delete_at(p1) public

Deletes the element at the specified index, returning that element, or nil if the index is out of range. See also Array#slice!. 

   a = %w( ant bat cat dog )
   a.delete_at(2)    #=> "cat"
   a                 #=> ["ant", "bat", "dog"]
   a.delete_at(99)   #=> nil
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