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Home > Programming > Programming Language > Learn ECMAScript
Learn ECMAScript
Learn ECMAScript

Learn ECMAScript: Discover the latest ECMAScript features in order to write cleaner code and learn the fundamentals of JavaScript , Second Edition

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Learn ECMAScript

Knowing Your Library

ES6/ES7/ES8 has added lots of new properties and methods to built-in JavaScript objects. These new functionalities aim to help developers avoid using hacks and error-prone techniques to do various operations related to numbers, strings, and arrays.

From the last chapter, you now know a decent amount of background details about JavaScript, how it works, its fundamentals, and basic stuff such as hoisting, scoping variables, and immutability. Now let's move on and take a look at some topics which you'll end up using practically all the time in your code.

In this chapter, we'll cover:

  • The new properties and methods of the Number, Object, Math, and Array objects
  • Representing numeric constants as binary or octal
  • Creating multiline strings and the new methods of the String object
  • Maps and sets
  • Using array buffers and typed arrays
  • How to iterate...

Working with numbers

ES6, ES2016 (ES7), and ES2017 (ES8) bring new ways of creating numbers and new properties to the Number object to make working with numbers easier. The Number object was enhanced greatly in ES6 to make it easier to create mathematically rich applications and prevent the common misconceptions that caused the errors.

The binary notation

Earlier, there was no native way to represent numeric constants as binary. But now, you can prefix numeric constants using the 0b token to make JavaScript interpret them as binary.
Here is an example:

let a = 0b00001111;
let b = 15;
console.log(a === b);
console.log(a);

The output is as follows:

true
15

Here, 0b00001111 is a binary representation of 15, base 10 decimal.

...

Doing math

ES6 and above add a lot of new methods to the Math object, related to trigonometry, arithmetic, and miscellaneous. This lets developers use native methods instead of external math libraries. Native methods are optimized for performance and have better decimal precision.

Trigonometry-related operations

Often there is a need to use mathematical functions related to trigonometry, exponential, logarithmic, and so on. JavaScript provides native methods for that to make our work easy.

The following example code, which shows all trigonometry-related methods that are added to the Math object:

console.log(Math.sinh(0)); //hyberbolic sine of a value
console.log(Math.cosh(0)); //hyberbolic cosine of a value
console...

Arrays

There are some new properties added to the global Array object and to its instances to make working with arrays easier. Arrays in JavaScript lacked features and capabilities when compared with programming languages such as Python and Ruby. Let's take a look at some popular methods associated with arrays and their use cases.

The Array.from(iterable, mapFunc, this) method

The Array.from() method creates a new array instance from an iterable object. The first argument is a reference to the iterable object. The second argument is optional and is a callback (known as the Map function) that is called for every element of the iterable object. The third argument is also optional and is the value of this inside...

Collections

A collection is an object that stores multiple elements as a single unit. ES6 introduced various new collection objects to provide better ways of storing and organizing data.

The array was the only collection object available in ES5. Now we have ArrayBuffers, SharedArrayBuffers, Typed Arrays, Sets, and Maps, which are built in collection objects.

Let's explore the different collection objects provided in JavaScript.

ArrayBuffer

Elements of arrays can be of any type, such as strings, numbers, objects, and so on. Arrays can grow dynamically. The problem with arrays is that they are slow in terms of execution time and occupy more memory. This causes issues while developing applications that require too much computation...

Objects

Objects have existed in JavaScript for a long time. They form the backbone of JavaScript, as almost every data type can be associated with objects. (new String(), new Number(), new Boolean(), and so on). You'll often find yourself working and manipulating objects all the time when working with web applications or JavaScript in general.

ES6, ES2016 (ES7), and ES2017 (ES8) introduce a lot of new properties and methods associated with objects. Let us take a look at them.

Object.values()

ES8 introduced the Object.values() method so that a programmer can retrieve all the values of an object as an array. This was earlier possible by manually iterating over every property of the object and storing its value in the...

Summary

In this chapter, we learned about new features added in ES8, ES7, and ES6 for working with numbers, strings, arrays, and objects. We saw how arrays impact performance in math-rich applications and how array buffers can be used instead. We also walked through the new collection objects provided by ES8.

In the next chapter, we will take a look at the Symbols and Iteration protocol, and we will also explore the yield keyword and generators. A lot of exciting and cutting-edge stuff is coming your way! Hold tight!

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Key benefits

  • • Grasp the latest features of ECMAScript and the best way to use it in production code
  • • Learn newly added native APIs to JS Engine and perform tasks efficiently with a cleaner code base
  • • Understand the more complex sides of JavaScript such as the inheritance model, low-level memory management, multithreaded environments, and web workers

Description

Learn ECMAScript explores implementation of the latest ECMAScript features to add to your developer toolbox, helping you to progress to an advanced level. Learn to add 1 to a variable andsafely access shared memory data within multiple threads to avoid race conditions. You’ll start the book by building on your existing knowledge of JavaScript, covering performing arithmetic operations, using arrow functions and dealing with closures. Next, you will grasp the most commonly used ECMAScript skills such as reflection, proxies, and classes. Furthermore, you’ll learn modularizing the JS code base, implementing JS on the web and how the modern HTML5 + JS APIs provide power to developers on the web. Finally, you will learn the deeper parts of the language, which include making JavaScript multithreaded with dedicated and shared web workers, memory management, shared memory, and atomics. It doesn’t end here; this book is 100% compatible with ES.Next. By the end of this book, you'll have fully mastered all the features of ECMAScript!

Who is this book for?

This book is for web developers who have some basic programming knowledge and want to learn to write cleaner code with the power of ECMAScript.

