[Seaside] Task Escape
keith_hodges at yahoo.co.uk
Wed Jan 9 22:14:59 UTC 2008
Keith Hodges wrote:
> or... you could try a message eating null. I know that people are alway
> suspicious of letting message eating null loose in their code, however I
> do think that in a specific controlled situation it can be very useful.
> You example becomes...
> self stepOne stepTwo stepThree.
> if any of the steps returns Null then the subsequent steps are passed over.
> Null is available in universes.
And you can explicitly test whether anyone cancelled.
self stepOne stepTwo stepThree ifNull: [ "they cancelled" ]
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