[Haskell-cafe] Lists of Lists

Robert Dockins robdockins at fastmail.fm
Wed Mar 8 15:27:14 EST 2006

On Mar 8, 2006, at 2:27 PM, zell_ffhut wrote:
> Could you explain what the function does.. I can't seem to peice it  
> together.

It takes three things 1) a function 2) an index and 3) a list.  It  
finds the nth element of the list, applies the function to it and  
then returns a new list containing the new element in the same  
position.  It dies with an error message if you index past the end of  
the list.


updateList (\x -> x + 10) 3 [0,1,2,3,4,5] == [0,1,2,13,4,5]

Rob Dockins

Speak softly and drive a Sherman tank.
Laugh hard; it's a long way to the bank.
           -- TMBG

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