In the functional language Haskell, there is a clear disadvantage of appending
an item onto the end of a list, and developers are strongly encouraged to build
lists by prepending an item onto a list.
It would be interesting to know the basis for this advice.
(a) Does the Haskell language mandate an implementation?
(b) or is there only one implementation?
(c) or is there so much commonality between implementations that such
advice applies to all of them?
(d) or is the book written for users of a particular implementation?
XSLT is more like SQL in this regard - different optimizers do things
differently.
Michael Kay
Saxonica
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