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JavaScript PolymorphismThe polymorphism is a core concept of an object-oriented paradigm that provides a way to perform a single action in different forms. It provides an ability to call the same method on different JavaScript objects. As JavaScript is not a type-safe language, we can pass any type of data members with the methods. JavaScript Polymorphism Example 1Let's see an example where a child class object invokes the parent class method.
<script>
class A
{
display()
{
document.writeln("A is invoked");
}
}
class B extends A
{
}
var b=new B();
b.display();
</script>
Output: A is invoked Example 2Let's see an example where a child and parent class contains the same method. Here, the object of child class invokes both classes method.
<script>
class A
{
display()
{
document.writeln("A is invoked<br>");
}
}
class B extends A
{
display()
{
document.writeln("B is invoked");
}
}
var a=[new A(), new B()]
a.forEach(function(msg)
{
msg.display();
});
</script>
Output: A is invoked B is invoked Example 3Let's see the same example with prototype-based approach.
<script>
function A()
{
}
A.prototype.display=function()
{
return "A is invoked";
}
function B()
{
}
B.prototype=Object.create(A.prototype);
var a=[new A(), new B()]
a.forEach(function(msg)
{
document.writeln(msg.display()+"<br>");
});
<script>
Output: A is invoked B is invoked
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