igaiga/hash_example.rb

Created July 18, 2017 09:44

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hash_example.rb

	h = {}
	["a", "a", "b"].each do \|x\|
	h[x] = [] unless h[x]
	h[x] << x
	end
	p h
	#=> {"a"=>["a", "a"], "b"=>["b"]}

nobu commented Jul 23, 2017

default_proc で代入すると意図していないところでも勝手に追加されるので、追加するところで代入するとか

h["a"] <<= "a"

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