I turn it into a for/fold or figure how to put the cases I don't want in the list as #:when for clauses. I think this is a lame solution. I almost want a C-like "continue" function. Returning an option type seems like overkill.
Jay 2011/4/15 harsha reddy <[email protected]>: > When using the various versions of for like for/list; I often encounter > situations where the body must not add any value to put into the generated > list (useful when one needs to filter and map simultaneously) or must > generate more than value. I guess the way to do this would be to treat the > result of the body as a list of additions and then concatenate all these > lists. Something similar would be needed for for for/hash(taking care of the > multiple values issue),for/and, for/vector etc. > I just wanted to know, because this seems like a common enough situation, > if there are some standard commands or libraries which implement the > modified versions of these commands. > thanks, > Harsha > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users > -- Jay McCarthy <[email protected]> Assistant Professor / Brigham Young University http://faculty.cs.byu.edu/~jay "The glory of God is Intelligence" - D&C 93 _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
