F# is a succinct, expressive, and efficient functional and object-oriented language for .NET
2
votes
1answer
39 views
F# Active Pattern with Poker and Playing Cards
From this question and John Palmers answer about active pattern I discovered a gap in my knowledge about F# and took the challenge to code me into some level of understanding this technique.
The ...
4
votes
1answer
124 views
Reporting the highest satisfied poker hand in F#
I'm learning F# by doing various small projects. One of them is a problem where the program reads Poker hands and rates them. It's Texas Hold'Em, so for each player it tries every five card selection ...
3
votes
3answers
59 views
Printing a table
I have this recursive function that I made which prints a table, but I really think my current solution is really ugly. Does anyone have an idea as to how I can improve my solution?
I'm trying to ...
2
votes
2answers
92 views
F# Insertion sort
I made a simple insertion sort in F#, it uses a tail recursive shift function that attempts to shift an element in a list until it is in the right order. Would like ...
7
votes
3answers
124 views
Doing an ROP style bind for two functions on the same input in a pipeline
I am working on understanding Railway Oriented Programming (Scott Wlaschin style) in F#. In my example I want to create a pipeline which does some calculation, applies two different functions to the ...
4
votes
2answers
28 views
Implement total savings function on a record type
the TotalSavings() function on the record below has a code smell that I can't exactly detail. Is there a more readable alternative for implementing this function on a record type?
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6
votes
1answer
64 views
Streaming a Pin functionally(ish)
Earlier today I wrote a question (Validating a StreamingPin) and I thought it was a good idea (apparently I was the only one who thought so, but whatever), so I proceeded further with it and developed ...
14
votes
1answer
176 views
Grand Chess domain model and helper functions
So I am trying to write, essentially from a blank slate, a program that plays Grand Chess. In short, it is a chess variant that is played with two extra pieces, on a 10x10 board, no castling, and ...
5
votes
1answer
79 views
Battleship Game
Inspired by this question, I went on with the following version. My goal was to focus on pure functions, to avoid mutable variables and to be strictly functional.
I have ignored the computer player ...
3
votes
1answer
53 views
hl7 parser with fparsec
I have a little experience working with .hl7 data (format for transmitting health data), so I decided to try and write an .hl7 parser using fparsec.
A standard .hl7 segment is a single line with:
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11
votes
2answers
127 views
You can't sink me
Here is a Battlehips game in F#. Now, before you start jumping up and down on my code, please understand that, for all its awesomeness, F# has a serious limitation: Its compilation is linear, and the ...
1
vote
0answers
26 views
Simple Agent in F#
I wrote a simple agent system based on the agent type from Akka. It allows you to encapsulate a mutable state in a thread safe manner for use cases where mutation would be most convenient (like for ...
4
votes
1answer
53 views
Directory listing, sorting and filtering in F#
Here is my first try at F#. My only functional experience is from JS.
This program takes a path as an argument and presents the user with numbered subdirs in that path. The user then selects one of ...
12
votes
3answers
561 views
Return total balance from unsorted purchase items that may have specials
This is in reference to the following kata:
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2
votes
1answer
34 views
F# Simple Tree evaluation
I'm currently trying to learn the idiomatic way to write F# code. The code simulates a basic calculator with only binary plus, minus and unary minus.
I'd like to know if there is a better way to ...
6
votes
1answer
72 views
Unit test for allowable checkers moves
Is pattern matching within a unit test a code smell?
Do I really need to throw an exception just for my test to fail if the function under test receives invalid arguments (i.e. not Succeeded case ...
1
vote
1answer
45 views
Idiomatic F# unit test using xunit and unquote
I'm writing some unit tests for testing C# code but I'm using F# and Unquote for the first time for the unit tests and would like some input as to how I might make the tests more 'f-sharpier' to take ...
7
votes
2answers
75 views
Checkers moves using union types
How do I refactor common code with different union types?
I'm still struggling with refactoring F# code with different types but same behavior.
I have the following function that I would like to ...
6
votes
1answer
59 views
TCPListener server to discover clients on a network
I am currently writing a program to sync files (music, photos, etc) from my PC to an Android device. In order to do this, I have 2 application: one that is running on my PC, and one that shall be ...
6
votes
1answer
103 views
Card combination finder in F#
I have been adding and tinkering a bit with the code from my Baloot tally finder. I updated the code a bit and factored a new things, but for this post I am trying different stuff: to detect whether ...
5
votes
1answer
52 views
Async.sequence implementation
I have a simple implementation for "Async.sequence" (the name came from here), but I would like someone to review it for performance, tail call optimization, and ...
5
votes
1answer
67 views
Recursively traverse directory tree and print all files
I want to build a small console program, that for given directory, will print (for now) all files inside that tree.
Here is an F# script that I came up with:
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4
votes
2answers
75 views
F# function to concatenate some DSL scripts with indentation
I'm rather new to F# and functional programming. I wrote the following method to concatenate some custom dsl scripts. The function works are expected without errors. I wanted to know if there was a ...
6
votes
2answers
126 views
Recursive implementation of a zip function in F#
I'm learning F# from Tomas Petricek's "Real-World Functional Programming" book. As suggested at one point in the book, I started implementing a zip function using a ...
6
votes
1answer
55 views
Tally Calculator for Baloot in F#
This is a tally calculator for the Saudi card game Baloot. As in, they're a set of functions so that the user would provide their winnings at the end of a round (card captured, projects declared, etc) ...
