1. Why Methods?




I did not understand what "i" is doing here. Is it executing for each "i"?

e.g. n=9 so is for each i between 2 and (9-1)=8 "n%i==0" executing or not? I mean for n=9, i= 2,3,4,5,6,7,8 respectively. For my understanding of modulo n%i==0 is_prime should be true. I would be very glad if you can help me.

def prime(n)
  puts "That's not an integer." unless n.is_a? Integer
  is_prime = true
  for i in 2..n-1
    if n % i == 0
      is_prime = false


i is the individual sample taken from the range 2..n-1.


Thank you! I understood finally :slight_smile:


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