idea: try/catch and "rethrow"...?

P T Withington ptw at pobox.com
Tue Feb 1 11:37:41 PST 2011


Us old geezers have a tendency to repeat ourselves...  If you remind me often enough, perhaps I'll stop.  But it _is_ seductive!

On 2011-02-01, at 14:14, Brendan Eich wrote:

> Deja vu all over again:
> 
> https://mail.mozilla.org/pipermail/es-discuss/2007-March/004076.html
> 
> /be
> 
> 
> On Feb 1, 2011, at 11:09 AM, P T Withington wrote:
> 
>> [Interested bystander 2p.]
>> 
>> The thing you are looking for is common in other advanced dynamic languages (mostly Lisp derivatives, see http://en.wikipedia.org/wiki/Exception_handling#Condition_systems).  It is the concept of handling the condition in the context where the condition is signaled, rather than magically unwinding the stack looking for catch blocks to throw to.  DOM2 has a similar distinction, whether to handle an event in the 'capturing' phase or the 'bubbling' phase.
>> 
>> try/catch can be implemented in terms of condition handling, but not the other way around.  I would be all in favor of adding condition handling to JS, and recasting try/catch as syntactic sugar.
>> 
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