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August 2021

Find of the Month!

  • Michael Jastram and Andreas Kara (2016), Modeling Requirements with Constraintshttps://re-magazine.ireb.org/articles/modeling-requirements-with-constraints
    • Refactored activity diagram looks very much like the reactive loop model in the SAM pattern where actions and/or mutations are constrained by acceptors and/or next-action predicates.
    • Reached this when I searched for "constraint modeling" after reading Nancy Leveson's A New Accident Model for Engineering Safer Systems, specifically section 3.1 The Central Role of Constraints in System Safety, which begins:

      The most basic concept in the new model is not an event, but a constraint. In systems theory, control is always associated with the imposition of constraints. The cause of an accident, instead of being understood in terms of a series of events, is viewed as the result of a lack of constraints imposed on the system design and on operations, that is, by inadequate enforcement of constraints on behavior at each level of a socio-technical system. In systems theory terminology, safety is an emergent property that arises when the system components interact within an environment. Emergent properties are controlled or enforced by a set of constraints (control laws) related to the behavior of the system components. Accidents result from a lack of appropriate constraints on the interactions.

Async state

Browser

Programming

  • Uri Valevski (2020), Graph Programminghttps://www.hyro.ai/post/graph-programming

    This work presents the notion of graph programming, a way to program by building graphs of functions from connecting pairs of functions in a non-enclosing way, and aims to replace typical function composition.

  • Steven Wittens (2021), Headless Reacthttps://acko.net/blog/live-headless-react/
    • Neither a typo, redundancy, nor oxymoron.
    • Site is nifty with a lot of cool CSS and other effects, plus deep dive posts on programming structure.