reduce-my-fraction.js

/*
Write a function which reduces fractions to their simplest form! Fractions will be presented as an array/tuple (depending on the language) of strictly positive integers, and the reduced fraction must be returned as an array/tuple:

input:   [numerator, denominator]
output:  [reduced numerator, reduced denominator]
example: [45, 120] --> [3, 8]
All numerators and denominators will be positive integers.

Note: This is an introductory Kata for a series... coming soon!
*/

function reduce(fraction) {
  let num = fraction[0]
  let den = fraction[1]
  for (let i = num; i > 0; i--){
    if (num % i ==0 && den % i ==0){
      return [num/i, den/i]
    }
  }
}