various combinators for functions
external (|>) : 'a ‑> ('a ‑> 'b) ‑> 'b = "%revapply"
val const : 'a ‑> _ ‑> 'a
produces a function that just returns its first argument
external ignore : _ ‑> unit = "%ignore"
ignore is the same as Pervasives.ignore. It is useful to have here so that code
that rebinds ignore can still refer to Fn.ignore.
val non : ('a ‑> bool) ‑> 'a ‑> bool
val forever : (unit ‑> unit) ‑> exn
forever f runs f () until it throws an exception and returns the
exception. This function is useful for read_line loops, etc.
val apply_n_times : n:int ‑> ('a ‑> 'a) ‑> 'a ‑> 'a
apply_n_times ~n f x is the n-fold application of f to x.
external id : 'a ‑> 'a = "%identity"
The identity function. Also see Sys.opaque_identity.
val compose : ('b ‑> 'c) ‑> ('a ‑> 'b) ‑> 'a ‑> 'c
val flip : ('a ‑> 'b ‑> 'c) ‑> 'b ‑> 'a ‑> 'c
reverse the order of arguments for a binary function