Ruby：Hash 排序

people = {:fred => 23,:joan => 18,:pete => 54
}

年龄排序：

people.values.sort    # => [18, 23, 54]

姓名排序：

people.sort_by { |name, age| age }# => [[:joan, 18], [:fred, 23], [:pete, 54]]

或者

people.sort

一个复杂点的hash

people = {:fred => { :name => "Fred", :age => 23 },:joan => { :name => "Joan", :age => 18 },:pete => { :name => "Pete", :age => 54 }
}

people.sort_by { |k, v| v[:age] }# => [[:joan, {:name=>"Joan", :age=>18}], [:fred, {:name=>"Fred", :age=>23}],[:pete, {:name=>"Pete", :age=>54}]]

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