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All JavaScript objects inherit properties and methods from a prototype.
In the previous chapter we learned how to use an object constructor.
function Employee(name, email) {
this.name = name;
this.email = email;
}
const manager = new Employee("John Doe", "john@gmail.com");
const receptionist = new Employee("Neelam Singh", "neelam@gmail.com");
We also learned that you can not add a new property to an existing object constructor.
Employee.ager= 35;
To add a new property to a constructor, you must add it to the constructor function.
function Employee(name, email) {
this.name = name;
this.email = email;
this.age = 18;
}
All JavaScript objects inherit properties and methods from a prototype:
The Object.prototype is on the top of the prototype inheritance chain.
Date objects, Array objects, and Employee objects inherit from Object.prototype.
Sometimes you want to add new properties (or methods) to all existing objects of a given type.
Sometimes you want to add new properties (or methods) to an object constructor.
The JavaScript prototype property allows you to add new properties to object constructors.
function Employee(name, email) {
this.name = name;
this.email = email;
}
Employee.prototype.age = 18;
The JavaScript prototype property also allows you to add new methods to objects constructors.
function Employee(name, email) {
this.name = name;
this.email = email;
}
Employee.prototype.greeting = function() {
return "Hello " + this.name;
};
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