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JavaScript String prototype Property

String Object Reference JavaScript String Object

Example

Use the prototype property to add a property to an object:

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

var fred=new employee("Fred Flintstone","Caveman",1970);
employee.prototype.salary=null;
fred.salary=20000;

document.write(fred.salary);

The output of the code above will be:

20000

Try it yourself »

Definition and Usage

The prototype property allows you to add properties and methods to an object.

Note: Prototype is a global property which is available with almost all JavaScript objects.


Browser Support

Internet Explorer Firefox Opera Google Chrome Safari

The prototype property is supported in all major browsers.


Syntax

object.prototype.name=value


Technical Details

Return Value: A reference to the String.prototype object
JavaScript Version: 1.1


String Object Reference JavaScript String Object

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