solution.js

function arabicToRoman(number) {
  const letters = [
    ["M", 1000],
    ["CM", 900],
    ["D", 500],
    ["CD", 400],
    ["C", 100],
    ["XC", 90],
    ["L", 50],
    ["XL", 40],
    ["X", 10],
    ["IX", 9],
    ["V", 5],
    ["IV", 4],
    ["I", 1]
  ];

  let roman = "";

  while (number > 0) {
    // Find the largest letter which has a value less than or equal to than the remaining value.
    const [letter, value] = letters.find(([, value]) => number >= value);

    roman += letter;
    number -= value;
  }

  return roman;
}