Elance Exams Answers PDF file

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What's an equivalent way of performing the following (h is a Hash): h.each { |k,v| h.delete k if k.nil? }

The original will result in a warning: multiple values for a block parameter
h.keys.compact!
h.delete_if { |k,v| k.nil? }
h.compact!
The original will raise a NoMethodError
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