It seems that the looping constructs don't currently return a value.  In other words, they don't return an array of the results.  CoffeeScript allows for both scenarios, that is, looping for side-effects and looping that returns an array of results.  I'm thinking it would be very useful to have dotimes*, dolist*, for-in*, etc. that return an array of results.  Below is an example from coffeescript.org.  Let me know what you think.

David

countdown = (num for num in [10..1])