Question

Following code return error “Can’t convert String onto integer”, please help

subject = ['eng','Math','Sci']
grade = ['grade 1','grade 2','grade 3']
subject.each do |sub|
    puts ("some string")
    grade[sub] .each do |grd|
        puts ("some string")
    end
end

Answer 1

When you do

  grade[sub] .each do |grd|

Ruby expects sub to be using an integer to reference a position in the list of grades.