Studying Node.js through the NodeBR course.

Versão em Português-BR

• Created by Ryan Dahl in 2009. Node.js is a platform for building backend applications using JavaScript.

• NPM (stands for Node Package Manager) is responsible for managing the dependencies(package.json) of the project.

• Install Node.js in your computer https://nodejs.org/en/.
• Run the command node --version, to check the version of the node that is installed on your computer.

• To start a node.js project, run the command npm init (or npm init -y to run as the default settings).

NPM also can be used to write line commands.

In the package.json file:

"scripts": {     "dev": "node index.js" },

In this code snippet, it is showed the function "dev".

To execute line commands with NPM it is used the command npm run "name-of-your-function", with base of the code above, it would be npm run dev.

• Functions that need external resources (access to database or files) will be running in the background.
• The code does not run sequentially.
• Remember to keep the sequence of your program to avoid problems.

• Pending: Initial state, not yet finished or not rejected yet.
• Fulfilled: After performing all operations successfully.
• Rejected: Operation failed.

Async The word “async” before a function means that this function always returns a promise. Await it just works only inside async functions and makes JavaScript wait until that promise settles and returns its result.

• It makes it easy for the visualization of the flow of functions.
• It does not change the performance of your application (if used correctly).
• Already existing in C # was developed in JavaScript.
• Use only when you need to wait for the call's answer (Await).

• Used for continuous actions.
• Node.js uses for almost everything in your ecosystem.
• Quite also used in browsers (.onClick).
• It work under Design Pattern Observer / PubSub]

• npm init -y -> Start Node.js project
• npm install axios -> Insall Axios Lib
• npm install -g mocha -> Install Mocha globally
• npm i --save-dev mocha -> Install Mocha as a development dependency
• npm install nock -> Install the Nock package. It's used to simulate requests