From: Brian Candler <b.candler@...>
Date: 2009-11-16T19:41:14+09:00
Subject: Re: Enumerable#find_yield, useful shortcut? better name?

Unless I have misunderstood, I think there is an almost identical 
facility built-in:

>> [1,2,3].find(lambda {-1}) { |x| x > 10 }
=> -1

It's slightly inconvenient to require a proc for the default, but it 
means you can create an 'expensive' object or modify the collection with 
a side-effect:

>> a = [1,2,3]
=> [1, 2, 3]
>> a.find(lambda{ a << 99; a.last }) { |x| x > 10 }
=> 99
>> a
=> [1, 2, 3, 99]
>> 
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