# Simple calculator

This calculator project contains a simple Angular based frontend, and a Spring based backend.

## Environment

To compile and run this project the following software needs to be installed and available on the
path. Versions used for development are listed.

- Maven (3.6.3)
- Java JDK (OpenJDK 11.0.9.1)
- NPM (7.1.0)
- Node.js (v12.19.0)
- Angular (11.0.3)
 
## Backend

To (somewhat) stay in line with RESTful principles, the backend api models a number as a resource 
on which calculations can be applied. This makes it possible to avoid hardcoding arithmetic 
operations in the frontend and use HATEOAS links instead. The latter is not implemented. 

### Compiling and running

Navigate into the `backend` directory and run `mvn spring-boot:run`.
Integration and unittests can be run using `mvn verify`. 

### Example api call

Navigate to ` http://localhost:8080/numbers/5/add/15 ` in a browser and observe the response.

## Frontend

### Compiling and running

Make sure the backend is started first.
Navigate to the `frontend` directory and run `npm install` followed by `ng serve`
To access the UI navigate to ` http://localhost:4200/ ` with a browser.
Unittests can be run using `ng test`.
Integration test can be run using `ng e2e`

## Author
Harry de Boer

email: hdboer@quintor.nl