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Javascript-instanceOf

 

The instanceof operator in JavaScript is defined to check the type of an object at run time. It calls a boolean values if true then it indicates that the object is an instance of a particular class and if false then it is not.

 

Syntax:

 

var gfg = objectName instanceof objectType

 

Parameters:

 

objectName: States the name of Object.

 

Example: 

 

objectTypes.

 

<!DOCTYPE html>
<html>

<body>
      <center>
             <h1 style="color:yellow">I2TUTORIALS</h1>

             <p id="i2"></p>

             <script>

                    var fruits = ["Apple", "Mango", "Banana"];

                    document.getElementById("i2").innerHTML =
                          (fruits instanceof Array) + "<br>" +
                          (fruits instanceof Object) + "<br>" +
                          (fruits instanceof String) + "<br>" +
                          (fruits instanceof Number);
             </script>
      </center>
</body>

</html>

 

OUTPUT:

 

I2TUTORIALS
true
true
false
false

 

Example:

 

String and Date objects

 

<!DOCTYPE html>
<html>

<body>
       <h1 style="color:yellow">I2Tutorials</h1>

       <p id="i2"></p>

       <script>
              var myString = new String();
              var myDate = new Date();

              console.log(myString instanceof Object);
              console.log(myString instanceof Date);
              console.log(myString instanceof String);
              console.log(myDate instanceof Date);
              console.log(myDate instanceof Object);
              console.log(myDate instanceof String);
      </script>
</body>

</html>

 

OUTPUT:

 

I2Tutorials
Console LOg
true
false
true
true
true
false

 

Supported Browsers:

 

Google Chrome

Firefox

Edge

Opera

Apple Safari