This calculator app is made by me to learn Reason ML by exercising my muscle memory stick with its syntax and semantics. Most of the code that I have written is only rewritten of elm version of chrisbuttery / elm-calculator, and css is implemented using kalpeshsingh.
Go and calculate with it! Reason-Calculator
> git clone https://github.com/broerjuang/reason-fancy-calculator
> cd reason-calculator
> yarn install
> yarn start
I impress by the similarity that elm and reason have in common like typing and architecture. (both have reducer by default!) This makes the translation between elm and reason quite easy.