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shinkbr/gist:08e9e3cc32f9c275c34e

Created May 14, 2015 10:16
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gistfile1.rb
#!/usr/bin/env ruby
# coding: utf-8
h1 = Hash.new(0)
h1[:a] += 1
p h1 #=> {:a=>1}
h2 = Hash.new({a: 0})
h2[:a][:a] += 1
p h2 #=> {}
p h2[:a] #=> {:a=>1}
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