Yes, _ indicating that a parameter is not relevant is how it's used in Haskell.
Though I do feel obligated to point out that, being lazy-evaluated, even if you do give a parameter a name it still won't be evaluated until you actually use it.
Haskell is a relatively recent language; I know that Prolog (a completely different paradigm) did the same for underscores back in 1972, and I wouldn't be surprised if there is an even earlier example.
