Titlebook: JavaScript Next; Your Complete Guide Raju Gandhi Book 2019 Raju Gandhi 2019 ES6.ES7.ES8.ES9.ECMAScript.JavaScript.frameworks.libraries.mod

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Metamorphosis with Proxy and Reflect,tional behavior we wanted to see on any object. Symbols can help in this regard, by giving us the guarantee of collision-free keys. However, in many cases it can feel a tad hackish, especially when we do not wish to . modify behavior of an object for the lifetime of our application.

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, and , — The New Declarations on the?Block,The use of variables in JavaScript, like in many other languages, is pervasive. Assignments, arguments to function calls, and results of computations; variables are everywhere. Simply put, they allow us to store the “state” of a program.

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,Maps and Sets—The New Data-structures on the Block,A programming language must provide us with all of the necessary constructs that empower developers to model their domain and problem space clearly and efficiently. Till date, JavaScript lacked support for two fundamental types that most other languages offer, namely maps and sets. This changes in ES6.

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Namespacing Code Using Modules,JavaScript’s answer to “packaging” or name-spacing can be expressed rather succinctly—it was nonexistent. This has been one of the most glaring omissions in the language design since the beginning, and has led to a variety of attempts at modularizing code. These ranged from homegrown solutions to full-blown specifications like AMD.

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,Asynchronous Iterators and Generators—A Meeting of the?Minds,The idea of generators is tempting, and it tends to spoil us. We are no longer afraid to work with large or infinite sequences and streams. However, while generators are great at working with values, they were never designed for working with promises.

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https://doi.org/10.1007/978-1-4842-5394-6ES6; ES7; ES8; ES9; ECMAScript; JavaScript; frameworks; libraries; modern javascript

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