OCaml Datatypes CSI 3120 Amy Felty University of Ottawa slides copyright 2017, 2018 David Walker, Amy Felty permission granted to reuse these slides for non-commercial educational purposes 2 OCaml So Far • We have seen a number of basic types: – int – float – char – string – bool • We have seen a […]
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INTRODUCTION TO OCAML slides copyright 2017, 2018 David Walker, Amy Felty 1 permission granted to reuse these slides for non-commercial educational purposes Alonzo Church, 1903-1995 Princeton Professor, 1929-1967 In 1936, Alonzo Church invented the lambda calculus. He called it a logic, but it was a language of pure functions — the world’s first programming language.
For a short humorous talk on languages without strong typing: https://www.destroyallsoftware.com/talks/wat [Broader point: No one (few people) knows what their programs do in untyped languages.] 1 Type Checking Basics CSI 3120 Amy Felty University of Ottawa slides copyright 2017, 2018 David Walker, Amy Felty permission granted to reuse these slides for non-commercial educational purposes 2
Fundamentals Mitchell Chapter 4 Syntax and Semantics of Programs “…theoretical frameworks have had an impact on the design of programming languages and can be used to identify problem areas in programming languages.” • Syntax – Thesymbolsusedtowriteaprogram • Semantics – Theactionsthatoccurwhenaprogramisexecuted • Programming language implementation – Syntax®Semantics – Transformprogramsyntaxintomachineinstructionsthatcanbe executed to cause the correct sequence of
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Automata, Computability and Complexity: Theory and Applications Elaine Rich Originally published in 2007 by Pearson Education, Inc. © Elaine Rich With minor revisions, July, 2019. Table of Contents PREFACE ………………………………………………………………………………………………………………………………..VIII ACKNOWLEDGEMENTS…………………………………………………………………………………………………………….XI CREDITS…………………………………………………………………………………………………………………………………..XII PARTI: INTRODUCTION…………………………………………………………………………………………………………….1 1 2 3 4 Why Study the Theory of Computation? ……………………………………………………………………………………………2 1.1 The Shelf Life of Programming Tools ………………………………………………………………………………………………2 1.2 Applications
Functional Programming and Scheme CMPSC 461 Programming Language Concepts Penn State University Fall 2020 Higher-Order Functions In Scheme, function is a first-class value (Functions can go wherever expressions go) • Higher Order Functions • Function can be used as an argument • Function can be used as a return value 2 Examples w/o Higher-Order Functions
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CSSE 304 Day 13 Your questions on Exam 1? Lexical Address examples Computation in the lambda Calculus \reverse and reverse! Syntactic extensions 1 Interlude lexical address solution (lexical-address ‘((lambda (x y) (((lambda (z) (lambda (w y) (+ x z w y))) (list w x y z)) (+ x y z))) (y z))) ((lambda (x
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CSSE 304 Day 11 Your list-recur examples Lambda Calculus syntax Free and Bound Variables (if time) Lexical address Student Questions? path-to solution • Notice that I avoided using append 1 list-recur abstracts list recursion • From last time: Try to come up with at least one other procedure that is easy to write using list-recur.
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CSSE 304 Day 15 Aggregate datatypes define-datatype Parsing lambda-calculus expressions Lambda-calculus and combinators Prelude:Creating Wicked Students • Thisisatitleofa2018bookbyPaulHanstedtthatthe Faculty Book Clubs on campus discussed Winter 2018-19. • FromPage41: – If we want to create students who can go off on their own and respond thoughtfully to wicked problems, the best way to do that is
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CSSE 304 Day 14 More define-syntax examples Re-introduction to datatypes Standard aggregate datatypes define-datatype (Parsing lambda-calculus expressions) lexical address hint (lexical-address ‘((lambda (x y) (((lambda (z) (lambda (w y) (+ x z w y))) (list w x y z)) (+ x y z))) (y z))) Recursive helper should take an additional argument, a “lexical environment”
程序代写代做代考 data structure Lambda Calculus CSSE 304 Day 14 Read More »