The official version of an Ecma International document is the English language version on the Ecma International website. References to Ecma International, except as required to translate it into languages other than English or into a different However, the content of this document itself may not be modified in any way, including by removing the copyright notice or Wholly or partly) the functionality therein. (iv) works by making use of this specification in standard conformant products by implementing (e.g. (iii) translations of this document into languages other than English and into different formats and (ii) works which incorporate all or portion of this document for the purpose of incorporating features that provide
(such as an annotated version of the document), (i) works which incorporate all or portion of this document for the purpose of providing commentary or explanation The only derivative works that are permissible under this Hoisting is JavaScript’s default behavior of moving all declarationsto the top of the current scope (to the top of the current script or the current function)(*).This document may be copied, published and distributed to others, and certain derivative works of it may be prepared,Ĭopied, published, and distributed, in whole or in part, provided that the above copyright notice and this Copyright License andĭisclaimer are included on all such copies and derivative works. Block-scoped variables and functionsīefore explaining blocked-scoped variables and functions, we need to understand what is hoisting. In this first part, the first 4 items will be covered. The features included in this version are :Īs you can see there are a lot of things to explain and understand so, I think it will be better to split these topics into 3 different posts. It implies that you can compile your code into an older version of ECMAScript to be supported in all browsers.ĮS6 has introduced some new useful features which I will explain as it follows: In that case, you can still use it but the only thing you need is a transpiler such as Babel.Īlso you can check if a feature is available in your browser using this tool.Ī transpiler is a source-to-source compiler, a tool that reads source code written in a unique programming language producing the equivalent code in another language. Although according to the ES compatibility table, the latest version of all major browsers has a very good support for ES6 features you may be wondering what happens if you want to use some features in a browser that doesn’t support it. If you are new to JavaScript, you may not know that each browser uses a different JavaScript engine:Įach JavaScript engine implements a subset of features of ES6. This version is also known as ES6 and ECMAScript 2015.
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