From: Marc Heiler <shevegen@...>
Date: 2009-06-06T10:03:30+09:00
Subject: Can someone explain the difference: Array[] and Array.fetch

array = ["a","b","c"]        # => ["a", "b", "c"]
array[1]                     # => "b"
array.fetch 1                # => "b"


# ================================================== #
# So far, so fine.
# ================================================== #


array[666]                   # => nil
array.fetch 666

IndexError: index 666 out of array
        from (irb):5:in `fetch'
        from (irb):5


This may seem like a trival difference between the two, but
I am wondering in general why they behave differently.
Or in other words, why array[] does not return an error
whereas .fetch specifically does.
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