JavaScript Object prototype

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Example

Use the prototype property to add a new property to all objects of a given type:

function employee(name, jobtitle, born) {
this.name = name;
this.jobtitle = jobtitle;
this.born = born;
}
employee.prototype.salary = 2000;

const fred = new employee("Fred Flintstone", "Caveman", 1970);

Try it Yourself »

Description

The prototype is a global property available with all JavaScript objects.

The prototype property allows you to add new properties and methods to objects.

Syntax

object.prototype.name = value

Browser Support

prototype is an ECMAScript1 (ES1) feature.

ES1 (JavaScript 1997) is fully supported in all browsers:


Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	Yes

JavaScript Objects

JavaScript Object Definition

JavaScript Object Methods

JavaScript Object Properties