shiny13 / node-js-tutorials

This project contains exercises from Andrew Mead's Node.js tutorial

Node.js Tutorials

This project contains exercises from Andrew Mead's Node.js tutorial:
The Complete Node.js Developer Course (3rd Edition)

Lesson 1 - Hello World

This lesson prints a console message to the terminal. The user must use the following command to print the message to the terminal:
node hello.js

Lesson 2 - Notes app

This lesson teaches you to make a console application with Node.js.
Here you can follow the code and learn how to use the library yargs to accept command like arguments while running the node.js application

Run the app by the following command:
node app.js
Followed by one of these parameters:

• add
• remove
• list
• read

Each command may have their own option parameters as described below.

Add command usage

The add command can be invoked with two mandatory string option parameters: title and body, where it will add a json array to the file: notes.json.
Example: node app.js add --title="List" --body="Sweater, Pants"
Here the app is run with the add command and two options:
Title: "List"
Body: "Sweater, Pants"

Remove command usage

The remove command can be invoked with one mandatory string option parameters: title where it will locate that title and remove it from the json file: notes.json.
Example: node app.js remove --title="List"
Here the app is run with the remove command and one options:
Title: "List"

List command usage

The list command reads the contents from json file: notes.json and parses them to a list of objects containing the title and body properties.
Example: node app.js list

Read command usage

The read command can be invoked with one mandatory string option parameters: title where it will print the title and body by reading it from the json file: notes.json.
Example: node app.js read --title="List"
Here the app is run with the remove command and one options:
Title: "List"

New Lesson 2 - Notes app

This lesson teaches you to make a console application with Node.js. Here we will use a built in node.js library called fs to manipulate files.

To import a library the require() is used with the library name as parameter as follows: const fs = require('fs')

Then the variable fs can be used within the file to invoke methods in the library. fs.writeFileSync('notes.txt', 'My name is Shahnawaz.') NB: The following website has information on npm libraries: https://www.npmjs.com/

To import a file in the current file, the require() can be used as follows: const utils = require('./utils.js') NB: the utils.js must export the methods and variables to be used in the new file as follows: module.exports = { name, add, multiply } Here name is a variable and add and multiply are javascript functions.