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> The only real requirement of functional programming is the support of first class functions, the possibility to pass and return functions like any other value

• scns 5y ago
  It does. I enjoyed the book Functional C by Hartel & Muller a lot: https://www.semanticscholar.org/paper/Functional-C-Hartel-Muller/31acb7abaf3a1962b27be9faa2322038d1ac9ed7 https://www.semanticscholar.org/paper/Functional-C-Hartel-Mu... It uses SML, had fun learning this stuff on the train with termux and vim.
• fstrthnscnd 5y ago
  Actually, first class functions also means the ability to form functions (ie, closures). Javascript for instance has that feature. I think that python also supports it. C OTOH doesn't, but it has other advantages.
  • pjmlp 5y ago
    Basic implementation for car, cdr, map with function pointers and clang blocks, the rest of Lispy stuff is left as an exercise. :) https://godbolt.org/z/Y5qWs4c64 https://godbolt.org/z/Y5qWs4c64
    • fstrthnscnd 5y ago
      That's cool! C++ had support for partial applications with templates (std::bind iirc), and it was possible to implement closures as objects with the () operator implemented. Now it has support for closure with a dedicated syntax. It would be possible to do something similar in C - a closure is just a function pointer and a bunch of parameters bundled together, but I don't think there's enough flexibility in the language to make it look like regular function calls.