Question

Possible Duplicate:
Remove from the array elements that are repeated. in Ruby

I would like to do this:

my_array = [1, 1, 2, 2, 3]
my_array_without_duplicates = [3]

calling my_array.uniq will give me [1, 2, 3], which is not the result I want. Is there an efficient way of doing this? What I am doing right now is too ugly to post.

Answer 1

my_array.group_by{|e| e}.select{|k,v| v.count == 1}.keys

or

my_array.select{|e| my_array.count(e) == 1}

BTW, you probably meant my_array = [1, 1, 2, 2, 3] (with brackets, not braces).