Range in ruby can be used in following situations

• as Sequence

Range can be used to generate a sequence as simple as (1..100) will generate a sequence from 1 to 100.

array = (1..100).to_a

will initialize an array of class Integer starting from 1 to 100. And it is easiest way to declare an array of sequence in ruby.

• as Intervals

if ((1..10) === 5)

puts "5 lies in (1..10)"

end

===>

5 lies in (1..10)

• as condition

  score = 70
    
  result = case score
     when 0..40 then "Fail"
     when 41..60 then "Pass"
     when 61..70 then "Pass with Merit"
     when 71..100 then "Pass with Distinction"
     else "Invalid Score"
  end
    
  puts result
  

Cheers!!!