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[REBOL] Re: Binding problem with 'do

From: lmecir::mbox::vol::cz at: 31-Jul-2005 23:24

Tim Johnson napsal(a):
>* Ladislav Mecir <[lmecir--mbox--vol--cz]> [050731 02:18]: > >>> code: load rejoin["append output do-" type " name layout"] >>> ?? code ;; see code "dump" below >>> do code >>> ] >>> ] >>> >>> >>> >>> >>...snip... >> >>that load rejoin [...] is a "beginner's gotcha" described in the doc. It >>brings more problems that it can solve. Don't use "command strings" when >>you don't have to, always use blocks - it is faster, safer and simpler. >>What about this one? >> >> > > Hi Ladislav: > > Boy am I behind in docs! What I have doesn't have any gotchas. > Can you point me to those docs? >
See e.g. Unless it is necessary, evaluating strings is not generally a good practice...
>>type-handler: make object! [ >> button: func [name layout] [print "this is do-button" 'do-button] >> checkbox: func [name layout] [print "this is do-checkbox" 'do-checkbox] >> time: func [name layout] [print "this is do-time" 'do-time] >> hidden: func [name layout] [print "this is do-hidden" 'do-hidden] >> radio: func [name layout] [print "this is do-radio" 'do-radio] >> >> > > That's almost pythonistic in it's engineering (from me that's a > complement) :-). However, if I understand you correctly, it would > be as large and repetitive as the original switch. >
That may be a misunderstanding. As far as I understand your code it uses a set of functions called DO-BUTTON, DO-CHECKBOX, DO-TIME, DO-HIDDEN, DO-RADIO, but you didn't "provide" them. So I just wrote a "bogus" implementation of the above mentioned functions to have a more complete example, that is all.