4
votes
1answer
65 views
Divide number by factors
I'm learning F#.
The code below gets a number e.g. 100 and list of factors and should divide that number by the factors without any rest. (There is an actual code I've got in C#, but this is F# port).
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2
votes
1answer
161 views
K-Means Clustering - F# Learning Challenge
Inspired by this blog I went on implementing my own version as a F# learning challenge. It turned out to be quite different than the original (but somewhat faster for large samples).
The first code ...
3
votes
1answer
55 views
IsImageUrl extension method written in F#
I'm a newbie to F# and so I've written a small extension method library to practice the language. The extension method attempts to determine if a url string is for an image. I wrote the code as an ...
9
votes
4answers
142 views
Swap even/odd characters
I wrote some code to solve this problem https://www.hackerrank.com/challenges/string-o-permute which basically states: take an even length string and swap all the even indexed characters. For example ...
4
votes
1answer
71 views
Get a stock quote from a web page using F#
I want to extract a price for a single index fund, the price of which is available on dynamic web pages.
Being new to this, my original idea was to download the single page of static HTML and get ...
4
votes
2answers
535 views
Web crawler in F#
I have been writing a web crawler in F# that downloads pages with stylesheets and scripts.
Can somebody give me suggestions on improving this code, please?
Would appreciate any feedback that could ...
1
vote
1answer
67 views
NFA and DFA implementation
Can you review my F# code and point out some insights about it?
What I want to know, in order of relevance:
Avoid so much common code between DFA and NFA. I want to make something more generic, ...
2
votes
1answer
245 views
Transforming XML to HTML with XSLT
I'm still learning from designing with types non strings by Scott Wlaschin.
For my project I transform some XML to HTML with xslt.
Because every filename can have side effects, they are stored in ...
6
votes
1answer
110 views
My Brainfuck interpreter in F#
I'm very new to functional world. I've written a simple brainfuck interpreter as my first F# program.
What I would like to know:
Am I using the right data structure for each situation?
Is my code ...
3
votes
1answer
61 views
Compare performance of simple addition on one to many cores
I read recently that ENIAC originally was capable of 5000 additions per second. Naturally, I had to test my own laptop's capabilities and this became an instructive experiment in F#, which I suck at.
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1
vote
0answers
34 views
F# logging agent with mailboxprocessor
I'm still learning F# and have written this logger agent I want to use in a project.
How is the coding style? Especially the part with MailboxProcessor.Start ... ...
7
votes
2answers
105 views
Console input prompt loop in F#
I'm learning F#, starting with baby steps. Is there a way to write this code in a more succint way, while keeping the same semantics? Maybe by using a Seq or ...
2
votes
1answer
165 views
Parsing .PLY file using F#
I'm fairly new to F# and have written a program to parse PLY files - this is however done in an imperative way with mutable values and as far as I know that should be avoided in functional languages.
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4
votes
2answers
48 views
Breaking lists into subgroups in F#
I'm starting to play with F# to do some data parsing and I was able to create a function to group an array of string into sub groups. The code looks like this:
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5
votes
1answer
391 views
Anagram finder in F#
I've been learning F# for a month or so and I'm wondering how good my "functional" aspect of coding is. When I first started, I did this using an iterative approach with a lot of <- and mutables ...
4
votes
0answers
51 views
SqlDataConnection update method
I'm using Microsoft's SqlDataConnection type provider. However, the only way I've seen to update a row in the database is to use something similar to this where it updates mutable values:
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3
votes
2answers
170 views
Heightmap generation using midpoint displacement
I am writing a program to generate a height map following the midpoint displacement algorithm (somewhat similar to diamond-square).
I'm at the point where I have a recursive program that paints the ...
2
votes
0answers
70 views
Blocking Memory Queue
This is a FIFO blocking memory queue in F# to be used as a component in a logging library.
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8
votes
2answers
121 views
Unit testing F# code without using an existing test library (MSTest, xUnit, etc.)
I know I can probably use MSTest (I'm under Linux without an IDE so maybe not?) or another unit testing library, but for a small project I decided to write my own unit tests without resorting to a ...
0
votes
1answer
30 views
Converting height map bitmap to json
This is my first F# program.
It's a command line utility that takes a parameter containing a path to an height map bitmap and prints out this height map converted to JSON format.
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4
votes
1answer
99 views
FizzBuzzWoof in F#
I'm learning F#, and have challenged myself to write a good functional implementation of FizzBuzzWoof. (The difference from "standard" FizzBuzz is that any number that either is divisible by or ...
5
votes
2answers
166 views
Dijkstra algorithm implementation in F#
I'm trying to implement Dijkstra algorithm in F# for finding the shortest path in a undirected tree using a heap.
I've used the type PriorityQueue found here and the code can be found here.
...
1
vote
0answers
59 views
F# Cache manager
This is a port of a C# cache manager we use to F#, this is my first F# code, and I've tried to make it as idiomatic as possible. I would appreciate input on style, performance considerations,...
3
votes
1answer
107 views
Factory pattern in F# for a web scraper
I'm trying to learn F# by creating a little web scraper that will do custom scraping based on the url domain. For this, I need to create and select the correct kind of scraper. I figure I would use a ...
3
votes
1answer
128 views
Project Euler Q7 - 10001st prime
The problem is (source)...
By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13.
What is the 10001st prime number?
This is my second attempt at ...
