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@val.to_s
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self.to_s[idx].to_i
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Use lambda in Ruby ¾ÅͲһÌõ

http://www.robertsosinski.com/2008/12/21/understanding-ruby-blocks-procs-and-lambdas/
Understanding Ruby Blocks, Procs and Lambdas
Blocks, Procs and lambdas (referred to as closures
in Computer Science) are one of the most powerful aspects of Ruby, and
also one of the most misunderstood. This ......
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