Git commands

git init - inicia o repositório

git remote / git remote -v - manage set of tracked repositories -v stands for verbose

git status - vê o que foi added e o que não foi

git add filename - adiciona o filename para fazer commit

git add . - adiciona tudo para fazer commit

git commit -a -m "message" -a -> shortcut se quisermos fazer commit logo de ficheiros modified, não de new files.

git commit -am "message" - shortcut do supramencionado.

git commit -m "message" - fazer commit a aquilo que foi added. tem de ter mensagem que descreva o que foi commit ou o porquê do commit

git log - log os vários commits do repositório

heroku commands

heroku --version - check if instaled

heroku login

heroku create or heroku create name

git push heroku master - remote name is heroku, to connect git with heroku, so he can run the code

heroku open - opens the link of our app

heroku logs - view server logs

npm commands

npm install --production - only instals dependencies

npm install - install all dependencies and devDependencies

firebase commands

firebase.database() - access database funcionalities of the firebase module

.ref() - reference to a specific part of the database. If no arguments are provided, ref points to the root (expensify-b9ec9-default-rtdb)

.set() - set value for the ref. Accepts any data type - string, number.. etc. It's assynchronous, has to send data to server. while doing that, it reads the next lines on the code

promises

Can only do ONE resolve OR reject. If we pass two resolves, only the first will run.

Resolve: only takes one argument. If needed, pass an object with the properties. Reject: only takes one argument.

.then(()=>{}) - only fires for resolves. For rejects, throws a javascript error. to handle error, add .catch(()=>{})