A phrase that I've noticed recently is the concept of "point free" style... First, there was this question, and also this one. Then, I discovered here they mention "Another topic that may be worth discussing is the authors' dislike of point free style." What is "point free" style? Can someone give a concise explanation? Does it have s...
Looks like R5RS language in DrScheme does not come with hashtable library.. when I run (make-hash-table) it throws an error... Pretty Big has support for hashtable but does not support mutable pairs.. so I am stuck making one of them work for me .. How do I add support for hashtable in R5RS? thanks ...
I have a List and want to reduce it to a single value (functional programming term "fold", Ruby term inject), like Arrays.asList("a", "b", "c") ... fold ... "a,b,c" As I am infected with functional programming ideas (Scala), I am looking for an easier/shorter way to code it than sb = new StringBuilder for ... { append ... } sb.toS...
I need to write a code snippet that would compare multiple arrays and produce the set that match the data in those arrays, produce the data set only in array A, but not in array B,C,D,in array B but not in A,C,D, being able to handle any number of arrays (i.e. dynamically looped). The code should utilize anonymous functions in Scala (i.e...
In functional programming, functions are regarded as entities, and can be passed around as objects are in an OO context. At some level, the function may be 'called' with some arguments. And I was wondering: is this, too, called Dependency Injection? And further: does this usage of DI result in Inversion of Control? ...
Possible Duplicates: typedef in C#? STL like containter typedef shortcut? I was wondering if there was an equivalent to Type aliasing from Functional Languages that I can use in C# For example in a nice functional language like Haskell I can say something like the following to alias an existing type to a custom Type Name typ...
I don't want this question to be too debatable. I've just finished my 2nd year of studying and kind of missed my chance to study functional programming (Haskell), and am wondering whether it really is worth spending large part of summer studying it or not. I will be working on a project over the summer that involves learning javascript ...
Are there any serious scientific math libraries made with functional programming languages? From the very nature of functional languages one would think that they are particularly suitable for math, but yet the well-known algorithms seem to be procedural. For instance, the classic Numerical Recipes series is written pretty much in proce...
I hope this is a valid post for these forums I am trying to revise for my functional programming exam, and am stumped on the first questions on past papers, and yes, we arent allowed solution sheets, here is an example of the 1st question on a past paper For each of the following expressions give its type in Haskell (for an expression...
I'm a little surprised that MATLAB doesn't have a Map function, so I hacked one together myself since it's something I can't live without. Is there a better version out there? Is there a somewhat-standard functional programming library for MATLAB out there that I'm missing? function results = map(f,list) % why doesn't MATLAB have a Ma...
I've written a small Scheme interpreter in C#, and realised that the way I had implemented it, it was very easy to add support for proper continuations. So I added them... but want to "prove" that they way that I've added them is correct. My Scheme interpreter however has no support for "mutating" state - everything is immutable. So i...
I wanted to make a lazy list in Scheme. This is what I have so far. ;; Constructor for Pairs (define (cons-stream a b) (cons a (λ() b))) ;; Selectors (define (car-stream a-stream) (car a-stream)) (define (cdr-stream a-stream) ((cdr a-stream))) ;; Lazy List using the pairs (define (lazy-list from) (cons-stream from (lazy-list ...
Hello Everyone, I'm working on a p2p app that uses hash trees. I am writing the hash tree construction functions (publ/4 and publ_top/4) but I can't see how to fix publ_top/4. I try to build a tree with publ/1: nivd:publ("file.txt"). prints hashes... ** exception error: no match of right hand side value [67324168] in function ...
I've been reading a bit lately about functional languages. Coming from 10+ years of OO development, I'm finding it difficult to get my head around how on earth one can point the pure functional approach (i.e. the same method called with the same parameters does the same thing) at a problem where typically (in an OO program) I would need ...
Dear gurus, I was recently thinking how I'm not always using the beautiful concepts of OO when writing Pythonic programs. In particular, I thought I'd be interested in seeing a language where I could write the typical web script as # Fictional language # This script's combined effect is to transform (Template, URI, Database) -> HTTP...
I've often heard that functional programming solves a lot of problems that are difficult in procedural/imperative programming. But I've also heard that it isn't great at some other problems that procedural programming is just naturally great at. Before I crack open my book on Haskell and dive into functional programming, I'd like at lea...
Are there some links to great resources for F# for: Beginners use. Examples in applying it to business and enterprise applications. What I meant by great is similar to the videos presented in the Learn section of ASP.NET and WindowsClient.net. Thanks. ...
For cultural and intellectual enrichment, I've decided to learn a bit of Haskell. I've been reading Hughes' "Why Functional Programming Matters" and am trying to translate its code into true Haskell. I've attached some of my attempt below (for the numerical parts of the paper; the alpha-beta algorithm is even more interesting but I'd als...
For a few days I've tried to wrap my head around the functional programming paradigm in Haskell. I've done this by reading tutorials and watching screencasts, but nothing really seems to stick. Now, in learning various imperative/OO languages (like C, Java, PHP), excercises have been a good way for me to go. But since I don't really know...
What languages are available that promote both object-oriented and functional programming? I know that any language that supports first-class functions can be considered functional, but I'm looking for a syntax that's specifically targeted for both coding styles. Using such a language, I'm imagining isolating all state changes to a sing...