Category talk:Iteration

I'm not sure about Loop/Map and Loop/Fold. I've never heard of them before. Can someone else fill in tasks for them? --Mwn3d 12:33, 14 April 2008 (MDT)

Loop/Map is already there, as Apply a callback to an Array (see the Common Lisp solution!) I don't know what Loop/Fold means, but maybe it's also already there under another name. --Ce 13:28, 18 April 2008 (MDT)

The articles Sum and product of array contains some examples of Fold(or reduce). Fold apply a binary function(ZxZ->Z) to each elements of a collection with an accumulator, the result value is set to the accumulator, and the final value of accumulator after iterated all elements is the result of Fold (the accumulator initialized to 1.0 in Product case, and 0.0 in Sum case). Map is similar, but with an unary function Z->Z. There is also Filter/Select(compare Select from Array) similar to Map, with an unary boolean function, but don't keep elements if result value is false. Pedantically, these Functionals are examples of apply a callback to an array in imperative sense -- badmadevil 05:58, 19 April 2008 (MDT)