[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: XSLT repetition constructs
> > I have to confess I always find it difficult to come up with a convincing > > use case for fold-right(). > > Symmetricality and karma? I haven't been engaged with this for some time, but from what I remember, foldl() is executed eagerly and can lead to call-stack overflow, while foldr() allows lazy evaluation and thus doesn't lead to stack overflow. This is why in FP (Haskell) using foldr() is generally preferred to using foldl() Also, if the chain of execution leads to result that would allow short-cutting -- as in getting a 0 when computing the product of a list of numbers, foldl() will still continue to do the multiplications until the whole list is processed, while foldr() produces the result immediately. Must dig for some specific material that discusses this at length. Cheers, Dimitre On Thu, Mar 7, 2019 at 5:23 AM Peter Flynn peter@xxxxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > > On 7 March 2019 11:56:10 "Michael Kay mike@xxxxxxxxxxxx" > <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > > > I have to confess I always find it difficult to come up with a convincing > > use case for fold-right(). > > Symmetricality and karma? > > P > > -- Cheers, Dimitre Novatchev --------------------------------------- Truly great madness cannot be achieved without significant intelligence. --------------------------------------- To invent, you need a good imagination and a pile of junk ------------------------------------- Never fight an inanimate object ------------------------------------- To avoid situations in which you might make mistakes may be the biggest mistake of all ------------------------------------ Quality means doing it right when no one is looking. ------------------------------------- You've achieved success in your field when you don't know whether what you're doing is work or play ------------------------------------- To achieve the impossible dream, try going to sleep. ------------------------------------- Facts do not cease to exist because they are ignored. ------------------------------------- Typing monkeys will write all Shakespeare's works in 200yrs.Will they write all patents, too? :) ------------------------------------- Sanity is madness put to good use. ------------------------------------- I finally figured out the only reason to be alive is to enjoy it.
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