Which way of these two pattern matching is more preferred?
functional-programming, ocaml, pattern-matching, performance, preference
Solution
Performance wise there is no difference. Style-wise `b -> a` is a bit problematic because you have an unused variable `b`. `_ -> a` would make more sense. Other than that, it's just preference.
Personally I would prefer `_ -> a` over `b -> b` because it doesn't introduce an extra variable.
PS: I assume in your real code there are more cases than just `b` - otherwise you could just write `let f a = a`.
Problem
I'm just curious, these two functions would do the same thing. But which one should I use? ``` let f a = match a with b -> a;; let f a = match a with b -> b;; ``` Or it just depends on your preference? I feel the second one would be better but I'm not sure.