proName

Required. String value of a property name.

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.

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

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

The output of this program is:

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false true

Version 5.5

Reference