typeof - Returns the datatype of an element.
// Basic use
var myvar=5
alert(typeof myvar) //alerts "number"
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// RL example
var seriesName = $("#Series").val();
var seriesNameToString = seriesName.toString();
alert("Series Name val() is : " + seriesName);
alert(" SeriesName.val() toString() result : " + seriesNameToString);
alert("typeof SeriesName ToString :" + typeof seriesNameToString);