JavaScript Instanceof Operator
Below is the example of the Instanceof Operator.
- Example:
<!DOCTYPE html><html><body><center><h1style="color:green">GeeksforGeeks</h1><pid="GFG"></p><script>var a = ["Geeks", "for", "Geeks"];document.getElementById("GFG").innerHTML =(a instanceof Array) + "<br>" +(a instanceof Number);</script></center></body></html> - Output:
The instanceof operator in JavaScript is used to check the type of an object at run time. It returns a boolean value 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-1: objectTypes.
<!DOCTYPE html><html> <body> <center> <h1 style="color:green">GeeksforGeeks</h1> <p id="GFG"></p> <script> var fruits = ["Apple", "Mango", "Banana"]; document.getElementById("GFG").innerHTML = (fruits instanceof Array) + "<br>" + (fruits instanceof Object) + "<br>" + (fruits instanceof String) + "<br>" + (fruits instanceof Number); </script> </center></body> </html> |
Output:
Example-2: Demonstrating that String and Date objects are also a type of Object (derived from Object).
<!DOCTYPE html><html> <body> <h1 style="color:green">GeeksforGeeks</h1> <p id="GFG"></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
Supported Browsers:
- Google Chrome
- Firefox
- Edge
- Opera
- Apple Safari
