— Functional parsing library from chapter 13 of Programming in Haskell, — Graham Hutton, Cambridge University Press, 2016. module Parsing (module Parsing, module Control.Applicative) where import Control.Applicative import Data.Char — Basic definitions newtype Parser a = P (String -> [(a,String)]) parse :: Parser a -> String -> [(a,String)] parse (P p) inp = p inp […]
# Recursive Functions These notes should be read in conjunction with chapter 6 of our textbook Programming in Haskell. * We discuss some examples from the [Haskell’98 standard prelude](https://www.haskell.org/onlinereport/standard-prelude.html) for pedagogical purposes. * See the [prelude for the current version of the language](https://hackage.haskell.org/package/base-4.12.0.0/docs/Prelude.html) for all predefined classes and their instances. ## Basic Concepts There is
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# Types in Programming, types in Haskell ## Introduction The topic is introduced in the (https://bham.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=3d391440-24b8-4772-a8f0-adab008c58f5) on Canvas. ## Why are types useful? The purpose of types in programming languages is to **disallow** certain programmes. Specifically, types ensure that we only feed those arguments to a function that the function was designed to handle. For
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# Unbeatable tic-tac-toe They have the material on trees from [Data1](Data1.md) and [Data2](Data2.md) as a prerequisite. “` | O | O —+—+— O | X | O —+—+— X | X | X “` The first part of this handout is code from chapter 11 of our adopted book [Programming in Haskell](http://www.cs.nott.ac.uk/~pszgmh/pih.html), 2nd edition, by
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interpreter tweaks mhe authored 1 hour ago Interpreter.md 9.84 KB Interpreter module Interpreter where import AbstractSyntax We explain how to run programs written in abstract syntax: | initial | storage v final program tree +——-+——–+ storage ——————–>| run | ——–> (AbstractSyntax.hs) +—————-+ Representation of the storage There are several ways to represent the storage: 1.
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# Parser A video on this section can be found [here](https://bham.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=2b11842f-958c-48c6-bf16-ac85012ed0f0). Recall our concrete syntax in BNF notation: “` Program ::= Identifier := Expr; — assignment | { [Program] } — block | while (Expr) Program — whileStatement | If (Expr) Program — ifStatement | If (Expr) Program else Program Expr ::= Expr1 | Expr1
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# Functions in Haskell * Read also Chapter 4 of the text book “Programming in Haskell. ## Overview In this lesson, we study various ways how functions can be defined in Haskell. We will study the following ways: 1. Composition of existing functions 2. Conditionals (`if _ then _ else _ `) 3. Guarded equations
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# User defined data types – part 2 # Videos The following videos are also linked at appropriate points of this handout for your convenience. * [Binary search trees](https://bham.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=6df57013-8d6c-428f-aa91-ac6200cb487f) (27min). * [Rose trees](https://bham.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=19dd5944-85a9-4513-bd10-ac6200e5cc73) (13min). * [Game trees](https://bham.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=369be201-6656-4702-a221-ac6200e86be3) (6min). * [Permutation trees](https://bham.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=f90ddf8c-9d5f-4be6-88f5-ac6200efc923) (25min). * [Expression trees](https://bham.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=5a578db9-e6bd-486b-9ab4-ac6200f3a2b2) (13min). Total time 1:24. # Contents * [Binary search trees](#bsts)
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# Lazy natural numbers We introduce the lazy natural numbers, with a sample application to make a certain algorithm faster. ## Motivating example If the list `xs` is large, the following is slow. Moreover, it loops without giving an answer if the list `xs` is infinite: “`haskell checkLengthBiggerThan :: [a] -> Int -> Bool checkLengthBiggerThan
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# Higher-order Functions These notes should be read in conjunction with chapter 7 – Higher-order functions of our textbook Programming in Haskell. * We discuss some examples from the [Haskell’98 standard prelude](https://www.haskell.org/onlinereport/standard-prelude.html) for pedagogical purposes. * See the [prelude for the current version of the language](https://hackage.haskell.org/package/base-4.12.0.0/docs/Prelude.html) for all predefined classes and their instances. ## Note:
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