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flaneur2020/gist:9183545

Last active August 29, 2015 13:56
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gistfile1.txt
2.0.0-p247 :001 > h = Hash.new([])
=> {}
2.0.0-p247 :002 > h[:a] << 1
=> [1]
2.0.0-p247 :003 > h
=> {}
2.0.0-p247 :004 > h[:a]
=> [1]
2.0.0-p247 :005 > h
=> {}
2.0.0-p247 :006 > h[:a] += [2]
=> [1, 2]
2.0.0-p247 :007 > h
=> {:a=>[1, 2]}
2.0.0-p247 :008 > h[:b]
=> [1]
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