Book Image

JavaScript from Beginner to Professional

By : Laurence Lars Svekis, Maaike van Putten, Codestars By Rob Percival
4 (5)
Book Image

JavaScript from Beginner to Professional

4 (5)
By: Laurence Lars Svekis, Maaike van Putten, Codestars By Rob Percival

Overview of this book

This book demonstrates the capabilities of JavaScript for web application development by combining theoretical learning with code exercises and fun projects that you can challenge yourself with. The guiding principle of the book is to show how straightforward JavaScript techniques can be used to make web apps ranging from dynamic websites to simple browser-based games. JavaScript from Beginner to Professional focuses on key programming concepts and Document Object Model manipulations that are used to solve common problems in professional web applications. These include data validation, manipulating the appearance of web pages, working with asynchronous and concurrent code. The book uses project-based learning to provide context for the theoretical components in a series of code examples that can be used as modules of an application, such as input validators, games, and simple animations. This will be supplemented with a brief crash course on HTML and CSS to illustrate how JavaScript components fit into a complete web application. As you learn the concepts, you can try them in your own editor or browser console to get a solid understanding of how they work and what they do. By the end of this JavaScript book, you will feel confident writing core JavaScript code and be equipped to progress to more advanced libraries, frameworks, and environments such as React, Angular, and Node.js.
Table of Contents (19 chapters)
16
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17
Index

Summary

In this chapter, we dealt with the first two programming building blocks: variables and operators. Variables are special fields that have a name and contain values. We declare a variable by using one of the special variable-defining words: let, var, or const. Variables enable us to make our scripts dynamic, store values, access them later, and change them later. We discussed some primitive data types, including strings, numbers, Booleans, and Symbols, as well as more abstract types such as undefined and null. You learned how to determine the type of a variable using the typeof word. And you saw how you can convert the data type by using the built-in JavaScript methods Number(), String(), and Boolean().

Then we moved on and discussed operators. Operators enable us to work with our variables. They can be used to perform calculations, compare variables, and more. The operators we discussed included arithmetic operators, assignment operators, comparison operators, and logical...