Question

How can I remove the duplicate from a list in Erlang?

Suppose I have a list like:

[1,1,2,3,4,5,5,6]

How can I get:

[1,2,3,4,5,6]

Answer 1

You could use sets, for example:

my_nonDuplicate_list1() ->
    List = [1,1,2,3,4,5,5,6],
    Set = sets:from_list(List),
    sets:to_list(Set).

This returns [1,2,3,4,5], no more duplicates, but most likely not sorted.

Another possibility without the usage of sets would be:

my_nonDuplicate_list2() ->
    List = [1,1,2,3,4,5,5,6],
    lists:usort(List).

In this case it returns [1,2,3,4,5], no more duplicates and sorted.