jQuery Fix Heights on Columns

/* FIX HEIGHTS ON FOOTER COLUMNS */
function sortNumber(a ,b){
    return a - b;
}
var hColA   = $('.footerColA').height();
var hColB   = $('.footerColB').height();
var hColC   = $('.footerColC').height();
var hCols   = [hColA, hColB, hColC];
hCols       = hCols.sort(sortNumber);   // calls above function
var maxHeight   = hCols[hCols.length-1];
$('.footerColA').height(maxHeight);
$('.footerColB').height(maxHeight);
$('.footerColC').height(maxHeight);