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Showing content from https://webplatform.github.io/docs/javascript/operators/instanceof below:

instanceof · WebPlatform Docs

Returns a Boolean value that indicates whether or not an object is an instance of a particular class.

result = object instanceof class

result

Required. Any variable.

object

Required. Any object expression.

class

Required. Any defined object class.

The following example shows how to use the instanceof operator.

function objTest(obj){
     var i, t, s = "";
     t = new Array();
     t["Date"] = Date;
     t["Object"] = Object;
     t["Array"] = Array;
         for (i in t){
             if (obj instanceof t[i]) {
                 s += "obj is an instance of " + i + "<br/>";
             }
             else {
                 s += "obj is not an instance of " + i + "<br/>";
         }
     }
     return(s);
 }

 var obj = new Date();
 document.write(objTest(obj));

 
 
 
 

The instanceof operator returns true if object is an instance of class. It returns false if object is not an instance of class, or if object is null.

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