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Add a method to a JavaScript object constructor?
In this article we are going to discuss how to add a method to a JavaScript object constructor with suitable examples in JavaScript.
In JavaScript adding a method to an object constructor is unlike adding a method to a normal object. We cannot add a method as it is the case with a normal object. To make a method in an object constructor it has to be added inside the object constructor.
Let’s understand this concept in a better way with the help of the examples further in this article.
Example 1
In the following example, the method is added inside the constructor, therefore, we have got a legitimate value.
<html>
<body>
<script>
function Business(name, property, age, designation) {
this.Name = name;
this.prop = property;
this.age = age;
this.designation = designation;
this.name = function() {
return this.Name
};
}
var person1 = new Business("Bill gates", "$28.05billion", "71", "Owner");
document.write(person1.name());
</script>
</body>
</html>
On executing the above code, the below output is generated.
Example 2
This is another example program to add a method to the JS object contructor.
<!DOCTYPE html>
<html>
<head>
<title>To add a method to a JavaScript Object Constructor.</title>
</head>
<body style="text-align : center">
<h3>Add a method to a JavaScript Object Constructor.</h3>
<p id="method-to-obj-constructor"></p>
<script>
function Car(name, model, year, color) {
this.Name = name;
this.Model = model;
this.Year = year;
this.Color = color;
this.type = 'SUV';
this.description = function() {
return this.Name+" is of "+this.Model+" model and launched in the year "+this.Year+" and is of "+this.type+" type."
}
}
var car1 = new Car("Maruti", "Vitara Brezza", "2016", "Red");
document.getElementById("method-to-obj-constructor").innerHTML = car1.description();
</script>
</body>
</html>
On executing the above code, the below output is generated.
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