Exams - The Numbers

/* Your job is to clear the text from any unnecessary symbols (only the numbers are needed) and convert
the remaining number sequences to hex format. If a hex value has less than 4 characters, you need to add
leading zeros. Finally, you need to place a "0x" prefix before each hex value and concatenate them all with
dashes '-'. The input data will be received as an array. It contains one argument – the initial message
you need to transform. The output consists of only one line – the transformed message. */

function transformMessage(arr) {
    var numbers = arr[0].split(/[^0-9]+/g).filter(Boolean);
    for (var i = 0; i < numbers.length; i += 1) {
        var hex = Number(numbers[i]).toString(16).toUpperCase();
        while (hex.length < 4) {
            hex = '0'.concat(hex);
        }
        numbers[i] = '0x'.concat(hex);
    }

    return numbers.join('-');
}

console.log(transformMessage(['5tffwj(//*7837xzc2---34rlxXP%$”.']));
console.log(transformMessage(['482vMWo(*&^%$213;k!@41341((()&^>><///]42344p;e312']));
console.log(transformMessage(['20']));