Functional FizzBuzz

fizzbuzz.ts

// Logic
type FizzBuzzOutput = (x: number) => string
const Fizz : FizzBuzzOutput = x => (x % 3 === 0) ? "Fizz" : ""
const Buzz : FizzBuzzOutput = x => (x % 5 === 0) ? "Buzz" : ""
const FizzBuzzPrint : FizzBuzzOutput = x => Fizz(x) + Buzz(x)

type FizzBuzz = (x: number) => Array<string>
const FizzBuzz : FizzBuzz = x => x < 1 ? [] : [...FizzBuzz(x-1), FizzBuzzPrint(x)]

// Execution
console.log(FizzBuzz(100))