PPT-the IO Monad

Comp150PLD Reading Tackling the Awkward Squad Sections 12 Real World Haskell Chapter 7 IO Thanks to Simon Peyton Jones for many of these slides Beauty Functional programming is beautiful. Ho ev er if one go es further and uses con ersion to pro equiv alence of programs then gross simpli57356cation is in tro duced programs are iden ti57356ed with total functions from values to values that ma jeopardise the applicabilit of theoretical Computations . into Components. via Arrows as Profunctors. Kazuyuki . Asada Ichiro Hasuo. RIMS,. . Kyoto University. PRESTO . Research Promotion Program, Japan Science and Technology . Agency. A monad orders . actions. An action is any computation that has a natural notion of order. I.e. one thing happens before another.. IO is the action of altering the real world.. There are many other styles of computation that have a natural notion of order. Douglas . Crockford. Functional Programming. Programming with functions.. FORTRAN II (1958). FUNCTION . name. (. parameter. s. ). COMMON .... name. = . expression. RETURN. END. First Class Functions. i. -Languages. Paul M. Pietroski, University of Maryland. Dept. of Linguistics, Dept. of Philosophy. Human Languages . . acquirable by normal human children . given ordinary courses of experience. A monad orders . actions. An action is any computation that has a natural notion of order. I.e. one thing happens before another.. IO is the action of altering the real world.. There are many other styles of computation that have a natural notion of order. COMP150PLD. Reading: . “. Monads for functional programming. ”. Sections 1-3. “. Real World Haskell. ”, Chapter 14: Monads. Thanks to. Andrew . Tolmach. and Simon Peyton Jones for some of . at Scale, at Facebook. Simon Marlow. May 2015. Headlines. Right now there are thousands of multicore machines running Haskell 24/7 at Facebook. Haskell is a key part of the anti-abuse infrastructure. Douglas . Crockford. Today. Monads. Managing . Asynchronicity. Syntaxation. Principles of Security. Go To There and Back Again. Quality. Functional Programming. Programming with functions.. FORTRAN II (1958). Supplemental material – . not on exam. Lambda Calculus. From . wikipedia. Lambda calculus (also written as λ-calculus) . is a formal system in mathematical logic and computer science for expressing computation based on function abstraction and application using variable binding and substitution. Programming. Tim . Sheard. . . Monads . part 2. Monads and Interpreters. Small languages. Many programs and systems can be though of as interpreters for “small languages”. Examples:. Yacc – parser generators. Crockford. Today. Monads. Managing . Asynchronicity. Syntaxation. Principles of Security. Go To There and Back Again. Quality. Functional Programming. Programming with functions.. FORTRAN II (1958). FUNCTION . cs242. Reading: “. Tackling the Awkward Squad. ,. ” Sections 1-2. “. Real World Haskell. ,” Chapter 7: I/O. Thanks to Simon Peyton Jones for. many of . these slides. . Announcements. Midterm. Concurrency. First class functions. Generic programming. Memory Management (move semantics). Math nomenclature. Functor. Applicative Functor. Monad. Monoid. Functional Patterns in C . Sorting: compare function.