I came across some old codes that I wrote as a tech test solution while I was applying a software engineer role for an ecommerce company few years back in 2016. I remember as it was one of the more interesting code kata amongst many tech test that I had done. It was meant to be a straight-forward 2 hours exercise solving what it looked like an easy little problem.
https://www.stellalie.com/2019/10/06/design-pattern-rules-engine/
The Nile wants to offer a wide variety of discounts to our customers.
Your task is to develop a system to allow for discounts to be applied to a customers cart. The system should be flexible, allowing for the creation of new discount types easily.
Given these products:
| SKU | Name | Price |
|---|---|---|
| 9325336130810 | Game of Thrones: Season 1 | $39.49 |
| 9325336028278 | The Fresh Prince of Bel-Air | $19.99 |
| 9780201835953 | The Mythical Man-Month | $31.87 |
| 9781430219484 | Coders at Work | $28.72 |
| 9780132071482 | Artificial Intelligence | $119.92 |
| -------------- | ------------------------------ | ---------- |
Initially we would like to offer our customers these discounts:
- Buy 10 or more copies of The Mythical Man-Month, and receive them at the discounted price of $21.99
- We would like to offer a 3 for the price of 2 deal on Coders at Work. (Buy 3 get 1 free);
- Customers who purchase Game of Thrones: Season 1, will get The Fresh Prince of Bel-Air free.
Examples:
Products in cart: 9780201835953 x 10, 9325336028278 Expected total: $239.89
Products in cart: 9781430219484 x 3, 9780132071482 Expected total: $177.36
Products in cart: 9325336130810, 9325336028278, 9780201835953 Expected total: $71.36
Example interface:
$cart = new Cart($pricingRules); $cart->addProduct("9780201835953"); $cart->addProduct("9781430219484"); $cart->total();
- use any language you wish
- do not use any external libraries (Zend etc.)
- do not use a database
- do not create a GUI (we are only interested in your implementation)
- try not to spend more than two hours on this, we don't want you working all day!
See comments on runner.php, to run:
php runner.php