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

P T Withington ptw at pobox.com
Tue Feb 1 11:09:53 PST 2011


[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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