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JavaScript Array Apply

                         

In this section, you will study how to use the apply() method.  

In the given example, we have create the constructor for an object called Car which has two properties 'model' and 'year'. Then, we have created the constructor for another object 'MyCar' which inherits the properties from the Car object and adds one property of its own i.e. 'no'. The MyCar constructor uses the apply method to call the Car constructor. In the Car function, the keyword 'this' refers to MyCar object.

Syntax : function.apply(thisArg[, argsArray])
The apply method call a function and specify what the keyword 'this' will refer to. The thisArg argument should be 'this' keyword. The second argument of the apply method is an array. The elements of this array will be passed as the arguments to the function being called.  

 

Here is the code:

<html>
<head>
<h2>Use of apply() method</h2>
<script type="text/javascript" language="javascript">
function Car(model, year)
{
this.model = model;
this.year = year;
}
function MyCar(no,model, year)
{
this.no = no;
Car.apply(this, new Array(model, year))
}
newCar = new MyCar(1000,"Nano",2008)
document.write( "TATA "+newCar.model+",the people's car, "+"
       has been launched at the end of the year "+ newCar.year+".");
</script>
</head>
</html>

Output will be displayed as:

Download Source Code

                         

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