Functional take on FizzBuzz

fizz-buzz.js

const processNumber = (data, condition, message) => data + (condition ? message : '');
    
const hasNoRemainder = (number, divider) => number % divider === 0;

const rule = (value, message) => (number, data) => 
    processNumber(data, hasNoRemainder(number, value), message);

const rules = [
    rule(3, 'Fizz'),
    rule(5, 'Buzz')
];

const test = (number) =>
    rules.reduce(
        (data, testFn) => testFn(number, data),
        ''
    ) || number;
  
for (let i = 0; i < 20; i += 1) {
    console.log(`${i}: ${test(i)}`);
}