ruby字符串来哈希转换 [英] ruby string to hash conversion

问题描述

我有这样的字符串，

str = "uu@p, xx@m, yy@n, zz@m"

我想知道如何将给定的字符串转换为散列。 （即我的实际要求是，有多少个值（在@符号之前）有m，n和p，我不想计数，我需要一个确切的值）。输出结果会更好，

I want to know how to convert the given string into a hash. (i.e my actual requirement is, how many values (before the @ symbol) have the m, n and p. I don't want the counting, I need an exact value). The output would be better like this,

{"m" => ["xx", "zz"], "n" => ["yy"], "p" => ["uu"]}

推荐答案

IRB会话的直接复制/过去：

Direct copy/past of an IRB session:

>> str.split(/, /).inject(Hash.new{|h,k|h[k]=[]}) do |h, s|
..   v,k = s.split(/@/)
..   h[k] << v
..   h
..   end
=> {"p"=>["uu"], "m"=>["xx", "zz"], "n"=>["yy"]}

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