Convert string to hex character codes

// Takes in a 12 character string and converts
// input each character to an equivalent hex code.
// Concatenates the hex codes into a single string
// and returns that.
const toHex = (str) => {
    var result = '';
    for (var i=0;i<str.length;i++){
        result += str.charCodeAt(i).toString(16);
    }
    return result;
}