Solution for a technical question for Fetch
If you have docker installed on your host machine, running this web service is very simple. Simply clone the repo, and in the top-level directory run:
docker-compose up
This brings up a docker container running Node 12.10.0 and starts the web service, listening locally to port 3000
If you do not have docker installed on your host machine, just install it!! Ok, if you really don't want to use docker, running this web service is still very straightforward. You will need NodeJS / npm installed on your system (I tested with node v12.10.0).
After cloning the repo, go to the top-level directory and run:
npm install
npm start
This should start the web service, listening locally to port 3000.
This web service provides a REST api with a single endpoint: /pyramid. This endpoint takes a query parameter: word, which must be a string with all letters, no punctuation or spaces.
The endpoint will return a status of 200 and a value of true or false depending on if the word parameter is a "pyramid word". A word is a 'pyramid' word if you can arrange the letters in increasing frequency, starting with 1 and continuing without gaps and without duplicates.
Examples: banana is a pyramid word because you have 1 'b', 2 'n's, and 3 'a's. bandana is not a pyramid word because you have 1 'b' and 1 'd'.
Example Endpoing calls:
http://localhost:3000/pyramid?word=banana (returns 200, true)
http://localhost:3000/pyramid?word=bandana (returns 200, false)
http://localhost:3000/pyramid?word=ban%20ana (returns 422)