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Process the data

Nelisa would like to analyze weekly records of her sales to understand her business better.

Nelisa would like to find out:

• the most popular product sold each week;
• the least popular product sold each week;
• the most popular category sold each week;
• the least popular category sold each week.

She is also been keeping track of the products she bought each week.

She would also like to calculate:

• the most profitable product for each week;
• the most profitable category for each week.

Write a program that reads the files for each week and print the results to the screen in a format that can be sms’ed to her.

The data

• week1.csv
• week2.csv
• week3.csv
• week4.csv
• purchases.csv

Things to Remember

• write unit tests using Mocha;
• modularize your code;
• write small focussed functions.

Learning areas

• Data processing algorithms
  • Grouping data
  • Filtering data