A web calculator using RESTful API principles in a Haskell environment
In order to setup this application you must have stack, yesod and cabal installed on your machine.
To launch type the following into the terminal:
> cd WebCalculator
> stack build
> stack exec webcalculator
This will intialise the web application on localhost:3000, and will default you to the / route.
The API allows for 4 operations to be carried out: Addition, Subtraction, Mulitplication and Division. They are all used by providing the name of the operator, followed by two integer operands.
/add/Int/Int
So to Add two numbers 5 and 10, you would go to
/add/5/10
and this will return 15
You can use the same idea with subtract, multiply and divide:
/subtract/Int/Int
/multiply/Int/Int
/divide/Int/Int
Every time you carry out an operation, it gets saved to a database. To see your calculations for a specific operator, don't put the two integers after the operator, eg /add, this will display a table of all the additions that have been carried out.
/add
/subtract
/multiply
/divide
Incidentally, if you wish to view every calculation for all the operators, you can, simply go to /calculations and it will display all the calculations, neat!
The API allows requests for both HTML and JSON, by default it will return HTML. In order to receive JSON instead add ?_accept=application/json to the URL.
For instance if you wish to have your addition in JSON, you would go to:
/add/5/10?_accept=application/json
And voila, JSON is returned!
This works for every calculation, as well as the list of operations that can be returned from /calculations or /add etc, and it will return a list of perfect JSON objects.