Rather than ‘Array with:with:’ it probably should be ‘ExceptionSet with:with:’.
> On May 25, 2023, at 9:19 AM, James Foster via Pharo-users
> <pharo-users@lists.pharo.org> wrote:
>
> The #’on:do:’ implementation in Block accepts either an Exception or an
> ExceptionSet as the first parameter. So you can do something like the
> following (I’m typing from memory without trying so may have syntax errrors):
>
> [ “tryBlock” ] on: (Array with: ExceptionOne with: ExceptionTwo) do: [:ex |
> (ex isKindOf: ExceptionOne) ifTrue: [ “handleOne” ].
> (ex isKindOf: ExceptionTwo) ifTrue: [ “handleTwo” ].
> ].
>
> The above code can be improved in a variety of ways, but it should get you
> started. Note also that since Smalltalk allows you to modify base classes,
> you could add #’on:do:on:do:’ to Block.
>
> James
>
>> On May 25, 2023, at 8:24 AM, mlnt...@gmail.com wrote:
>>
>> In other languages there is the possibility to chain exception handlers like
>> this:
>>
>> try { doOne(); doTwo(); doThree(); }
>>
>> catch(ExceptionOne ex){
>>
>> handleOne();
>>
>> }
>>
>> catch(ExceptionTwo ex) {
>>
>> handleTwo();
>>
>> }
>>
>> catch(ExceptionThree ex) {
>>
>> handleThree();
>>
>> }
>>
>> catch(Exception ex) {
>>
>> handleRest();
>>
>> }
>>
>> Is this possible in Pharo? I’ve tried
>>
>> [ block ]
>>
>> on: ExceptionOne do: [ handleOne ]
>>
>> on: ExceptionTwo do: [ handleTwo ]
>>
>> but it is invalid syntax.
>>
>
