[英]How to sort a mixed array by different elements in Ruby?
我有一个类似于这样的数组:
a = [
[0, {:a=>"31", :b=>"21"}],
[1, {:a=>"32", :b=>"11"}],
[1, {:a=>"25", :b=>"19"}],
[0, {:a=>"12", :b=>"10"}]
]
我希望按每行的第一个元素或散列的各个元素(行中的第二个元素)对其进行排序。
按数组中的第一项排序:
> a.sort_by{|x| x.first}
=> [[0, {:a=>"31", :b=>"21"}],
[0, {:a=>"12", :b=>"10"}],
[1, {:a=>"32", :b=>"11"}],
[1, {:a=>"25", :b=>"19"}]]
按哈希中的第一项排序:
> a.sort_by{|x| x.last.first}
=> [[0, {:a=>"12", :b=>"10"}],
[1, {:a=>"25", :b=>"19"}],
[0, {:a=>"31", :b=>"21"}],
[1, {:a=>"32", :b=>"11"}]]
或者您可以按散列的给定键进行排序:
> sort_key = :b
> a.sort_by{|x| x.last[ sort_key ]}
=> [[0, {:a=>"12", :b=>"10"}],
[1, {:a=>"32", :b=>"11"}],
[1, {:a=>"25", :b=>"19"}],
[0, {:a=>"31", :b=>"21"}]]
如果要按第一个数组值排序,然后按哈希中的第一个条目排序,作为辅助搜索条件,答案是:
> a.sort_by{|x| [x.first, x.last.first]}
=> [[0, {:a=>"12", :b=>"10"}],
[0, {:a=>"31", :b=>"21"}],
[1, {:a=>"25", :b=>"19"}],
[1, {:a=>"32", :b=>"11"}]]
a = [
[0, {:a=>"31", :b=>"21"}],
[1, {:a=>"32", :b=>"11"}],
[1, {:a=>"25", :b=>"19"}],
[0, {:a=>"12", :b=>"10"}]
]
p a.sort_by{|el| [el.first, *el.last.values]}
输出:
=> [[0, {:a=>"12", :b=>"10"}],
[0, {:a=>"31", :b=>"21"}],
[1, {:a=>"25", :b=>"19"}],
[1, {:a=>"32", :b=>"11"}]]
好吧,我找到了自己问题的答案。 请比较和评论。
#sort by first item of each row (number)
a.sort{|x,y| x[0] <=> y[0]}
#sort by the first item in the hash
a.sort{|x,y| x[1][:a] <=> y[1][:a]}
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