How to: multiple-digit integer, extract each integer into an array of single integers

Question

I'm undertaking an exercise that hinges on being able to do this task. I have to take a multiple digit integer >=0, i.e. 830124, and make an array of the individual digits.

My line of thinking is that I can convert it to a string, index the string in an array, then convert back to ints, but i'm still a little lost. Any suggestions?

Answer 1

n = 830124

n.to_s.split('').map(&:to_i)
  #=> [8, 3, 0, 1, 2, 4]

or, without converting characters to integers:

n.to_s.size.times.with_object([]) { |_,a| n,i = n.divmod(10); a.unshift(i) }
  #=> [8, 3, 0, 1, 2, 4]