basic-fp-fizzbuzz.js

const fizzbuzz = number => {
  const isFizz = number => number % 5 === 0;
  const isBuzz = number => number % 3 === 0;
  
  const genIterable = number => [...Array(number).keys()].map(i => i + 1);
  const verification = number => {
    if (isFizz(number) && isBuzz(number)) return 'fizzbuzz';
    if (isFizz(number)) return 'fizz';
    if (isBuzz(number)) return 'buzz';
    return number
  };

  return genIterable(number)
    .map(verification)
    .join('\n');
};