Is it the same order in which the items were added to the Hash ?
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问题:
回答1:
The top of the Ruby 1.9.2 documentation for the Hash class declares:
Hashes enumerate their values in the order that the corresponding keys were inserted.
Cursory tests suggest that this does indeed apply to both Hash#keys and Hash#values, although the corresponding documentation for those methods doesn't seem to specify it.
回答2:
In Ruby 1.8, there's no guaranteed order for the elements in a hash.
