Generalised? Heck, I don't use list comprehension at all! :-P
Perhaps you should! :-)
You definitely should! Take a look at the Uniplate paper for some wonderful concise uses of list comprehensions for abstract syntax tree traversals. If you use a language like F# they become even more common - due to a clunkier syntax for lambdas, less library functions and no operator sections. In my F# I rarely use a map at all. But my faviourite list comprehension trick was shown to me by Colin Runciman: prettyPrint b (lhs :+: rhs) = ['('|b] ++ f lhs ++ " + " ++ f rhs ++ [')'|b] Imagine b represents whether something should be bracketed or not. In general: if boolean then [value] else [] Can be written as: [value | boolean] Thanks Neil ============================================================================== Please access the attached hyperlink for an important electronic communications disclaimer: http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html ==============================================================================