ACCEPTABLE?: List Comprehensions? (original) (raw)

Paulo Levi i30817 at gmail.com
Mon Mar 16 13:48:12 PDT 2009

I dunno. The major line reduction win is in the nested fors example, but most of the fors i make with a list output are not nested. I would just like that this proposal also adapts to the simple zip or multi-map usage.

Lets see if i understand it: Simple copy: List out = [x for x : in] Simple map: List out = [x+valueToAdd for x : in] Multi-map : List out = [x+valueToAdd, x+3 for x : in] (output list.size = in.size * 2) List out = [x+valueToAdd if x % 2 == 0, x+3 if x % 2 != 0 for x : in] Zip: List out = [x+valueToAdd, y+3 for x : in, y : in2] List out = [x+valueToAdd if x % 2 == 0, y+3 if x % 2 == 0 for x : in, y : in2] Nested fors (only 1 condiction allowed): [ a + b + c, if a > 5 && c < 2, for a : intList1, for b : intList, for c : intList]

The nested for is the most bizarre and unusual example of all. I see why you put the condition after the for, but i think that is a little less readable. If you see the nested fors example you see i'm contracting myself, viz ";" and ",". I leave the field to the experts, but please make the main usecase the easiest.

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