How do you append a char to a string in OCaml?

Question

It seems as if there is no function in the standard library of type char -> string -> string, which insert a char in front of (or at the end of)

Answer 1

String.make and String.blit is a good way to do so, but they seem to be imperative. Personally I prefer to make infix functions using Char.escaped and string concatenation:

let (^$) c s = s ^ Char.escaped c (* append *)
let ($^) c s = Char.escaped c ^ s (* prepend *)