Entry: JSPROP_PERMANENT (Macro)
Summary: Flag that indicates a property is permanent and cannot be deleted.
Syntax:
JSPROP_PERMANENT
Description:
JSPROP_PERMANENT is a flag value that indicates that the property belonging to a JS object is a "permanent" property, one that cannot be deleted from the object at run time. Attempting to delete a permanent property is JavaScript 1.2 or lower results in an error. In JavaScript 1.3 and ECMA-Script, such deletion attempts are ignored. You can, however, always check the flags fields to determine if a property is permanent.
See also:
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