fizzbuzz.js

function isMultipleOf(x, say) {
  return (i) => i % x == 0 ? say() : ''; 
}
const thenSay = (say) => () => say;

// The order matters. Any function with the signature (any)->(int)->str is valid
const whatShouldISayWhen = [
  isMultipleOf(3, thenSay('Fizz')),
  isMultipleOf(5, thenSay('Buzz'))
];

const until = 100;
for (let count = 1; count < until; count++) {
  let saySomething = false;
  const whatIWillSay = whatShouldISayWhen.map((is) => {
    const iSay = is(count);
    saySomething |= iSay != '';
    return iSay;
  });
  
  if (saySomething) {
    console.log(whatIWillSay.join(''));
  } else {
    console.log(count);
  }
}