On Separating Values and Effects

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Computability Theory is the foundation for computer software development. Our programming languages embody the techniques and models described by various theories of computation [1]. The Turing Machine is the canonical example of the Imperative Model [2]. Lambda Calculus is the canonical example of the Functional Model [3]. Kleene’s Church–Turing Thesis asserts the equivalence of these […]

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Evaluating Expressions, part 7 – Transactions and Exceptions

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In part 7 of our series implementing programming language constructs with actors, we implement parallel execution of block statements. Parallel execution motivates the use of single-assignment data-flow variables. We also introduce transactions and exception handling. The only extension required to our grammar from part 6 is the inclusion of a THROW statement: stmt ::= ‘LET’ […]

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