Object constructor is a blueprint of an object, it is a function that is used to create an object.
function Person(first,last,age){
this.firstname= first;
this.lastname = last,
this.age = age;
}
const father = new Person('Jhon','Doe',24);
const mother = new Person('Jean','Doe',28);
In those example, we call Person
function two times, thereby it create two different instance of the functions, since we use new
keyword, it create two different object that set into father
and mother
variable.
However we cannot add new properties or methods to an object constructor directly in the way we add properties or methods to an object.
Person.nationality = "USA";
const father = new Person('Jhon','Doe',24);
father.nationality
// undefined
To add new properties or new methods to the object constructor, we can use prototype
Person.prototype.nationality = "USA";
father.nationality
// USA
Now every object created using the object constructor Person
will have property nationality
set to USA
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