How to add a dynamic variable to the key value of a hash in Ruby-CodePudding

I am looping through a list and would like to reference the loop index number in the key of a hash.

Example:

     unit_type = Hash.new      
      index = 5 
       list.each do |x| 
        unit_type[:loop_[index]] = x 
         index = index   1 
      end

The resulting key hash value should be:

             unit_type = {:loop_5 #> "test result"}

How can I pass the index number in the key title together with other text as shown above?

CodePudding user response：

i think we can use to_sym

list.each do |x|
 unit_type["loop_#{index}".to_sym] = x
 index =  1
end

CodePudding user response：

Ruby allows #{...} interpolation for symbol literals. You could also utilize with_index to inject an index right into the loop:

list = %w[a b c]

unit_type = {}
list.each.with_index(5) do |x, i|
  unit_type[:"loop_#{i}"] = x
end

unit_type
#=> {:loop_5=>"a", :loop_6=>"b", :loop_7=>"c"}

Alternatively, via to_h which creates a hash based on key-value pairs returned by the block:

list = %w[a b c]

unit_type = list.each.with_index(5).to_h { |x, i| [:"loop_#{i}", x] }
#=> {:loop_5=>"a", :loop_6=>"b", :loop_7=>"c"}