[erlang-questions] Sets from list then to list?

Per Gustafsson <>
Mon Apr 7 12:36:19 CEST 2008

Alexander Lamb wrote:
> Well, spoke to fast. usort/1 works fine, but when I provide my own  
> function, it doesn't remove the duplicates.
> It looks like this is because my sort function can only return true or  
> false. What should it return to usort/2 removes correctly duplicates.
> Thanks,
> Alex

It seems (from the source code) that it should be a function F which 
returns true for both F(X,Y) and F(Y,X) if X is equal to Y.


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