array_diff

  • 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.

    PHP

    $animals1 = array('cat', 'dog', 'bat', 'rat');
$animals2 = array('cat', 'dog');
 
$result = array_diff($animals1, $animals2);
var_export($result);
// => array(2 => 'bat', 3 => 'rat')

    Ruby

    animals1 = ['cat', 'dog', 'bat', 'rat']
animals2 = ['cat', 'dog']
 
p animals1.reject {|a| animals2.include?(a) }
# => ["bat", "rat"]

    see also

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