Implementation of Term Rewriting-Based Programming

Nadia Nedjah

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It is important to understand how the event queue can be used and the role that it plays as an intermediary between event producers and event handlers. In the previous example, we have (implicitly) represented the integer n by the function that acts like the identity but with the side effect of printing n asterisks. The code demonstrates many of major functional concepts: immutability, lambdas, monads, combinators, pure functions, declarative code design.

Adapting Proofs-as-Programs: The Curry--Howard Protocol

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In this blog post we’ll be building a Socket. It does not have to spend a lot of time figuring out whether things happen or deciding what has happened and who should deal with it. (Of course, event-driven code relies on an event dispatcher, which does have to deal with these things, but often either one is available -- as in the GUI case -- or a fairly simple and generic one will do.) A second advantage of the event-driven style is that, when used in concert with an event queue (as in Java's AWT), it separates the generator of the event (e.g., the window motion) from the handler of the event (the component that is uncovered).

Applied Nonlinear Analysis

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Static typesystems do not replace live programming. There is an informal correspondence between Haskell programs and certain classes of categories, which can be made more formal with some work. He has a screenshot of Task Manager running on a 128-core machine which apparently exists in Redmond (I can’t quite read the figure for total RAM but think it may be 128GB): Hejlsberg says there was a language doldrums between 1995 and 2005, when many assumed that Java was the be-all and end-all. The following code gets the invocation list of multicast delegate action and for each delegate in the invocation list outputs the name of the method: Beside the name, you can get other parameters of the function such as return type, arguments, and you can even explicitly call some delegates in the invocation list.

The Golden Ticket: P, NP, and the Search for the Impossible

Lance Fortnow

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Since patent examiners rely so much on keyword searches, when you submit your application, if you can change some of the keywords in your patent to be different than the words used everywhere else, you might get your patent through even when there’s blatant prior art, because by using weird, made-up words for things, you’ve made that prior art harder to find. C++ is like an oil tanker — it takes a long time for it to change course.

Realm of Racket: Learn to Program, One Game at a Time!

Matthias Felleisen

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At the start, the program is in a certain state, and the computer is given steps to follow, in order to perform an action. One needs to look at the mailing lists to realize that the language is still being actively developed. It's like saying, "I want to learn what's so neat about Object-Oriented Programming. I have found people can be resistant to ideas like this. COMPOJURE_DIR=path-to-compojure-dir COMPOJURE_JAR=$COMPOJURE_DIR/compojure.jar CP=$CP:$COMPOJURE_JAR for file in $COMPOJURE_DIR/deps/*.jar do CP=$CP:$file done Here's an example of a simple Compojure web application. (ns com.ociweb.hello (:use compojure)) (def host "localhost") (def port 8080) (def in-path "/hello") (def out-path "/hello-out") (defn html-doc "generates well-formed HTML for a given title and body content" [title & body] (html (doctype :html4) [:html [:head [:title title]] [:body body]])); Creates HTML for input form. (def hello-in (html-doc "Hello In" (form-to [:post out-path] "Name: " (text-field {:size 10} :name "World") [:br] (reset-button "Reset") (submit-button "Greet")))); Creates HTML for result message. (defn hello-out [name] (html-doc "Hello Out" [:h1 "Hello, " name "!"])) (defroutes hello-service; The following three lines map HTTP methods; and URL patterns to response HTML. (GET in-path hello-in) (POST out-path (hello-out (params :name))) (ANY "*" (page-not-found))); displays ./public/404.html by default (println (str "browse http://" host ":" port in-path)); -> browse http://localhost:8080/hello (run-server {:port port} "/*" (servlet hello-service)) The jdbc library in Clojure Contrib simplifies accessing relational databases.

Hypergeometric Summation: An Algorithmic Approach to

Wolfram Koepf

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This condition stems from the fact that the paths returned by extendToFinal are constructed by operation extendPath which, through condition noCycle, fails to insert a state in a path that already contains that state. I unfortunately could not find a clean way to represent this as a generic solution. At the end of the day, all the computer does is calculate some quantities. We can tell this is a high order function because it produces a new function. If we examine what is being done from left to right, the program is easy to understand (at least until we get to the anonymous delegate).

Getting Started with MuPAD

Miroslaw Majewski

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But it isn’t free: somewhere else there is a mass of code that supports your brevity. Later versions of Lisp such as Scheme and variants of APL did provide full functional support. Computation is therefore simply a question of translating inputs and outputs from one system to another." We’ve got connections, an EventStream with one event per Socket. And yet the set of people who have read it remains small relative to those who know of it and could potentially read it.

The Concrete Tetrahedron: Symbolic Sums, Recurrence

Manuel Kauers

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When they introduced Swift, I was amazed and immediately downloaded the eBook. Arrogance is an enemy of knowledge because it deludes a person into thinking they know it all. Currying is a method that enables you to break an N-argument function to N single argument calls. In particular, if you pass an rvalue Stream to forEach, its elements will be generated and deleted in lockstep. The strsplit automatically vectorises this operation to perform this element-wise.

Implementation of Functional Languages: 14th International

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Visit codemesh.io to register and submit your talk. What’s most interesting about this bit of code is that you’re using a chain of functions to derive a new function, similar to how you use chains of functions to derive new data. I studied a lot of programming language theory for my degree, so it was more like a refresher?, but the constant switching between C# and F# to demonstrate the concepts was brilliant.

Advanced Functional Programming: 5th International School,

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The course takes two weeks, with 4 hours of lecturing per day. Every function has its own workspace PER CALL of the function. There is another reason to prefer this approach. Since the implementation is not specified, the compiler can more easily optimise your code; you do not care provided the result is correct. There are smart, founder-friendly VCs out there. There's a subtle distinction there: the question isn't "why don't people learn about functional programming?", but more along the lines of "why don't they use it, directly and obviously, in more everyday projects?"