Question

I have a string like this,

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

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"]}

Can help me anyone, please?

Answer 1

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"]}