Closed Bug 1228804 Opened 9 years ago Closed 9 years ago

Add that an unassigned property of an object is 'undefined'

Categories

(Developer Documentation Graveyard :: JavaScript, defect, P5)

Product:
Developer Documentation Graveyard
Component:
JavaScript
Platform:
All
Other
Type:
defect

Tracking

(Not tracked)

Status:
RESOLVED FIXED

People

(Reporter: jan, Unassigned)

References

(
URL
)

Details

:: Developer Documentation Request

      Request Type: Correction
     Gecko Version: unspecified
 Technical Contact: 

:: Details

Unassigned property of an object could be null (that's the case in other PLs - I don't know of another PL's that has undefined). Stackoverflow has only info about unassigned variable, and property of an object could be handled differently. CoffeeScript often test only for null even though a parameter is undefined - I did fall into that trap quite often, and you can't test for undefined there! - so the distinction is important and not completely obvious.
Added a note here:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects#Objects_and_properties
Status: UNCONFIRMED → RESOLVED
Closed: 9 years ago
Resolution: --- → FIXED
You need to log in before you can comment on or make changes to this bug.