From: Giampiero Zanchi <cidza@...>
Date: 2009-12-21T23:12:35+09:00
Subject: Re: Question about sum of fibonacci sequene

Not efficient but with no explicit loop (while...)

fibonacci = (1..100).inject(f = [1,1]) {|f, n| f.insert(-1,(f[-2] + 
f[-1])) }
fibonacci.delete_if {|n| n>= 4_000_000 or n.odd?}
p fibonacci.inject(0) {|s,n| s + n}

one line:
p (1..100).inject(f = [1,1]) {|f, n| f.insert(-1,(f[-2] + f[-1])) 
}.delete_if {|n| n>= 4_000_000 or n.odd?}.inject(0) {|s,n| s + n}

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