JavaScript Boolean prototype Constructor
Example
Make a new method for JavaScript booleans:
Boolean.prototype.myColor = function() {
if (this.valueOf() == true) {
return "green";
} else {
return = "red";
}
};
Create a boolean, then call myColor():
var a = true;
var b = a.myColor();
Try it Yourself »
Definition and Usage
The prototype constructor allows you to add new properties and methods to
JavaScript booleans.
When constructing a property, ALL booleans will be given the property, and its value, as default.
When constructing a method, ALL booleans will have this method available.
Note: Boolean.prototype does not refer to a single boolean, but to the Boolean() object itself.
Note: Prototype is a global object constructor which is available for all JavaScript objects.
Browser Support
| Property | |||||
|---|---|---|---|---|---|
| prototype | Yes | Yes | Yes | Yes | Yes |
Syntax
Boolean.prototype.name = value
Related Pages
JavaScript Tutorial: JavaScript Booleans
JavaScript Tutorial: JavaScript Object Constructors
