Clean code and unit testing

Each of the folders contain the example code for a specific lecture.

Commands to build and run

Ensure you already installed the latest nodejs LTS version: https://nodejs.org/en/download

# install Typescript globally
npm i typescript -g

# install the dependencies, packages
npm install

# build the project, the compiled Javascript file will be in the /dist folder
# the command is configured in the package.json file
npm run build

# execute the unit tests
npm run test