Count bytes in array

bytesInArray.js

function getByteCount(s) {
    var count = 0,
        stringLength = s.length,
        i;
    s = String(s || "");
    for (i = 0; i < stringLength; i++) {
        var partCount = encodeURI(s[i]).split("%").length;
        count += partCount == 1 ? 1 : partCount - 1;
    }
    return count;
}