SQL Server - where is “sys.functions”?

Question

SQL Server 2005 has great sys.XXX views on the system catalog which I use frequently.

What stumbles me is this: why is there a sys.procedures

Answer 1

To extend upon @LukeH's answer, to return the function definitions as well requires a join to the sys.sql_modules table. So the query for this is:

SELECT O.name as 'Function name', M.definition as 'Definition', O.object_id
FROM sys.objects as O INNER JOIN sys.sql_modules as M
    ON O.object_id = M.object_id
WHERE type IN ('FN', 'IF', 'TF')  -- scalar, inline table-valued, table-valued

where the above displays the function name, its definition and the object identifier respectively.