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

Date methods

In order to work with dates in JavaScript we use the built-in Date object. This object contains a lot of built-in functions to work with dates.

Creating dates

There are different ways to create a date. One way to create dates is by using the different constructors. You can see some examples here:

let currentDateTime = new Date();
console.log(currentDateTime);

This will log the current date and time, in this case:

2021-06-05T14:21:45.625Z

But, this way we are not using the built-in method, but the constructor. There is a built-in method, now(), that returns the current date and time, similar to what the no argument constructor does:

let now2 = Date.now();
console.log(now2);

This will log the current time, represented in seconds since January 1st 1970. This is an arbitrary date representing the Unix epoch. In this case:

1622902938507

We can add 1,000 milliseconds to the Unix epoch time:

let milliDate = new Date(1000);
console...