thoughts.txt

NOTES
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Front end considerations
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Bootstrap 4.0 for layout - I used this to make the solution responsive

For AJAX requests - used axios because of the use of promises, better error response handling and the transformation of JSON. Could use standard fetch and call .json()

I used standard React without Redux for this solution.  Redux would certainly make it easier to handle data - all components would "subscribe" to the data they require.

The game component is the glue that ties this solution together - with Redux, there would be less reliance on Game.

The common library stumped me - I set up the create-react-app initially to get the basics done and working.  I couldn't see how to reference the common library from within the app, apart from manually coopying the generate file.


API considerations
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In API, I changed the return object of the controller from Exercise object to IActionResult.  This would enable me to send a different model and in case of failure , HttpStatus codes to be sent, separating out concerns of data.

Interfaces were used externsively to aid unit testing. I used Moq to compliment Unit testing and mock objects - alternatives = NSubstitute, FakeItEasy

For persistance, I chose to use EF Core and Sqlite, it's light and all contained within VS and within the solution folder, no database connectionstrings etc required.  
Alternatives would be other SQL variants, Compact, Sql Server or mySql.  

I implemented UnitOfWork in the API, I like this pattern to give seperation from persistance.


ASSUMPTIONS
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When the user gets an incorrect question - the game is reset.
I used guid datatype for userId - easier to generate userId's and less likely of duplicates.
As another feature to the system - I added difficulty, so that I could manually run through and test end to end.  This could be automated with Selenium or Cypress.io