hasOwnProperty Method

Returns a Boolean value indicating whether an object has a property with the specified name.

function hasOwnProperty(proName : String) : Boolean

Arguments

• proName
  Required. String value of a property name.

Remarks

The hasOwnProperty method returns true if the object has a property of the specified name, false if it does not. This method does not check if the property exists in the object's prototype chain; the property must be a member of the object itself.

Example

In the following example, all String objects share a common split method.

var s = new String("JScript");
print (s.hasOwnProperty("split"));
print (String.prototype.hasOwnProperty("split"));

The output of this program is:

false
true

Requirements

Version 5.5

Applies To:

Object Object

See Also

Reference

in Operator

Change History

Date	History	Reason
July 2009	Modified example.	Content bug fix.
March 2009	Modified example.	Content bug fix.