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igaiga/hash_default_proc.rb

Created April 6, 2018 02:21
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hash_default_proc.rb
h1 = {}
h1.default= []
h1[:a] = h1[:a] << "hi"
h1[:b] = h1[:b] << "ho"
p h1 #=> {:a=>["hi", "ho"], :b=>["hi", "ho"]}
h2 = {}
h2.default_proc = ->(hash, key){ [] }
h2[:a] = h2[:a] << "hi"
h2[:b] = h2[:b] << "ho"
p h2 #=> {:a=>["hi"], :b=>["ho"]}
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