> something like this:
> h['b'].delete
> h >> { 'a' => 'aaa', 'c' => 'ccc' }

C:\Documents and Settings\flifson>irb
irb(main):001:0> h={'a'=>'aaa','b'=>'bbb'}
=> {"a"=>"aaa", "b"=>"bbb"}
irb(main):002:0> h.delete('b')
=> "bbb"
irb(main):003:0> h
=> {"a"=>"aaa"}
irb(main):004:0>