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Descriptors provide an attribute that describe a property in an object. The attributes i. ES added the Object. This method returns an object containing all the own property descriptors for a given object. ES5 added Object.
In other words, JSON. Objects, Arrays, Strings, Numbers, Booleans etc ES will allow trailing commas when defining function parameters or calling a function with arguments. However, calling a function with a comma alone or defining a function parameter as a comma alone will throw a SyntaxError.
Given this change, new updates to the language moving forward would be given the titles ES i. This chapter digs into some of these details.
In short, both modern day Node and modern web browser engines mostly have full support for ES starting with Node 6.
Both TypeScript and Babel can be configured to interpret staged proposals. The vanilla sandbox uses Parcel which uses Babel and babel-preset-env by default.
Most of the code examples in this book can be run in codesandbox. It can be used in place of the Node. Keep in mind that most of ES has been supported in Node since 6. Personally, I prefer using Quokka. I setup Quokka to use babel-preset-env and stage Typically, this involves using a module bundler that makes use of Babel or Typescript during development and production bundling.
Babel Polyfill is automatically loaded when using babel-node. For example, it can take arrow function syntax and convert it to ES5 syntax. Compiling does not come without caveats. In other words, Babel does not exist so non-standard language features can be bolted on to the language. However, TypeScript views non-standard language updates as a core part of its purpose for existing e.
The good thing about this book is that you can try the examples on the fly, books give you the option to edit and run it right there from the book itself. The integration of the code examples into the text is really smooth.
Code examples are not trivial and help to understand the concept better.