES2015.
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Ecma script 2015
- 1. Presented By Muhammad Faizan
- 2. Ecmascript Release Date Changes 1 June 1997 First edition 2 June 1998 Editorial changes for fully aligned specification 3 Dec 1999 Regular Expression, error, string handlers, formatting of input and output enhanced. 4 Abondoned It was dropped because differences on javascript complexity 5 Dec 2009 “strict mode” added, error checking improved, gettters and setters, support for JSON, improved introspection of Objects 5.1 June 2011 Editorial changes for fully aligned specs ECMA-262 6 June 2015 New syntax, classes, modules added, python style generator, for/of loop, promises, collections,
- 5. The earlier you start the better you are..
- 12. let & const
- 36. Sets, Maps, Weak Maps, Weak Sets Hexa Literal, Octa Literal Symbol Proxies Meta-Programming Localization & Internationalization Generators For-of loop
- 37. Feature Shim/Polyfill Transpiler Arrows and Lexical This Yes Classes Yes Enhanced Object Literals Yes Template Strings Yes Destructuring Yes Default, Rest, Spread Parameter Yes Let & Const Yes Iterators + For..Of Full Support Generator Full Support Unicode Yes Modules Transpiles to Common.js, AMD, System, and UMD Map + Set + WeakMap + WeakSet Full Support Proxies Unsupported Unsupported Symbols Limited Support Promises Full Support
- 38. ECMASCRIPT 262 [http://www.ecma-international.org/ecma-262/6.0/index.html] ES6 Shim [https://github.com/paulmillr/es6-shim/] Support Detail of ES6 [https://babeljs.io/docs/learn-es2015/]
Editor's Notes
- As we noticed in last slide ES5 was finalized in 2011 yet we are adopting its features and trying to use it since a couple of years back, but what did we wait for, We waited for browsers to support ES5 API.
- What if you want to use some of the features of ES2015 it will supply your browser the code that needs to support that feature What would be the output of 0===-0 // true What would be the output of NaN === NaN // false
- You CAN'T exit the limits of the destination language. You could, however, create a compatibility layer that emulates the missing features and provide the functionality somehow. In your example, if the foo internal function writefile() is the one that writes files, you could make a library that provides a writefile function that uses ajax to store the files to the server (or a cookie or localstore, etc). The original foo script wouldn't have to be changed for it to work. And this is precisely one of the main parts about writing a transpiler: You not only have to translate the language, but you also have to emulate the missing features. (you can also opt to disable the missing features)
- JavaScript is being introduced by full proof Classes inheritances features.