F# is a succinct, expressive and efficient functional and object-oriented language for .NET

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1answer
19 views

Tail-recursive query string builder in F#

I have a situation where I'm generating a URL based on a set of query string parameters for use in an API. I know ahead of time that the values passed to this function are URL-safe and the tuples are ...
6
votes
1answer
105 views

Good usage of MailboxProcessor/Agent in class rather than mutable field?

I've written a simple Simple Service Discovery Protocol (SSDP) module. This module contains a class, Session that you create and then use to issue commands and ...
4
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0answers
47 views

Refactoring while-do array comparison function into tail recursion with F#

As part 2 of my other question concerning this long running project I've been inquiring about on CR, I reimplemented my generic function for determining if an array of arrays is a sub-array or ...
2
votes
1answer
45 views

Refactoring while-do into tail recursion with F#

I have a while-do loop nested inside a while-do loop in my program, due to it needing to iterate in two dimensions through an array of arrays, and originally my loop looked like this: ...
6
votes
2answers
130 views

Functional Programming style in F#

I'm normally a C# OO developer, but I've started to learn F# and I want to make sure I'm writing code in a functional way and in a way that suits the language. I've quickly pieced this together with ...
6
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2answers
74 views

Discount curve from instant rate

This my first foray in F#, and I cannot think (yet) functional. I have implemented an interface for a discount curve and the implementation for a piecewise constant instant rate implementation. I ...
3
votes
1answer
91 views

Locating a bitmap inside another (larger) bitmap with F#

This is my firstish (heavily rewritten) go at the completed project that I've been working on with CodeReview assistance, so further advice is appreciated! See here, here and here for the past history ...
2
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2answers
44 views

Replacing an F# loop over a mutable variable by an immutable approach

Consider: let mutable m' = m while m' % i = 0L do m' <- m' / i I've refactored it into: ...
4
votes
1answer
51 views

Transform Bitmap object into jagged array of RGB tuple values

I've been working on this module with the assistance of codereview, and based on the responses and my own research, this is my project so far. The goal behind the code is that it starts with a .NET ...
9
votes
1answer
79 views

Ugly Numbers: A Rags-to-Riches Story

I stumbled upon an unaswered question, which looked like a good fit for a functional programming language. Here is the problem statement from codeeval: UGLY NUMBERS CHALLENGE DESCRIPTION: ...
5
votes
1answer
130 views

Generating the pretty bit at the end of a URL

I'm having a dip into F# and am attempting not to write it like it's C#. One area that bothers me is using members of System.String. These often need to be chained ...
3
votes
1answer
52 views

Transforming a byte array into an array of byte arrays with F#

This code is intended to be used with an image manipulation library that I'm working on, and the goal is to take the raw byte[] data from an image, and transform it into a 2D array where each position ...
1
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1answer
40 views

Load bitmap object data into array of byte values

I'm building this as part of a larger class to rapidly search for smaller images inside larger images. This is my first serious F# project so comments especially concerning style and organization are ...
4
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1answer
78 views

A functional binary heap implementation

I've implemented a binary heap in F#. It's pure and uses zippers for tree modification. To test it out I have implemented heap sort using it but it takes 10 seconds to sort a list of 100 000. Regular ...
4
votes
0answers
60 views

Fibonacci number function: convert to tail-recursion?

I've been implementing a function for calculating the nth Fibonacci number in F#. So far the best implementation I could come up with is this: ...
3
votes
1answer
100 views

Parsing sections from a log file using F#

After reading a lot about F#, I am today cutting my very first real life F# code and I'd appreciate any feedback on my approach. I'm writing a simple utility to analyse a log file. The code below ...
2
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2answers
89 views

Defining a zip code string

I'm following this ...
3
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0answers
43 views

Retrieve records from the database based on a possible id

This code will retrieve all records from the database if the id is null or return records by the available id. Is there a way to combine the query instead of having two separate queries? ...
3
votes
0answers
40 views

Check the database for an order number

This code will check the database for an order number. If none exist it creates one. If one does exist then it will increment it by one and update the database. Is this the most efficient way to ...
4
votes
2answers
104 views

Making backtracking Sudoku solver more functional

I'm implementing the backtracking solving algorithm for a Sudoku in F#. I'm wondering if I could make my code better respect the functional programming paradigm or even just making it simpler/better. ...
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0answers
83 views

Traffic Flow functional way

The same problem, but f# instead c#: ...
1
vote
1answer
81 views

SalesTax problem

The same problem, but I decided to do it using F#: ...
2
votes
1answer
67 views

Organizing types/namespaces within tree

I'm working on a parsing engine as part of a personal project, and I'd like to expose certain .NET APIs to the parsed environment. I put together a very simple tagged union that allowed me to nest ...
1
vote
1answer
101 views

Is this use of ConcurrentDictionary truly thread safe?

