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ECMAScript Cookbook

You're reading from   ECMAScript Cookbook Over 70 recipes to help you learn the new ECMAScript (ES6/ES8) features and solve common JavaScript problems

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Product type Paperback
Published in Mar 2018
Publisher Packt
ISBN-13 9781788628174
Length 348 pages
Edition 1st Edition
Languages
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Author (1):
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Ross Harrison Ross Harrison
Author Profile Icon Ross Harrison
Ross Harrison
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Table of Contents (14) Chapters Close

Preface 1. Building with Modules FREE CHAPTER 2. Staying Compatible with Legacy Browsers 3. Working with Promises 4. Working with async/await and Functions 5. Web Workers, Shared Memory, and Atomics 6. Plain Objects 7. Creating Classes 8. Inheritance and Composition 9. Larger Structures with Design Patterns 10. Working with Arrays 11. Working with Maps and Symbols 12. Working with Sets 13. Other Books You May Enjoy

Getting the head and tail of array using the rest operator

Using destructuring to pick out elements is convenient, but we don't always want to pull out every element. A commonly useful pattern is to get the zeroth element of an array assigned to one variable, and the rest of the elements in another. This is commonly called the head and tail of an array.

In this recipe, we'll take a look at how to use the rest operator to get the head and tail of an array.

Getting ready

This recipe assumes that you already have a workspace that allows you to create and run ES modules in your browser. If you don't, refer to the first two chapters.

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