How is set! defined in scheme?

Question

How would you implement your own set! function in Scheme? A set! function is a destructive procedure that changes a value that is defined taking into account th

Answer 1

Can't, can't, can't. Everyone is so negative! You can definitely do this in Racket. All you need to do is to define your own "lambda" macro, that introduces mutable cells in place of all arguments, and introduces identifier macros for all of those arguments, so that when they're used as regular varrefs they work correctly. And a set! macro that prevents the expansion of those identifier macros, so that they can be mutated.

Piece of cake!