I'm working on some teaching examples showing the perils of accessing the Dictionary class concurrently. In the code below each function is designed to do a word count across a number of files. ...
2
votes
2answers
155 views

Check database for item and create it if it doesn't exist

Is there a more efficient approach to this code? ...
2
votes
0answers
68 views

Polling, parsing, validating and handling data cleanly and efficiently

<edit: There's a major problem in the code. It is basically the one in the comment regarding backpressure. I'll rework the code within a a few days... It's time for a quick code review, good ...
2
votes
2answers
93 views

A concurrency-safe stack structure

This is a teaching sample intended to illustrate use of mutability and list consing in F#. The structure is intended to be a thread-safe stack structure, which multiple threads can push to/pop from ...
4
votes
1answer
43 views

Server code to save uploaded files

This code basically saves an uploaded file to the server. I am wondering if there is anything that I can do to tighten this code up. I am very new to F# so I'm still having trouble breaking away ...
3
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1answer
134 views

NinjectWebCommon implementation/translation - C# to F#

I've translated this code from c# and would like it to be more idiomatic f#: ...
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1answer
121 views

Basic templating engine in F# using F# syntax

I've been working on a rough idea for a templating engine (mostly as a learning project) using the F# syntax. How "correct" is my code in terms of being idiomatic F#? Are there F# features which would ...
6
votes
4answers
216 views

Splitting a sequence into equal segments

I need to split up a sequence into equal segments of a given size (yes, the last one may be shorter), and I'm trying to find an efficient and idiomatic way to do it. I have two versions of the ...
14
votes
2answers
619 views

First real-world F# application - how “good”/idiomatic is it? (long!)

After reading/watching various introductions and blog posts and some code here and there, doing a bit of the Try F# tutorial and starting to read "Real World Functional Programming", I felt I should ...
3
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0answers
111 views

Simple RabbitMQ client wrapper

After reading this question, I've realized that I can do a lot to improve the quality of my question, so I've edited this question quite a bit. I've been teaching myself F# in my spare time off and ...
7
votes
3answers
193 views

Poker Hands Kata in F#

I'm a F# newbie, and would like to share my implementation of the Poker Hands Kata problem to get some feedback. ...
7
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1answer
174 views

Hierarchical State Machine in F#

I appreciate any feedback on where I might alter or improve my code for this project. This is an old attempt at implementing a Hierarchical State Machine in F#. I'm from a C#/OO background mostly. ...
2
votes
1answer
115 views

Is this a good use of Async in F#?

I've hacked together some code to read the content from a sequence of files: ...
4
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0answers
168 views

F# and Rx code that throttles; can it be done without ref cells (and possibly with active patterns)?

I'm basically redoing a piece of reactive C# code posted in SO code in F#, please, see below. The translation is fairly literal, I've just written the infinite loop as a recursive function and ...
5
votes
1answer
114 views

Read text from stream char by char

I've started learning F# and functional programming in general, but the code I wrote doesn't seems to be really functional. Could you take a look and say how to make it more as it should be in ...
6
votes
4answers
291 views

Functional approach to splitting list into sub lists

Here is my functional approach to split a list into sub lists, each having non-decreasing numbers, so the input \$[1; 2; 3; 2; 4; 1; 5;]\$ computes to \$[[1; 2; 3]; [2; 4]; [1; 5]]\$ The code ...
6
votes
1answer
256 views

Reading input from the console in F#

In the process of learning F#, I wrote this code that reads lines of input from the console and stores them in a list. As far as I can tell the code works correctly, but since I'm new to functional ...
4
votes
2answers
119 views

F# rectangle packing algorithm

I would appreciate it if someone experienced in F# and/or functional programming to look over my code. This is practically the first thing I wrote in the language so I'm sure it's filled with ...
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0answers
139 views

Review my F# Red Black Tree Implementation [closed]

I have written this implementation for red black tree. I also have some helper methods to verify whether the generated tree is really balanced or not. Looks good to me.... but I find that most of the ...
1
vote
1answer
146 views

Review my F# QuickSort Program

OK... last sort of the day and probably the most fun. F# is really awesome. ...
1
vote
1answer
135 views

Merge Sort Program

I have written the following program to implement merge sort in F#. Can you please review this and let me know how can I write this in the most functional way (also most efficient and concise)? In ...
1
vote
2answers
68 views

Review my F# BubbleSort Program

I have written this code for BubbleSort in F#. Can you review and let me know how I can do this in most functional way. ...
4
votes
2answers
50 views

InsertSort F# program

I have written this InsertSort program in F#. It works, but I am not very happy with it. ...
2
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1answer
73 views

Using types in F#

I've played with F# for over a year, but I've only recently begun tentatively using it for professional work. I'm concerned that my c-style OOP principles are blinding me to the advantages of a ...
4
votes
3answers
149 views

Improving F# conditional assignment with match expression

In my code I declared a dictionary to store various counters let counters = Dictionary<Type, int>() Later, I need to generate several labels using these ...
2
votes
1answer
96 views

parallel.For function

I am trying to add parallelism. The following function works. For testing purposes, calculating chunckLength is fine. However, when I allocate more cores, it seems ...