At Tue, 6 Jan 2015 19:05:24 -0500, Benjamin Greenman wrote: > > > > From a practical point of view, at the low level the implementation is > > heavily optimized for functions that return exactly one value. > > Functions that return a different number of values are slower. > > > > Does this mean I'm better off returning (cons a b) than (values a b)?
Probably not. In increasing order of cost: * return a single value * return multiple values * allocate a compound data structure (such as a pair) The gap between the last two tends to be much bigger than the gap between the first two. Then again, if you create a pair and return it through multiple bindings and returns (i.e., one allocation and many single-value returns), it can be faster than multiple values through multiple bindings and returns (i.e., many multiple-value returns). ____________________ Racket Users list: http://lists.racket-lang.org/users
