We can find the unique elements of an array in Ruby using Array#uniq.
{{code:php $fruit = array('apple', 'kiwi', 'apple', 'apple', 'lime'); $result = array_unique($fruit); var_export($result); // = array(0 => 'apple', 1 => 'kiwi', 4 => 'lime') }}
{{code:ruby fruit = ["apple", "kiwi", "apple", "apple", "lime"] p fruit.uniq # => ["apple", "kiwi", "lime"] }}
One thing to note is that while PHP does not factor data type in to the
uniqueness of the elements, Ruby does. A Fixnum 1 is different than a String
"1" in Ruby.
{{code:php $input = array(1, 2, '1', '2'); $result = array_unique($input); var_export($result); // => array(0 => 1, 1 => 2) }}
{{code:ruby input = [1, 2, "1", "2"] p input.uniq # => [1, 2, "1", "2"] }}
We can emulate the PHP behavior by converting the data in the array to a
common type before using the uniq method.
{{code:ruby input = [1, 2, "1", "2"] p input.collect {|val| val.to_s }.uniq # => ["1", "2"] }}