User-defined constructors

Provides a reference of user-defined constructors.

In addition to the Object constructor, any user-defined function can be used as an object constructor.

Table 1. User-defined constructors
Syntax	Effect
new function(arg1, ..., argn)	Creates a new object, then calls`function(arg1, ..., argn)` to initialize it.

Inside the constructor, the keyword this can be used to make reference to the object being initialized.

For example, the following program defines a constructor for cars:


function Car(name, year) {
  this.name = name;
  this.year = year;
  this.start = start_engine;
}

Now, calling


new Car("Ford", "1985")

creates a new object with the properties name and year, and a start method.