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Edwin Brady at Lambda World 2016


Type-driven Development of Communicating Systems in Idris

Idris is a functional programming language with dependent types, which supports ‘total’ functional programming. A function is total if, for all well-typed inputs, it gives either a complete result of a finite prefix of an infinite result, in finite time. Total functions give us strong guarantees about their behavior: for example functions can’t crash due to badly formed inputs, servers will always produce responses to requests. In this talk, I’ll show how Idris supports total programming, with a series of examples. As an extended example, I’ll show how to define a type for describing communicating concurrent systems which, by writing total functions, guarantees that concurrent programs will interact as intended.

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