[Haskell-cafe] List syntax -- [] vs ()

[Crypt Master]

Hi

I have noticed that lists seem to swtich between using [] and using (). for 
example:

listSum [] = 0
listSum (x:xs) = x + listsum xs

but when specificy lists you use [] as in [1,2,3].

or type signatures are [a] -> [a]

It also seems when they mentioned on the right hand side it also always [].

Is it just for pattern matching that you use the "tuple" syntax ? How does 
haskell know we dont mean a tuple ? Or do we mean a tuple when we say (x:xs) 
?

Thanks

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