在Ruby中计算哈希值
发布时间：2020-12-16 19:40:33 所属栏目：百科 来源：网络整理
导读：我在 Ruby中有一个散列数组,如下所示： domains = [ { "country" = "Germany"},{"country" = "United Kingdom"},{"country" = "Hungary"},{"country" = "United States"},{"country" = "France"},{"country" = "Germany"},{"country" = "Slovakia"},{"countr
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我在
Ruby中有一个散列数组,如下所示：
domains = [
{ "country" => "Germany"},{"country" => "United Kingdom"},{"country" => "Hungary"},{"country" => "United States"},{"country" => "France"},{"country" => "Germany"},{"country" => "Slovakia"},{"country" => "Norway"},{"country" => "Norway"}
]
从这个散列数组我想创建一个新的哈希看起来像这样： counted = {
"Germany" => "3","United Kingdom" => "United Kingdom","Hungary" => "3","United States" => "4","France" => "1"
}
有没有一个简单的方法来做这个使用Ruby 1.9？ 解决方法
这个怎么样？
counted = Hash.new(0)
domains.each { |h| counted[h["country"]] += 1 }
counted = Hash[counted.map {|k,v| [k,v.to_s] }]
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