Remove duplicate elements

Given an Array, derive an Array containing only the unique elements; that is, derive an array in which all duplicate elements are removed.

C++

C++ with STL using Microsoft Visual C++ 2005

 using namespace std;
 int data[] = {1, 2, 3, 2, 3, 4};
 vector<int> ary(data, data + 6);
 sort(ary.begin(), ary.end());
 ary.erase(unique(ary.begin(), ary.end()), ary.end());

Java

 //Using Java 1.5/5.0
 Object[] data = new Object[] {1, 2, 3, "a", "b", "c", 2, 3, 4, "b", "c", "d"};
 Set uniqueSet = new HashSet(Arrays.asList(data));
 Object[] unique = uniqueSet.toArray();

Perl

Interpeter: Perl

my %hash;
my @list = (1, 2, 3, 'a', 'b', 'c', 2, 3, 4, 'b', 'c', 'd');
@hash{@list} = 1;
# the keys of %hash now contain the unique list
my @unique_list = keys(%hash);

Python

 data = [1, 2, 3, 'a', 'b', 'c', 2, 3, 4, 'b', 'c', 'd']

Using sets

 unique = list(set(data))

Ruby

 ary = [1,1,2,1,'redundant',[1,2,3],[1,2,3],'redundant']
 uniq_ary = ary.uniq
 # => [1, 2, "redundant", [1, 2, 3]]