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RE: RE: Declarative programming requires a different mindset
- From: "Michael Kay" <email@example.com>
- To: "'Costello, Roger L.'" <firstname.lastname@example.org>,<xml-dev@l...>
- Date: Thu, 25 Mar 2010 12:26:44 -0000
Note my use of the function,
f:substring-before-last(). There is no such built-in function, I created it.
Below is how I implemented it. The implementation doesn’t seem
descriptive. It seems quite recipe-like:
Get the substring before $delimiter and
then output $delimiter, and then
seems quite imperative. Do you agree?
Yes if you think of it
that way. Not if you think of it as a definition:
The "suffix" of
a string is defined as follows:
(a) Define the "tail"
of a string to be the part of a string after the first slash, or the entire
string if if contains no slash
(b) The suffix of a
string is the tail of the string if it contains no slash, or the suffix
of the tail of the string othewise.
That's a recursive
definition of the concept. It's not a recipe for
are quite capable of adopting a different evaluation strategy for your code
from the one you were thinking of. For example, many will turn the recursion
into an iteration.
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