instance of code example

Example 1: instance of

The instanceof keyword checks whether an object
is an instance of a specific class or an interface.
The instanceof keyword compares the
instance with type. The return value
is either true or false .

Example 2: js class check if new instance

new Date() instanceof Date;  // => true

Example 3: insanceof

The instanceof operator tests to see if the prototype property of a constructor 
appears anywhere in the prototype chain of an object. The return value is a 
boolean value.
For example :-

function Car(make, model, year) {
  this.make = make;
  this.model = model;
  this.year = year;
}
const auto = new Car('Honda', 'Accord', 1998);

console.log(auto instanceof Car);
// expected output: true

console.log(auto instanceof Object);
// expected output: true

Example 4: Explain about instanceof operator in java

An instanceof in Java is a comparison operator which, given an object instance, 
checks whether that instance is of a specified type (class/sub-class/interface) 
or not. Just like other comparison operators, it returns true or false.

Comparing any object instance with a null type through instanceof operator 
returns a false.
  
Instanceof operator is used to test the object is of which type.

Syntax : <reference expression> instanceof <destination type>
Instanceof returns true if reference expression is subtype of destination type.
Instanceof returns false if reference expression is null.

Example 5: instance of

if (cobj instanceof Child) 
	System.out.println("cobj is instance of Child"); 
else
	System.out.println("cobj is NOT instance of Child"); 
    
// Source: https://www.geeksforgeeks.org/java-instanceof-and-its-applications/