Thanks, all.
Earlier, I was going to ask how to break out of a sequence op prematurely, i.e., you give it some replication number but want to break early if you get an end-flag value. While I was composing the post I thought of using Maybe for the good values and Nothing for the end value. Ergo, losing the Nothings at the end.
I was passing a map and an empty list into some state, but since the map doesn't change once it's created I moved it into a Reader. I was using the list to collect the elements but thought I can get that functionality automatically using sequence.
So, one thing leads to another. It's interesting how ideas begin bubbling up after one absorbs some critical mass of Haskell.
Michael
--- On Mon, 5/23/11, Malcolm Wallace
What's the best way to end up with a list composed of only the Just values, no Nothings?
Alternatively, [ x | Just x <- originals ] It also occurs to me that perhaps you still want the Just constructors. [ Just x | Just x <- originals ] [ x | x@(Just _) <- originals ] _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe