A constructor belongs to a particular class object that is instantiated. The constructor initializes this object and can provide access to its private information. The concept of a constructor can be applied to most object-oriented programming languages. Essentially, a constructor in JavaScript is usually declared at the instance of a class.
Syntax
// This is a generic default constructor class Default
function Default() {
}
// This is an overloaded constructor class Overloaded
// with parameter arguments
function Overloaded(arg1, arg2, ...,argN){
}
To call the constructor of the class in JavaScript, use a new operator to assign a new object reference to a variable.
function Default() {
}
// A new reference of a Default object assigned to a
// local variable defaultReference
var defaultReference = new Default();
Learn more
General knowledge
- Constructor on Wikipedia