The Problem with "dup" and "swap" in Stack-Based Languages | Lambda the Ultimate
Operations like "dup" and "swap" in stack-based languages are special in that they return multiple results (unlike most other languages which simulate multiple results by returning tuples). I find expressing the concept in a type system challenging (if anyone else has done it successfully I would definitely like to hear about it). One of the core problems is that the type of a function like eval,
The Essence of Concatenative Languages
Andreas Rossberg defined a concise and elegant type system for the concatenative language Cat created by Christopher Diggins that makes clear, once and for all, that the nature of the paradigm is solidly functional, point-free and higher order in a way that, as John Nowak remarks, goes beyond the original conception of Backus' FP. Here I wish to contribute to fixing these important ideas by presen
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