public/subjects/hello-there

Hello There 👋

Installation

For each programs, make sure you are downloading a version that works for your system

Install Visual Studio Code

• Download the installer https://code.visualstudio.com/download

If you already have and love a code editor, feel free to use it, but keep in mind that we will use VSCode as reference

VSCode is a code editor, it will give you an interface to write, test and submit your code.

Install Git

• Download the installer https://git-scm.com/downloads
• While installing, Git will ask a bunch of questions, it is recommended to change those:
  • Choosing the default editor (pick VSCode)
  • Configuring the line ending conversions (Choose : Checkout as-is, commit Unix-style line endings)
  • Otherwise stick with the defaults unless you know what you are doing.

Git is a versioning tool, we use it to upload your solutions on the school server.

Install Node.js

• Download the installer https://nodejs.org/en/download/current/

Node.js will allow to execute JavaScript code outside of the browser, useful for testing your code.

You can execute your JavaScript files with node like so:

$ node hello-world.js
Hello, world!

Values

There are 3 types of values, and they can model the WORLD !
(In the end it's all 1's and 0's for the computer), but us, humans, need an easier way of representing stuff.

We can all agree that 11010001100101110110011011001101111 is not a very friendly way to say 'hello' !

Numbers 🔢

• Whole numbers: 1, 23, 232139283
• Negative numbers are prefixed with -: -1, -1231
• Decimal numbers: 3.14, -2.53343 etc...

Use them for quantities like in daily life.

Booleans ✖️ / ✔️

• Something is true
• or false

They represent a truth, an answer to a closed-ended question (anything that can be answered with yes or no):

• Is paris the capital of France ? true
• Are you born before 1723 ? false
• Is your screen turned on ? true (most likely)

Strings 🆒

• 'Hello'
• 'This is some text'

A string is a sequence of characters used to represent text, it needs delimiters to define its begining and end.
Delimiters are matching quotes, either `, " or '.

Using console.log

To display output from a script into a console, use the function console.log:

console.log() // <- will show an empty line

Add any value between the parentheses to see it appear when the script is executed.

It is very important to use this often to validate that our code is valid. The more it is tested, the easier it is to understand what's going on in the code !

In doubt, console.log everything, don't be shy, they are for free.

Instructions

Once you have installed and configured the necessary tools, create in your Gitea account the repository named ((ROOT)) with a hello-there.js JS file that is a program that displays:

• the exact text Hello There !
• any Number
• and a Boolean.

In order to work in your repository and put files in it, you need to clone it first.

If your username was choumi this is the command that will need to be used:

git clone https://((DOMAIN))/git/choumi/((ROOT)).git

To execute it, open a Unix shell (e.g. Git Bash on Windows), you are going to type commands in it. This command needs to be adapted with your own username.

Don't forget to commit and push the file to the servers

Optional (git setting to avoid typing the password every time)

The ((ROOT)) repository will be the folder where all the exercises must be uploaded.

In order to avoid writing your username and password every time you git push an exercise, tell Git to remember your password (like a web browser would) with the below command:

git config --global credential.helper store

Recommendation

Videos designed to give hints are assigned to each quest. It is strongly suggested to watch them as you go.

You will learn about

• Code Editor
• Git
• JS