[squeak-dev] The Trunk: MorphicExtras-cmm.201.mcz

Chris Muller ma.chris.m at gmail.com
Wed Dec 14 20:17:57 UTC 2016

On Wed, Dec 14, 2016 at 12:13 PM, Bert Freudenberg <bert at freudenbergs.de> wrote:
> On Tue, Dec 13, 2016 at 11:52 AM, Chris Muller <asqueaker at gmail.com> wrote:
>> > Instead of checking for "understands" we should use valueOfFlag: (which
>> > defaults to false) to get back the old behavior.
>> Hmm, I'm not sure "false" makes sense as a universal default value.
> False is the default for valueOfFlag:. It is nil for valueOfPreference:.
>> Apps typically choose their own lazy-initialized values
>> attribute-by-attribute, and usually based on it having been nil.
> We're talking about old-style preferences which IMHO used to be a very
> convenient, succinct, and highly readable. We just wrote "Preferences myFlag
> ifTrue: [...]" and this would universally work *without any other support
> code*. This was really nice for live experimenting, you just throw this
> expression in somewhere without having to worry about breaking anything.

Even though I struggle with seemingly arbitrary default, I can
actually appreciate that point.  Its like, better "usability" for the
programmer.  And with the #valueOfPreference: maintaining access to
the true internal value, seems like a good balance with functionality
needed for other use-cases.   +1


More information about the Squeak-dev mailing list