irb(main):016:0> @command = begin irb(main):017:1* Hash.new{|h, k| h[k] = Array.new} irb(main):018:1> end => {} irb(main):019:0> @command[:a] => [] irb(main):020:0> @command => {:a=>[]} irb(main):021:0> @com = Hash.new => {} irb(main):022:0> @com[:a] => nil irb(main):023:0> @com => {} irb(main):024:0>
create ruby hash using block
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转载自j4s0nh4ck.iteye.com/blog/2230910
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