The reducer is a case where the functional programming concepts like sum types make a dramatic difference, but they are widely useful across your codebase. It

The reducer is a case where the functional programming concepts like sum types make a dramatic difference, but they are widely useful across your codebase. It shouldn't be a surprise that React works well in ReasonML - the first prototype of ReactJS was written in StandardML before the creator ported it to JS (https://reasonml.github.io/docs/en/what-and-why.html https://reasonml.github.io/docs/en/what-and-why.html)