Roman Numeral Converter - I don't think it's bad, but want to know how to Refactor the function

Roman Numeral Converter - I don't think it's bad, but want to know how to Refactor the function
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#1

Title says it all.
I know that I can get rid of the letter/value keys in the array,
I’m wondering how I can keep the basic outline of the function but make it cleaner

function convertToRoman(num) {
    // Create array of Roman Numeral Combinations
    var arrRomanNumerals = [
        {"letter":"M","value": 1000},
        {"letter":"CM","value": 900},
        {"letter":"D","value": 500},
        {"letter":"CD","value": 400},
        {"letter":"C","value": 100},
        {"letter":"XC","value": 90},
        {"letter":"L","value": 50},
        {"letter":"XL","value": 40},
        {"letter":"X","value": 10},
        {"letter":"IX","value": 9},
        {"letter":"V","value": 5},
        {"letter":"IV","value": 4},
        {"letter":"I","value": 1}
        ];
    if(num < 1 || num >3999){
        console.log('Enter a number between 1 and 3999');
        } else {
            var res = "";
            for (var key in arrRomanNumerals) {
                if (arrRomanNumerals.hasOwnProperty(key)) {
                    value = arrRomanNumerals[key].value;
                    letter = arrRomanNumerals[key].letter;
                    quotient = Math.floor(remainder/value);
                    remainder = remainder % value;
                    strLetter = letter.repeat(quotient);
                    res = res+strLetter;
                    return(res);
                    }
                }
            }
        }