[racket-users] Re: Removing duplicates from a list while maintaining order

[Prabhakar Ragde]

This is a homework question of mine (though I don't think the OP is 
doing homework for a course for credit; I'd be curious to know where he 
found it). I usually state the restrictions on 'reverse' and 'remove', 
but not 'member?'. The restriction on 'reverse' is so that students 
don't write one of the functions by reversing, calling the other, 
reversing again. Also sometimes when students violate structural 
recursion, they get a reversed result, and I don't want them applying 
'reverse' as a quick fix. The restriction on 'remove' is on the built-in 
function of that name, because it only removes one element, and using it 
leads students away from structural recursion. Recently I have taken to 
hinting that they should write something like remove*. --PR

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