# I've been reading a book on symmetry lately(http://is.gd/MGST), 
# and the other day it touched on something interesting that it 
# turns out my code could have benefited from very recently: 
# Modular Arithmetic

# The use case was cycling through indexes of an array. 
# I had an operation that I wanted cycle through an array of values 
# for use each time it was run.

# Instead of something like this...
def rotate_index
  new_value = index + 1
  new_value = 0 if new_value >= array.size
  set_index(new_value)
end

# You could say this...
def rotate_index
  set_index((index + 1) % array.size)
end

# Math strikes again!