module
Importance_2
Ruby latest stable (v1_8_7_72) - 1 note

The Enumerable mixin provides collection classes with several traversal and searching methods, and with the ability to sort. The class must provide a method each, which yields successive members of the collection. If Enumerable#max, #min, or #sort is used, the objects in the collection must also implement a meaningful <=> operator, as these methods rely on an ordering between members of the collection.

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August 23, 2008
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Some methods listed for this class need require 'enumerator'

The methods:

need that you put this require in your scripts: 

  require 'enumerator'