Book Image

Web Developer's Reference Guide

By : Joshua Johanan, Talha Khan, Ricardo Zea
Book Image

Web Developer's Reference Guide

By: Joshua Johanan, Talha Khan, Ricardo Zea

Overview of this book

This comprehensive reference guide takes you through each topic in web development and highlights the most popular and important elements of each area. Starting with HTML, you will learn key elements and attributes and how they relate to each other. Next, you will explore CSS pseudo-classes and pseudo-elements, followed by CSS properties and functions. This will introduce you to many powerful and new selectors. You will then move on to JavaScript. This section will not just introduce functions, but will provide you with an entire reference for the language and paradigms. You will discover more about three of the most popular frameworks today—Bootstrap, which builds on CSS, jQuery which builds on JavaScript, and AngularJS, which also builds on JavaScript. Finally, you will take a walk-through Node.js, which is a server-side framework that allows you to write programs in JavaScript.
Table of Contents (22 chapters)
Web Developer's Reference Guide
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
9
JavaScript Expressions, Operators, Statements, and Arrays
Index

ECMAScript 6 features


ECMAScript 6, otherwise called ECMAScript 2015, is the most recent form of the ECMAScript standard. ES6 is an important upgrade to the language, and the first update to language since the release of ES5.1 in June 2011

A few of the new features of ES6 are:

  • Arrow functions

  • Classes

  • Enhanced object literals

  • Destructuring assignment

  • Extended parameter handling

  • Generator

  • Modules

  • Proxy

We will look at all these functions in the upcoming sections.

Arrow functions

Arrow functions are also known as fat arrow functions. It is a function and is similar to what we use in C#, Java, and Coffee Script. Statements and expression bodies are supported by arrows. The lexical of arrows is similar to its surrounding code. This is not the case in functions.

As the name suggests, arrow functions use a shorter syntax, an arrow (=>), for definition and in syntax.

For example, look at the following example:

// An empty arrow function returns undefined
let empty =()=>{};

(()=>"pine")()// returns "pine...