Modular arithmetic Memes

Left side: You meticulously calculating digital roots by converting to string, looping through digits, summing them up, and recursing until you get a single digit. Right side: That one-liner wizard who knows that n%9 or n and 9 does the exact same thing because of mathematical properties nobody remembers from school. Your code works. Their code works faster and makes you question your entire career. Just another Tuesday in programming.