ghci will (usually) tell you:<p><pre><code>    phil@arod:~$ ghci
    GHCi, version 7.6.3: http:&#x2F;&#x2F;www.haskell.org&#x2F;ghc&#x2F;  :? for help
    Loading package ghc-prim ... linking ... done.
    Loading package integer-gmp ... linking ... done.
    Loading package base ... linking ... done.
    Prelude&gt; :t take 5 . filter (\ _ -&gt; True) . drop 3
    take 5 . filter (\ _ -&gt; True) . drop 3 :: [a] -&gt; [a]
</code></pre>
So it’s a function from List of a to List of a