functional-requirements

Fullstack Pairing Exercise - Functional Requirements

Following are the functional requirements for our fullstack pairing exercise.

Please familiarise yourself with the business logic before the interview.

Inputs

Your program should take two command-line arguments:

• a JSON file representing a cart; and
• a JSON file representing a list of base prices.

You need not test that the input files conform with their schemas or handle errors that arise if they don't conform or if they don't go with each other (e.g. if there is no base price for a product type in the cart). We'd all want those tests in a production application, but in this exercise they tend to take time without adding interest.

Outputs

Your program should output the total price of the cart in cents followed by a newline character.

Data

• The cart schema is available at: cart.schema.json
• Some example carts are available at: cart-4560.json, cart-9363.json, cart-9500.json, and cart-11356.json
• The base price schema is available at: base-prices.schema.json
• An example of base prices is available at: base-prices.json

As an aid in testing your program, the name of each example cart file mentioned above includes the expected total price for that cart given the base prices in the example base prices file mentioned above.

Note that artist_markup is a percentage, so it will need to be divided by 100.

Products

You can assume that the options for a product-type are constant.

For example, if the first record with the product-type hoodie in the list of base prices only has the options colour and size, all records with the product-type hoodie in the list of base prices will have the options colour and size and will have no other options.

Your program should handle products with any options, even ones not found in the sample files.

Calculation

When calculating the total price of the cart, your program should calculate the price for one item as follows:

(base_price + round(base_price * artist_markup)) * quantity

The time your program takes to calculate a price should be constant with respect to the number of base prices. (In real life, Redbubble currently has more than 1,000 base prices.)