Remove duplicate elements
Remove duplicate elements
You are encouraged to solve this task according to the task description, using any language you may know.
You are encouraged to solve this task according to the task description, using any language you may know.
Given a Array, create a derived Array containing only the unique elements
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))
See also http://www.peterbe.com/plog/uniqifiers-benchmark and http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52560
Ruby
ary = [1,1,2,1,'redundant',[1,2,3],[1,2,3],'redundant'] uniq_ary = ary.uniq # => [1, 2, "redundant", [1, 2, 3]]