Welcome to the Clojure programming assignment for the position as Clojure Backend Developer!

Every time someone works with a particular task, they gain experience. If they enjoy doing the task this is a positive experience, but if they don't enjoy it it probably just wears them out. Your job is to analyse data on this using clojure and then given a particular task be able to rank the persons who would most likely want to do the task and do it well.

The dataset consists of CSV files with the following columns:

• Date: Date in ISO-8601 format
• TaskID: Task ID in ObjectId format
• PersonID: Person ID in ObjectId format
• Rating: Users rating of the experience from 1 (terrible) to 5 (amazing)

Example:

Date,TaskID,PersonID,Rating
2021-10-01;6156dc9dc1f742f8e11aa14d;6156dca47fe5761a20b92b1d;4
2021-10-01;6156dc9dc1f742f8e11aa14d;6156dcb90ba5173d292c9afe;2
2021-10-02;6156dc9dc1f742f8e11aa14d;6156dcb90ba5173d292c9afe;3

In this short example two persons have worked with the same task on the same day, one of them giving it a rating of 4 (pretty nice) and the other a rating of 2 (bad).

Each day of experience gives the user a score for a particular task depending on the rating:

• Rating 1 -> Score -2
• Rating 2 -> Score -1
• Rating 3 -> Score 1
• Rating 4 -> Score 2
• Rating 5 -> Score 3

Scoring is accumulative and adds together for each row in the input about the same person. In the example above:

• Two persons, 6156dca47fe5761a20b92b1d and 6156dcb90ba5173d292c9afe, both starts with score 0.
• First row gives person 6156dca47fe5761a20b92b1d a score of 2 points (since they gave rating 4 to the task on that day)
• Second row gives person 6156dcb90ba5173d292c9afe a score of -1 (since they gave rating 2)
• Third row adds 1 to the score for person 6156dcb90ba5173d292c9afe, landing them on score 0. After all rows person 6156dca47fe5761a20b92b1d has score 2 and person 6156dcb90ba5173d292c9afe has score 0.

The program should accept two inputs:

• the first is the filename containing the ratings for previous dates
• the second is a TaskId to evalute the score for

The program should output a sorted list of PersonID, with the person with the highest score for that task coming first (ie. the most number of positive experiences) down to the person with the lowest score at the bottom. With the example above:

$ lein run small-example.csv 6156dc9dc1f742f8e11aa14d
6156dca47fe5761a20b92b1d;2
6156dcb90ba5173d292c9afe;0

Fork this repo to get the instructions and example data and then when your assignment is working, send a link over teamtailor.