We can find the difference between two arrays using the Enumerable#reject
method. This method rebuilds an array based on conditions that are evaluated
in a block. In the block we simply reject any element of the array that is in
the comparison array.
{{code:php $animals1 = array('cat', 'dog', 'bat', 'rat'); $animals2 = array('cat', 'dog');
$result = array_diff($animals1, $animals2);
var_export($result);
// => array(2 => 'bat', 3 => 'rat')
}}
{{code:ruby animals1 = ['cat', 'dog', 'bat', 'rat'] animals2 = ['cat', 'dog']
p animals1.reject {|a| animals2.include?(a) }
# => ["bat", "rat"]
}}
{{related:
array/array_diff_assoc
array/array_intersect
array/array_intersect_assoc
}}