On Fri, 27 Mar 2009, Jason Dusek wrote:
2009/03/27 John Lato <jwl...@gmail.com>:
I could follow the rest of this, but I don't understand why
'head' is necessary. Couldn't you always replace it with a
case statement, with undefined on [] if necessary?
How would that be any different from head?
The psychological advantage is, that you had to do something with the case
[] and programmers hopefully hesitate more to write 'error' than to write
'head'. :-) Practically, if you have no better idea than writing 'error',
you would write an error message that is more specific than "head: empty
list", which makes debugging easier._______________________________________________
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