fizzbuzz.js

(() => {
  const numbers = [0, 3, 5, 10, 15, 20, 25, 30];
  const FIZZ = 3;
  const FIZZ_WORD = "Fizz";
  const BUZZ = 5;
  const BUZZ_WORD = "Buzz";
  
  const checkModuleIsZero = (numerator, denominator) => {
    return numerator % denominator === 0;
  };
  
  const checkStateFizz = (num) => {
    return checkModuleIsZero(num, FIZZ);
  };
  
  const checkStateBuzz = (num) => {
    return checkModuleIsZero(num, BUZZ);
  };

  let state;
  numbers.forEach(number => {
    state = null;
    if(checkStateFizz(number)) {
      state = FIZZ_WORD;
      if(checkStateBuzz(number)) {
        state += BUZZ_WORD;
      }
    }
    
    if(!state && checkStateBuzz(number)) {
      state = BUZZ_WORD;
    }
    
    console.log({number, state});
  });
  
})();