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
Other Books You May Enjoy
17
Index

Math methods

The Math object has many methods that we can use to do calculations and operations on numbers. We will go over the most important ones here. You can see all the available ones when you use an editor that shows suggestions and options during typing.

Finding the highest and lowest number

There is a built-in method max() to find the highest number among the arguments. You can see it here:

let highest = Math.max(2, 56, 12, 1, 233, 4);
console.log(highest);

It logs 233, because that's the highest number. In a similar way, we can find the lowest number:

let lowest = Math.min(2, 56, 12, 1, 233, 4);
console.log(lowest);

This will log 1, because that is the lowest number. If you try to do this with non-numeric arguments, you will get NaN as a result:

let highestOfWords = Math.max("hi", 3, "bye");
console.log(highestOfWords);

It is not giving 3 as output, because it is not ignoring the text but concluding that it...