What you will learn

  • • Implement methods associated with objects as per the latest ECMAScript specification
  • • Make use of the latest features of ECMAScript
  • • Make use of many new APIs in HTML5 and modern JavaScript implementation
  • • Use SharedArrayBuffers for superfast concurrent and parallel programming
  • • Perform asynchronous programming with JavaScript
  • • Implement the best ways and practices to perform modular programming in JavaScript
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Feb 26, 2018
Length: 298 pages
Edition : 2nd
Language : English
ISBN-13 : 9781788620062
Category :
Programming
Languages :
JavaScript
Concepts :
Programming Language
Tools :
ECMAScript

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Product Details

Publication date : Feb 26, 2018
Length: 298 pages
Edition : 2nd
Language : English
ISBN-13 : 9781788620062
Category :
Programming
Languages :
JavaScript
Concepts :
Programming Language
Tools :
ECMAScript

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Table of Contents

13 Chapters
Getting Started with ECMAScript Chevron down icon Chevron up icon
Getting Started with ECMAScript
The let keyword
The const keyword
Immutability in JavaScript
Default parameter values
The spread operator
The rest parameter
Hoisting
Destructuring assignments
Arrow functions
Enhanced object literals
Trailing commas and JavaScript
The semicolon dilemma
Summary
Knowing Your Library Chevron down icon Chevron up icon
Knowing Your Library
Working with numbers
Doing math
Arrays
Collections
Objects
Summary
Using Iterators Chevron down icon Chevron up icon
Using Iterators
Symbols – primitive data type
The iteration protocol
Generator function
Tail call optimization
Summary
Asynchronous Programming Chevron down icon Chevron up icon
Asynchronous Programming
JavaScript execution model
The event loop
Writing asynchronous code
Promises and async programming
async/await – the future of asynchronous programming
Summary
Modular Programming Chevron down icon Chevron up icon
Modular Programming
JavaScript modules 101
Implementing modules – the old way
Implementing modules – the new way
Tree shaking
Using modules on the web
Summary
Implementing the Reflect API Chevron down icon Chevron up icon
Implementing the Reflect API
The Reflect object
Summary
Proxies Chevron down icon Chevron up icon
Proxies
Proxies in a nutshell
Working with the Proxy API
The uses of proxies
Summary
Classes Chevron down icon Chevron up icon
Classes
Understanding object-oriented JavaScript
Using classes
Using super in object literals
Summary
JavaScript on the Web Chevron down icon Chevron up icon
JavaScript on the Web
HTML5 and the rise of modern JavaScript
Modern JavaScript browser APIs
Summary
Storage APIs in JavaScript Chevron down icon Chevron up icon
Storage APIs in JavaScript
HyperText Transfer Protocol (HTTP)
Storing data with cookies
Working with localStorage
Working with SessionStorage
Handling storage changes across multiple tabs
Cookies versus local storage
The indexedDB - storing large data
Summary
Web and Service Workers Chevron down icon Chevron up icon
Web and Service Workers
An introduction to the concept of threads
Introduction to web workers
Checking if worker support is available
Working with dedicated web workers
Working with shared workers
Introduction to inline web workers
Same origin policy
Working with service workers
Summary
Shared Memory and Atomics Chevron down icon Chevron up icon
Shared Memory and Atomics
Basics of memory
What is shared memory?
Understanding parallel programming
What are atomics?
Fixing one billion count with atomics
A peek into Spectre
Summary
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With a title like "Learn ECMAScript" you would think this is a tutorial on JavaScript (AKA ECMAScript) that would be suitable for a beginner to learn from. In fact, the preface states (and this is a direct quote),"This book is for anybody who is absolutely new to JavaScript and is willing to learn this technology." Nothing could be farther from the truth. If you are "absolutely new to JavaScript," reading this book will make your head explode.Having said that, if you already know ECMAScript 5 or older versions of JavaScript, this book does give good explanations about what has been added in later editions of the language. But newbies should stay away.
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About the authors

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Profile icon Mohan
Mohan
Vineeth Mohan is an architect and developer. He currently works as the CTO at Factweavers Technologies and is also an Elasticsearch-certified trainer. He loves to spend time studying emerging technologies and applications related to data analytics, data visualizations, machine learning, natural language processing, and developments in search analytics. He began coding during his high school days, which later ignited his interest in computer science, and he pursued engineering at Model Engineering College, Cochin. He was recruited by the search giant Yahoo! during his college days. After 2 years of work at Yahoo! on various big data projects, he joined a start-up that dealt with search and analytics. Finally, he started his own big data consulting company, Factweavers. Under his leadership and technical expertise, Factweavers is one of the early adopters of Elasticsearch and has been engaged with projects related to end-to-end big data solutions and analytics for the last few years. There, he got the opportunity to learn various big-data-based technologies, such as Hadoop, and high-performance data ingress systems and storage. Later, he moved to a start-up in his hometown, where he chose Elasticsearch as the primary search and analytic engine for the project assigned to him. Later in 2014, he founded Factweavers Technologies along with Jalaluddeen; it is consultancy that aims at providing Elasticsearch-based solutions. He is also an Elasticsearch-certified corporate trainer who conducts trainings in India. Till date, he has worked on numerous projects that are mostly based on Elasticsearch and has trained numerous multinationals on Elasticsearch.
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Profile icon Narayan Prusty
Narayan Prusty
Narayan Prusty is a full-stack developer. He works as a consultant for various start-ups around the world. He has worked on various technologies and programming languages but is very passionate about JavaScript, WordPress, Ethereum, Solr, React, Cordova, MongoDB, and AWS. Apart from consulting for various start-ups, he also runs a blog titled QNimate and a video tutorial site titled QScutter, where he shares information about a lot of the technologies he works on.
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  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela