This code removes whites paces, (fyi: it's credited to be very fast)

function wSpaceTrim(s){
    var start = -1,
    end = s.length;
    while (s.charCodeAt(--end) < 33 );  //here
    while (s.charCodeAt(++start) < 33 );  //here also 
    return s.slice( start, end + 1 );
}

The while loops don't have brackets, how would i correctly add brackets to this code?

while(iMean){
   like this;
}

Thank you so much!