Scala is a OO language with FP support, clojure is a functional language with OO support, they are very different. It's normal for someone with a OO background to think that every method receives a object of some kind and it's good to know it's type in advance, and if you want polymorphism you create a subclass or implement an interface but in clojure functions are polymorphic not classes. Let's take the function first as an example, if you give a String to first you'll get the first char, if you give a vector or list you'll get the first element, if you give a java array you'll get the element at index 0. In scala each collection class has a overriden first method so you can have a static and pre-defined return type, in clojure the first function is itself polymorphic so it doesn't make sense to say that the return type of first is Object because it depends on the parameter. You can code clojure's first function in scala but the parameter and return type would be Object, and you would have to typecast it anyway. (Maybe with scala's extremely fancy type system you can create a generic first function a la clojure but the type signature would make my eyes hurt :) With doc, source (the functions) and the repl, a static typing system would'n be that useful
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