Information:

• description of the problem
• description of how the problem was solved
• instructions how to run the code
• license

Start a node project with

npm init

and configure the package.json file.

Create a route to test the application, where it receives a character and return the response in JSON format.

Route example

http://url:{port}/arabic?character=10

Receive a string with a roman numeral, like CCXII, and convert it to its arabic numerals, 212.

Considering the roman characters and its values:

• For each character on a string, convert it to its value and sum them all.
• If the value of the next character is bigger, then subtract instead of sum

Not allowed operations

• any other character that does not belong to the roman numeral character list
• more than 3 repetitions of any character
• multiple repetition of the characters: [ V, L, D ]
• multiple subtractions of the characters: [ I, X, C ]

Install express

npm i -S express

and its types:

npm i -D @types/express

Add gitignore to the following environment:

• node
• vscode

Install husky

npm install husky --save-dev

Create a route to test the application, where it receives a character and return the response in JSON format.

Route example

http://url:{port}/roman?character=X

Install and configure typescript with:

npm i -D typescript ts-node

and

npx typescript --init

Update the tsconfig.json to configure the rootDir and outDir

Install eslint configured to airbnb:

npx eslint --init

Install prettier

npm install --save-dev --save-exact prettier

To convert the biggest roman number, four Ms are needed:

MMMCMXCIX

The validation that asserts only 3 character occurrences of each letter must have an exception if the character requested is M.

Install nodemon

npm i -D nodemon

Then configure the server.

Install Jest

npm i -D jest @types/jest ts-jest