How to code a Fibonacci digit counter

In this section, we are going to solve another fun math problem that asks us to solve this problem: what is the index of the first term in the Fibonacci sequence to contain 1,000 digits?

In case your college algebra is a little rusty, the Fibonacci sequence is a series where you add the next number to the previous number in that series. These numbers can get massive quickly because the addition to the previous value creates a mathematical snowball effect.

Though the problem sounds daunting, it can be solved easily in Ruby.

We are going to start by creating a method called fibonacci_digit_counter and define some variables:

def fibonacci_digit_counter
  num1, num2, i = -1, 0, 1
end 

Next, we will create a while loop inside of the fibonacci_digit_counter method and iterate over the digit value of i:

while i.to_s.length < 1000
  num1 += 1
  i, num2 = num2, num2 + i
end 

In this code, we converted the value of i into a string and called the length method on it...