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Comment by snorkel | Hacker News Reader

Empty string is true. Who here hasn't banged their head over that one?

It's probably better to think "everything that isn't nil or false is true".

0 is true too. I think that's actually brilliant.

    [1,2,3].index(1)
    # => 0
    [1,2,3].index(4)
    # => nil