how to get length of array in jquery

<script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script>
<script>
function chksame(cl) {
var newArray = new Array();

var classnm = $(cl).attr("class");
 
var array = $("input[class^= '" + classnm + "']"); //get value by class name

$.each(array, function(key, value) {
card_value = array.eq(key).val();
   newArray.push(card_value);//push value in array.
  
});

counts = {};
jQuery.each(newArray, function(key,value) {
  if (!counts.hasOwnProperty(value)) {
    counts[value] = 1; //set count value
  } else {
    counts[value]++;
  }
 
  if(counts[value]>1 && value!="") //check if value greater than then alert massege.
  {
  alert("This order already exist");
  $(cl).val("");
  }
});
return false;
}
</script>