HaskellA purely functional language with lazy evaluation — influential in type systems and compiler research. treats programs as expressions rather than step-by-step mutations — popular in academia, quantitative finance, and as a testbed for language ideas that later appeared in RustA systems language emphasizing memory safety without garbage collection — fast adoption in infrastructure., Scala, and SwiftApple's language for iOS, macOS, and server apps — designed for safety and performance.. Its main compiler, GHCGlasgow Haskell Compiler — the main compiler and runtime for the Haskell programming language., became the reference for research and production HaskellA purely functional language with lazy evaluation — influential in type systems and compiler research..

HaskellA purely functional language with lazy evaluation — influential in type systems and compiler research. unified many competing research languages into one teachable, widely studied design.

It popularized powerful type and abstraction ideas that later spread into mainstream languages.