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: This method accepts a single parameter.
- objectName: States the name of the Object.
Return Value: This method 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.
Example 1: Below is the example of the Instanceof Operator.
html
<h1 style="color:green"> neveropen</h1><h3> Instanceof Operator.</h3><p id="GFG"></p><script> var a = ["Geeks", "for", "Geeks"]; document.getElementById("GFG").innerHTML = (a instanceof Array) + "<br>" + (a instanceof Number);</script> |
Output:
JavaScript Instanceof Operator
Example 2:
html
<h1 style="color:green"> neveropen</h1><h3> Instanceof Operator.</h3><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> |
Output:
JavaScript Instanceof Operator
Example 3: Demonstrating that String and Date objects are also a type of Object (derived from Object).
Javascript
<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> |
Output:
true false true true true false
We have a complete list of Javascript Operators, to check those please go through the Javascript Operators Complete Reference article.
Supported Browsers:
- Google Chrome
- Firefox
- Edge
- Opera
- Apple Safari
