23 lines
771 B
Ruby
23 lines
771 B
Ruby
# creating an empty hash
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h = {} #=> {}
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h["a"] = 1 #=> {"a"=>1}
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h["test"] = 2.4 #=> {"a"=>1, "test"=>2.4}
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h[3] = "Hello" #=> {"a"=>1, "test"=>2.4, 3=>"Hello"}
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h = {a:1, test:2.4, World!:"Hello"}
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#=> {:a=>1, :test=>2.4, :World!=>"Hello"}
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# creating a hash with the constructor
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h = Hash.new #=> {} (default value : nil)
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p h[1] #=> nil
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h = Hash.new(0) #=> {} (default value : 0)
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p h[1] #=> 0
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p h #=> {}
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h = Hash.new{|hash, key| key.to_s}
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#=> {}
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p h[123] #=> "123"
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p h #=> {}
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h = Hash.new{|hash, key| hash[key] = "foo#{key}"}
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#=> {}
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p h[1] #=> "foo1"
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p h #=> {1=>"foo1"}
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