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task #12087: Provide error messages when attempting to extend or implement nonsensical values

Submitter:  Mike Gerwitz <mikegerwitz>
Submitted:  Sat 09 Jun 2012 10:49:26 PM UTC
   
 
Should Start On:  Wed 01 Aug 2012 04:00:00 AM UTC Should be Finished on:  Sat 01 Mar 2014 05:00:00 AM UTC
Category:  Core Priority:  5 - Normal
Item Group:  Development Status:  None
Privacy:  Public Assigned to:  mikegerwitz
Percent Complete:  0% Open/Closed:  Open
Planned Release:  None
Keywords:  implement, classes, interfaces, extend

Sat 09 Jun 2012 10:49:26 PM UTC, original submission:  

When extending from an undefined value, no supertype is inherited. However, it is more likely that the user mistyped a variable/property. Such an incident would be a fairly serious bug in the software, so we should throw an error to notify the developer that they likely did something wrong.

When implementing interfaces, a cryptic error is thrown. Throw a useful error.

For example:

Class.extend( undefined, {} );
Class.implement( undefined );

Mike Gerwitz <mikegerwitz>
Group administrator

 

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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2015-05-20 mikegerwitz Planned Release0.2.0 None
    2014-01-22 mikegerwitz Planned Release0.1.1 0.2.0
    2014-01-22 mikegerwitz Should be Finished on2012-09-01 2014-03-01
    2012-06-09 mikegerwitz Planned ReleaseNone 0.1.1

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