Why does Rubymonkey makes this true

ruby-talk
1

hello,

I have this :

def kaprekar?(k)

  string_k = (k * k).to_s

  length_k = k.to_s.length.to_i

  length_k2 = string_k.to_s.length.to_i

  number1 = string_k[0...length_k].to_i

  number2 = string_k[length_k..length_k2].to_i

  number1 + number2 == k

end

and according to this error message  for 297 it output is true.

returns true for 297
RSpec::Expectations::ExpectationNotMetError
expected false to be true
But when I do the same on repl.it I see this output :

kaprekar?(297)

string_k : 88209

      length_k : 3

      length2 : 5

      number1 : 882

      number2: 9

    => false

which is the right answer.

      Can anyone explain why Rubymonk say the outcome is true.

Roelof