Converts an integer to its roman numeral representation

Convert digits to roman numeral in Javascript.js

/**
 * Converts a given number to a Roman numeral representation.
 *
 * @param {number} num - The number to be converted.
 * @return {string} The Roman numeral representation of the given number.
 */
function toRomanNumeral(num) {
    const lookup = new Map([
        [1000, "M"],
        [900, "CM"],
        [500, "D"],
        [400, "CD"],
        [100, "C"],
        [90, "XC"],
        [50, "L"],
        [40, "XL"],
        [10, "X"],
        [9, "IX"],
        [5, "V"],
        [4, "IV"],
        [1, "I"],
    ])

    let result = ""

    for (const [value, symbol] of lookup) {
        while (num >= value) {
            result += symbol
            num -= value
        }
    }

    return result
}

toRomanNumeral(3)       //= 'III'
toRomanNumeral(11)      //= 'XI'
toRomanNumeral(1998)    //= 'MCMXCVIII'