The Ruby Infinite Hash

December 13, 2010 code 1 min read

@tenderlove shows us ruby magic to create an infinite hash:

>> hash = Hash.new { |h, k| h[k] = Hash.new(&h.default_proc) }
 => {}
>> hash['a'] = 1
 => 1
>> hash['a']
 => 1
>> hash['b']
 => {}
>> hash['b']['c']['d']
 => {}

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