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State changes trigger events called reactions, that in turn change other states. A coherent execution order is one in which each reaction executes before any others that are affected by its changes. A coherent order is discovered iteratively by detecting incoherencies as they occur and backtracking
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Side effects are both the essence and bane of imperative programming. The programmer must carefully coordinate actions to manage their side effects upon each other. Such coordination is complex, error-prone, and fragile. Coherent reaction is a new model of change-driven computation that coordinates
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Jonathan
Edwards. MIT CSAIL draft paper in March 2006. Detailed description and illustrations of the various functional programming elements within the first Subtext environment, including data flow, assignments, "action" invocation, current and hypothetical data state, concurrent transactions and
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Subtext programs are declared and manipulated (or mutated) by adding and linking elements of various types to a syntax tree, and entering in values or names as necessary, as opposed to typing out textual programs. Due to the design of the
Subtext language and environment, there is no distinction
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Jonathan
Edwards. In OOPSLA Onward '09. Documents the beginnings of an experimental programming language loosely based upon Subtext, which uses "Coherent reaction", a new model of change-driven computation to coordinate the effects and side-effects of programs automatically.
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Early build of the
Subtext environment with the program's current state visible. The employee data (like "wage") is visibly changed after invoking the "Raise" method by clicking its "invoke arrow", and the hypothetical state (displayed within the Raise method) is also
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Jonathan
Edwards. In OOPSLA October ’04. Describing IDE improvements using advanced UI techniques to present the results of a program during development, instead of the programmer interpreting the program code mentally. Screenshots from a prototype IDE using
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their effects. The fundamental building block of
Coherence is the dynamically typed mutable tree. The fundamental abstraction mechanism is the virtual tree, whose value is lazily computed, and whose behavior is generated by coherent reactions.
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as users update cells, for frequent feedback. It is intended to eventually be developed enough to become a practical language for daily use. It is planned to be open software; the license is not yet determined.
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between a program's representation and its execution. Like spreadsheets, Subtext programs are live executions within an environment and runtime, and programming is direct manipulation of these executions via a
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Early video previews of the
Subtext environment were released circa 2006, which demonstrated the semantics of Subtext programs, and the close integration with the Subtex environment and runtime.
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languages, Subtext has simple semantics and is easily applicable to reactive systems that require mutable state, I/O, and concurrency, under a model known as "Reactive
Programming".
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Jonathan
Edwards. In OOPSLA October ’05: Proceedings of the 20th annual ACM SIGPLAN conference on Object-oriented programming, systems, languages, and applications.
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model, called
Example Centric Programming, by treating copied blocks as first class prototypes, for program structure. It uses live text, similar to what occurs in
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of the topic and provide significant coverage of it beyond a mere trivial mention. If notability cannot be shown, the article is likely to be
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input ("invocations") can be utilized via data flow within a Subtext program, allowing users to manipulate values interactively.
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An alpha build of the Subtext environment, which illustrates the unique "polymorphic conditionals" present in the IDE.
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effects automatically. Automatically coordinating actions lets the programmer express what to do, not when to do it.
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Subtext was created by Jonathan Edwards who submitted a paper on the language to
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A continuation and subset of the Subtext language using other principles, is
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Early build of the Subtext environment with interactive console inputs.
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Please help to demonstrate the notability of the topic by citing
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illustrate the techniques with functional examples.
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