I used to think Javascript was a great prototyping language. In fact I specifically practiced prototyping with it -- my github is littered with repo's for each

I used to think Javascript was a great prototyping language. In fact I specifically practiced prototyping with it -- my github is littered with repo's for each of my prototypes -- I call them the Laundromat Demos. I would use the 70-80 minutes I had at the laundromat to write a prototype for a game in JS. However I've tried something similar with Haskell. I think I prefer Haskell for prototyping these days. It turns out you can get a long way playing with the types. Often I spend more time prototyping the types and they guide me to the implementation which is often quite small. It takes some training and work to get there but I think Haskell, for me, is a better prototyping language -- I don't have to deal with undefined, accidental prototype overloading, etc.