yarn
or
npm install
yarn start
or
npm start
strategy Options: "Base", "CustomOne", "CustomTwo"
curl --request POST \
--url http://localhost:8080/substitute \
--header 'content-type: application/json' \
--data '{
"strategy": "Base",
"values": {
"a": true,
"b": true,
"c": false,
"d": 2,
"e": 2,
"f": 2
}
}'
yarn test
or
npm test
I followed the principles of clean architecture to encapsulate the business logic from any type of framework. Once the business login was finished, I decided to use express to expose the service.
I used TDD during development
- Add a test
- Run all tests and see if the new test fails
- Write the code
- Run tests
- Refactor code
Because this test is oriented to a frontend position in which knowledge about TypeScrip and Node is required. I had to solve the exercise using TypeScript
If I would had to choose a language freely. I would have gone for a strongly typed language like Java or Go. These languages would speed up the development process (Better refactor tools) and 8457 would give robustness to the code
Thanks to Clean Architecture. I was able to choose which technology to use once I finished writing the business logic. I chose to expose a service with express since it is the easiest and fastest for a TestTask
I believe that I have respected the SOLID principles at all times. There are times where one principle can overlap the other. I am open to discuss these topics to exchange opinions and continue to improve
For code quality tests are available. It would be necessary to integrate a Code Coverage tool like Jacoco. I did not do it due to lack of time but it should not be very expensive, the tests are already available.
All classes are tested with Unit Tests and there is an integration test to test DefaultSubstitutorFactory
The API could be documented with swagger or some other tool that follows the OpenAPI specification
You are given a number of inputs and corresponding expressions for substitutions between inputs and outputs, and the expected output. The algorithm should be implemented using any approaches/ techniques that you find appropriate. Assignment can be implemented in any language of your choice, and you can use any framework / libraries that you wish. It’s up to you to decide how to control quality of implementation and what design/ approach to pick/ invent. Possible inputs
| Input | Type |
|---|---|
| A | bool |
| B | bool |
| C | bool |
| D | float |
| E | int |
| F | int |
The outputs are defined as:
| Output | Type |
|---|---|
| H | one of these predefined values [M,P,T] (e.g. H could be equal to either of 3 values: M, P or T) |
| K | floating point number (e.g. float, decimal) |
The assignment consists of base expressions set and two custom set of expressions that override / extend the base rules.
A && B && !C => H = M
A && B && C => H = P
!A && B && C => H = T
[other] => [error]
H = M => K = D + (D * E / 10)
H = P => K = D + (D * (E - F) / 25.5)
H = T => K = D - (D * F / 30)
H = P => K = 2 * D + (D * E / 100)
A && B && !C => H = T
A && !B && C => H = M
H = M => K = F + D + (D * E / 100)
Assignment could be implemented in a way of backend application and be exposed in a simple REST API or as browser based application and run within the browser with or without communication to the backend. Shape of implementation is up to you.