Beginners March 2018

beginners@lists.squeakfoundation.org

4 participants
2 discussions

AMB
by Sean P. DeNigris 31 Mar '18

31 Mar '18

Is anyone familiar with the AMB project, installable from SqMap catalog? I got excited by the description's assertion that "it can do incredible things" (it even provided an example. After reading the description, tests, code, and references, I have an inkling what it does, but don't quite understand what is "incredible" about it and don't want to miss the magic!! The catalog description is: This is the "ambigous", "nondeterminist", "angelic" operator aka amb ... more seriously described as a declarative control flow statement able to enumerate over finite domains all values that make a program terminate. It uses continuations to walk the tree of possible tuples, backtracking when the program fails. The amazing thing is the simplicity of the code: four short or very short methods on the instance side, the class side methods only providing syntactic sugar. And it can do incredible things such as: AMB assert: [:string :n :char | (string occurrencesOf: char) = n] over: #('maman' 'barbapapa' 'guiliguili' 'arthur' 'chtulu') and: #(2 4 1) and: #($m $b $a $i $u) See AMBTest for more magic. I would have been unable to implement this by myself ! This is a port of the code by Dorai Sitaram which is the reference documentation for amb: http://www.ccs.neu.edu/home/dorai/t-y-scheme/t-y-scheme-Z-H-16.html#node_ch… ----- Cheers, Sean -- Sent from: http://forum.world.st/Squeak-Beginners-f107673.html

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Class Variables in #Object
by John-Reed Maffeo 20 Mar '18

20 Mar '18

In my current Image ----- C:\Smalltalk\Squeak5.1-16549-64bit-201608180858-Windows\Squeak5.1-16549-64bit-201608180858-Windows\Squeak5.1-16549-64bit.4.image Squeak5.1 latest update: #16551 Current Change Set: Example Image format 68021 (64 bit) I am studying class #Object. The class comments identify two Class Variables: DependentsFields an IdentityDictionary EventsFields an IdentityDictionary but the class definition only defines DependentsFields. What am I missing here? Thanks, jrm

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Beginners March 2018