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

Updating documents in MongoDB

It is possible to modify one or more documents of a collection. The updateOne() and updateMany() class methods are used respectively to modify the first document found or all of the documents found.

These two methods have similar parameters:

  • updateMany(conditions, update, callback) indicates modifying the data indicated in the update object on the documents specified by the indicated conditions. The callback function of the form callback(err, response) is called after the update.
  • updateOne(conditions, update, callback) indicates modifying the data indicated in the update object on the first document found by the indicated conditions. The callback function of the form callback(err, response) is called after the update.
  • Only the conditions and update parameters are mandatory in the two methods.

    Warning

    If the callback is not present in the method, you must use the then() or exec() method afterward, otherwise the update is not done.

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