The author introduces Hindley-Milner type inference, explaining the motivation behind using it in software development. They explore the tradeoff between expressiveness and legibility in programming languages, using examples to illustrate how HM systems work and their limitations. The author delves into the hierarchy of types, defining monotypes and polytypes, and the importance of type inference in eliminating runtime errors. They discuss examples of how HM systems affect coding practices and language design, highlighting HM’s benefits in type inference and error prevention, while also pointing out instances where certain programming tasks are restricted or challenging within an HM framework.
https://reasonableapproximation.net/2019/05/05/hindley-milner.html