Mutation CSI 3120 Amy Felty University of Ottawa slides copyright 2017, 2018, 2019, 2020 Author David Walker, updated by Amy Felty permission granted to reuse these slides for non-commercial educational purposes mutable set immutable set Reasoning about Mutable State is Hard insert i s1; f x; member i s1 let s1 = insert i s0 […]
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Thinking Inductively CSI 3120 Amy Felty University of Ottawa slides copyright 2017, 2018, 2019, 2020 Author David Walker, updated by Amy Felty permission granted to reuse these slides for non-commercial educational purposes 2 Options A value v has type t option if it is either: – the value None, or – a value Some v’,
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Modules and Abstract Data Types CSI 3120 Amy Felty University of Ottawa slides copyright 2017, 2018, 2019, 2020 Author David Walker, updated by Amy Felty permission granted to reuse these slides for non-commercial educational purposes The Reality of Development We rarely know the right algorithms or the right data structures when we start a design
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INTRODUCTION TO OCAML slides copyright 2017, 2018, 2019, 2020 Author David Walker, updated by Amy Felty 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
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, 2019, 2020 Author David Walker, updated by Amy Felty permission granted to reuse these slides
OCaml Datatypes CSI 3120 Amy Felty University of Ottawa slides copyright 2017, 2018, 2019, 2020 Author David Walker, updated by 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
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Polymorphic Higher-Order Programming CSI 3120 Amy Felty University of Ottawa slides copyright 2017, 2018, 2019, 2020 Author David Walker, updated by Amy Felty permission granted to reuse these slides for non-commercial educational purposes Some Design & Coding Rules • Laziness can be a really good force in design. • Never write the same code twice.
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Using Zoom for Lectures • Please mute both: • yourvideocamerasfortheentirelecture • youraudio/micsunlessaskingoransweringaquestion • Recommended Zoom configuration: • notfullscreen(double-clickanywheretoexitfullscreen) • side-by-side mode (see View options near the top of Zoom) • Asking/answering a question, option 1: • clickonParticipants • usethehandicontoraiseyourhand • Iwillcallonyouandaskyoutounmuteyourself • Asking/answering a question, option 2: • clickonChat • typeyourquestion,andIwillanswerit CS 320 : Operational
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CS 320 : Functional Programming in Ocaml (based on slides from David Walker, Princeton, Lukasz Ziarek, Buffalo and myself.) Marco Gaboardi MSC 116 gaboardi@bu.edu Announcements You should be able to use GradeScope now. If you have some difficulty with submitting your homework to GradeScope, send a message to Piazza in which you describe the
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CS 320 : Functional Programming in Ocaml (based on slides from David Walker, Princeton, Lukasz Ziarek, Buffalo and myself.) Marco Gaboardi MSC 116 gaboardi@bu.edu What is a Functional Language A functional language: • defines programs in a way similar to the one we useto define mathematical functions, • avoids the use of mutable states (states
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