Class check in Swift

ClassCheck.swift

class foo {
    let className = "foo"
}

let a = foo()

func isFoo(_ instance: Any) -> Bool {
    return instance is foo
}

func check(_ instance: Any) {
    if isFoo(instance) {
        print("it is foo")
    } else {
        print("it is somenthing else")
    }
}

check(a)