const trim = (str, chars = " \n\r\t\v\0", flags = 0) => {
    let start = 0;
    let end = str.length;

    if(flags & 0x01)
        while(start < end && chars.indexOf(str[start]) >= 0)
            ++start;

    if(flags & 0x02)
        while(end > start && chars.indexOf(str[end - 1]) >= 0)
            --end;

    if(start > 0 || end < str.length)
        return str.substring(start, end);

    return str;
};

export const trimStart = (str, chars) => trim(str, chars, 0x01);
export const trimEnd = (str, chars) => trim(str, chars, 0x02);
export const trim = (str, chars) => trim(str, chars, 0x03);