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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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Profile Icon MOHAN Profile Icon Vineeth Mohan Profile Icon Narayan Prusty Profile Icon Narayan Prusty
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Paperback Feb 2018 298 pages 2nd Edition
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Profile Icon MOHAN Profile Icon Vineeth Mohan Profile Icon Narayan Prusty Profile Icon Narayan Prusty
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Paperback Feb 2018 298 pages 2nd 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

Product Details

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Publication date : Feb 26, 2018
Length: 298 pages
Edition : 2nd
Language : English
ISBN-13 : 9781788620062
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Product Details

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

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Table of Contents

13 Chapters
Getting Started with ECMAScript Chevron down icon Chevron up icon
Knowing Your Library Chevron down icon Chevron up icon
Using Iterators Chevron down icon Chevron up icon
Asynchronous Programming Chevron down icon Chevron up icon
Modular Programming Chevron down icon Chevron up icon
Implementing the Reflect API Chevron down icon Chevron up icon
Proxies Chevron down icon Chevron up icon
Classes Chevron down icon Chevron up icon
JavaScript on the Web Chevron down icon Chevron up icon
Storage APIs in JavaScript Chevron down icon Chevron up icon
Web and Service Workers Chevron down icon Chevron up icon
Shared Memory and Atomics Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

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Full star icon Full star icon Full star icon Full star icon Empty star icon 4
(1 Ratings)
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JWS Dec 02, 2018
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
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.
Amazon Verified review Amazon
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