David Fox reacts to my criticism of his attitude towards the meaning of
folds:
I'm not trying to avoid learning the differences between the different
folds, but I am looking for a mnemonic device that will allow me to
proceed more quickly towards my goal. My ultimate goal is to write
software,
On Tue, Nov 22, 2011 at 5:04 AM, Jerzy Karczmarczuk
jerzy.karczmarc...@unicaen.fr wrote:
David Fox reacts to my criticism of his attitude towards the meaning of
folds:
I'm not trying to avoid learning the differences between the different
folds, but I am looking for a mnemonic device that
On Tue, Nov 22, 2011 at 09:10, David Fox dds...@gmail.com wrote:
I think the other replies in this thread speak for themselves - i
found them very helpful.
That would be because they mostly back-doored around your stated intent.
--
brandon s allbery
I would say a good practice with folds (and maybe in Haskell in general) is
that either all be strict or all be lazy.
In the expression: foldXX f init list:
Remember that foldr does:
x `f` ( ... the accumulator ... )
and foldl:
(... the accumulator ...) `f` x
The accumulator has to match a
Yves Parès:
if *f* is lazy in its second argument, then use foldr. Everything is
lazy, you build a very small thunk since nothing is evaluated.
In the rare cases where*f *is (also) lazy in its first argument, you
can use foldl.
...
I have the impression that this is not the most useful advice
On Mon, Nov 21, 2011 at 4:44 AM, Jerzy Karczmarczuk
jerzy.karczmarc...@unicaen.fr wrote:
In general, sorry for the cynism, but when I read:
There are times when I would like to find out which to use in the quickest
way possible, rather than reading a long explanation of why each one behaves
Does anyone have a quick way to decide which of the fold functions to
use in a given situation? There are times when I would like to find
out which to use in the quickest way possible, rather than reading a
long explanation of why each one behaves the way it does.
On Sunday 20 November 2011, 17:28:43, David Fox wrote:
Does anyone have a quick way to decide which of the fold functions to
use in a given situation? There are times when I would like to find
out which to use in the quickest way possible, rather than reading a
long explanation of why each
On 11/20/11 11:58 AM, Daniel Fischer wrote:
On Sunday 20 November 2011, 17:28:43, David Fox wrote:
Does anyone have a quick way to decide which of the fold functions to
use in a given situation? There are times when I would like to find
out which to use in the quickest way possible, rather
