A code challenge by Colin Harrington. Also a bad play-on-words relating to a bookstore.
Tools utilized:
- Node 14
- Typescript
- Express
- sqlite
- docker
docker build . -t lanazon
docker run -p 3000:3000 lanazon- Swagger UI at http://localhost:3000/api-docs
- List all Products: http://localhost:3000/api/products
- Checkout endpoint: http://localhost:3000/api/checkout
Beyond using swagger and the codebase to look at using this API here are cURL commands for the three scenarios below:
Scanned Items: MacBook Pro, Raspberry Pi B Total: $5,399.99
curl --header "Content-Type: application/json" \
--request POST \
--data '{"cart":{"43N23P":1,"234234":1}}' \
http://localhost:3000/api/checkoutYields:
{
"lineItems":[
{
"product":{
"sku":"234234",
"name":"Raspberry Pi",
"price":30,
"qty":2
},
"quantity":1,
"amount":30,
"total":0,
"discount":{
"amount":30,
"description":"Each sale of a MacBook Pro comes with a free Raspberry Pi B"
}
},
{
"product":{
"sku":"43N23P",
"name":"MacBook Pro",
"price":5399.99,
"qty":5
},
"quantity":1,
"amount":5399.99,
"total":5399.99
}
],
"total":5399.99
}Scanned Items: Google Home, Google Home, Google Home Total: $99.98
curl --header "Content-Type: application/json" \
--request POST \
--data '{"cart":{"120P90":3}}' \
http://localhost:3000/api/checkoutYields:
{
"lineItems":[
{
"product":{
"sku":"120P90",
"name":"Google Home",
"price":49.99,
"qty":10
},
"quantity":3,
"amount":149.97,
"total":99.98,
"discount":{
"amount":49.99,
"description":"Buy 3 Google Homes for the price of 2"
}
}
],
"total":99.98
}Scanned Items: Alexa Speaker, Alexa Speaker, Alexa Speaker Total: $295.65
curl --header "Content-Type: application/json" \
--request POST \
--data '{"cart":{"A304SD":3}}' \
http://localhost:3000/api/checkoutYields
{
"lineItems":[
{
"product":{
"sku":"A304SD",
"name":"Alexa Speaker",
"price":109.5,
"qty":10
},
"quantity":3,
"amount":328.5,
"total":295.65,
"discount":{
"amount":32.85,
"description":"Buying more than 3 Alexa Speakers will have a 10% discount on all Alexa speakers"
}
}
],
"total":295.65
}Welcome to our backend challenge. We’re excited that you’ve decided to invest your time in completing this exercise and we’re looking forward to reviewing your code. There’s no time limit to complete this assignment although we recommend spending between 3 to 6 hours.
Please use NodeJS as runtime environment and Typescript / Javascript as the programming language for this coding exercise and provide either a Dockerfile or clear build instructions to run your application. You can also use any Javascript frameworks or libraries as long as they don’t solve the core problem for you. We’re looking for code that is readable, extensible, with functioning unit and/or integration tests, proper use of logging, and error handling. Documentation is also important on your thought process, usage instructions, and how you would invest further time in making your solution better.
Have you shopped online? Let’s imagine that you need to build the checkout business logic that will support different promotions with the given inventory. Build a checkout system as a standalone NodeJS API with these items:
| SKU | Name | Price | Qty |
|---|---|---|---|
| 120P90 | Google Home | $49.99 | 10 |
| 43N23P | MacBook Pro | $5,399.99 | 5 |
| A304SD | Alexa Speaker | $109.50 | 10 |
| 234234 | Raspberry Pi B | $30.00 | 2 |
The system should have the following promotions:
- Each sale of a MacBook Pro comes with a free Raspberry Pi B
- Buy 3 Google Homes for the price of 2
- Buying more than 3 Alexa Speakers will have a 10% discount on all Alexa speakers
Example Scenarios:
- Scanned Items: MacBook Pro, Raspberry Pi B Total: $5,399.99
- Scanned Items: Google Home, Google Home, Google Home Total: $99.98
- Scanned Items: Alexa Speaker, Alexa Speaker, Alexa Speaker Total: $295.65
Please provide appropriate documentation on how to interact with your API (i.e. Readme file, curl commands, or POSTman scripts, etc.). Thank you for your time and we look forward to reviewing your solution.