Book Image

JavaScript from Frontend to Backend

By : Eric Sarrion
Book Image

JavaScript from Frontend to Backend

By: Eric Sarrion

Overview of this book

JavaScript, the most widely used programming language in the world, has numerous libraries and modules and a dizzying array of need-to-know topics. Picking a starting point can be difficult. Enter JavaScript from Frontend to Backend. This concise, practical guide will get you up to speed in next to no time. This book begins with the basics of variables and objects in JavaScript and then moves quickly on to building components on the client-side with Vue.js and a simple list management application. After that, the focus shifts to the server-side and Node.js, where you’ll examine the MVC model and explore the Express module. Once you've got to grips with the server-side and the client-side, the only thing that remains is the database. You’ll discover MongoDB and the Mongoose module. In the final chapter of this fast-paced guide, you'll combine all these pieces to integrate a Vue.js application into a Node.js server, using Express to structure the server code and MongoDB to store the information. By the end of this book, you will have the skills and confidence to successfully implement JavaScript concepts in your own projects and begin your career as a JavaScript developer.
Table of Contents (14 chapters)
1
Part 1: JavaScript Syntax
4
Part 2: JavaScript on the Client-Side
8
Part 3: JavaScript on the Server-Side

Multitasking in JavaScript

When you start coding in JavaScript, a question often comes up: is it possible to perform several processes simultaneously (what is called multitasking in computing)? This would be useful if a process to be executed will take a long time, so as not to block other equally urgent processes.

JavaScript does not allow several processing operations to be carried out simultaneously. On the other hand, it is possible not to block the program (both on the client side in the browser, and on the server side with Node.js) by using the callback function (which we have already talked about when studying the forEach()method in the Accessing an element with the forEach(callback) method section).

Callback Function

A callback function corresponds to a processing function used as parameters of a JavaScript method or function. The callback function will be executed at the desired time by the method or function that uses it.

Node.js makes extensive use of this feature...