Requirements for including Enumerable

Question

I've been trying to design my read only Array data structure and I really like the idea of providing traversing options with Enumerable class, but I cannot find requirements of it. In some examples that I've looked, the C implementation looks for #each method, but it seems to me that it can't be enough.

FYI, `Enumerable` is a module, not a class. – Frost Jan 20 '12 at 14:46 — Frost, Jan 20 '12 at 14:46

score 8 · Accepted Answer · answered Jan 20 '12 at 14:43

8

From Pickaxe p. 474 and also from the core documentation:

The class [mixing in Enumerable] must provide a method each, which yields successive members of the collection. If Enumerable#max, min, sort, or sort_by is used, the objects in the collection must also implement a meaningful <=> operator, because these methods rely on an ordering between members of a collection.

answered Jan 20 '12 at 14:43

Wayne Conrad

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The same said in ruby documentation: http://ruby-doc.org/core-1.9.3/Enumerable.html – Aliaksei Kliuchnikau Jan 20 '12 at 14:45
@Alex, Thank you. I added that link to the answer. – Wayne Conrad Jan 20 '12 at 14:47

Requirements for including Enumerable

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