Questions tagged [f#]
F# is a succinct, expressive, and efficient functional and object-oriented language for .NET
352
questions
3
votes
0answers
109 views
Concurrency using immutability
I was watching the following video about software transactional memory(using a package that maintains an access log). At the moment I am trying to learn about concurrency with shared memory and ...
1
vote
0answers
223 views
Is This F# Recursive Example Tail Recursive?
I have a payment/lockbox file archiving utility that is called several times per day and with different parameters depending on the files that need archiving.
I know I can flatten ...
2
votes
2answers
51 views
Minimise function with single minimum and no maximums
I'm learning F#. I wrote a function to minimise a function with a single minimum and no maximums. At the bottom I test it on Math.Cos.
What do you think? I've wrote it pretty much as I would in an ...
4
votes
1answer
274 views
Counting letter frequencies from an input file
Out of pure curiosity, I decided to create a short F# script to calculate the letter frequencies based on the input file. Everything works smoothly and as I would expect. My questions regarding my ...
0
votes
1answer
45 views
Questions on F#'s loop and cont [closed]
The following tail-recursion example is taken verbatim from Chris Smith's Programming F# 3.0. If this is not the appropriate forum for this post, I will gladly move the post to the appropriate place. ...
4
votes
1answer
384 views
Functionally find the index of the minimum value in an array
I come from a C#/JavaScript/TypeScript background and am learning F# by implementing fundamental algorithms. This is finding the minimum value in an array:
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3
votes
1answer
942 views
Implement array element swap in a functional language
Sorting algorithms involve swapping element positions in an array. This is my implementation of swap:
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2
votes
2answers
71 views
Immutable recursive binary search of a generic array
I am new to F#. Is the following code, which represents about three hours of work, a canonical way to achieve binary search? If not, how can it be improved for readability and maintainability?
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5
votes
1answer
106 views
Learning F# with Prime Factorization
In my quest to learn F#, I implemented Prime Factorization.
First, the code:
...
5
votes
2answers
238 views
Immuitable recursive linear search of an array of string
I am new to F#. Is the following code, which represents about three hours of work, a canonical way to achieve its goals. If not, how can it be improved?
For instance, can we provide a default value ...
7
votes
2answers
584 views
Caesar cipher in F#
I'm trying to broaden my horizon by learning functional programming (coming from OO, specficially C#). For this, I'm implementing some small problems to get a feeling for the language. One of my first ...
4
votes
1answer
81 views
Calculator for magic item creation in RPG
I have created a simple calculator that will assist in creating magic items from the tabletop RPG Pathfinder. Here are the full requirements, and if you want a more concise version, here is a player ...
3
votes
1answer
163 views
4
votes
1answer
189 views
Searching files in directory with various filters
Requirements
Note: the requirements are invented by me for practicing functional programming.
Functional Requirements
Given a directory, all files below the directory (and its sub directories) ...
1
vote
1answer
668 views
F# binary reader
I've written a fairly simple script in F# which reads structured data from binary. I've avoided using the built-in .NET BinaryReader class because it's stateful in that it maintains its index in the ...
6
votes
1answer
128 views
Reading numbers from console until input isn't a number
I want to read N numbers (Nmax = 100) from console into a list. N is not known, but the first input that is not a number may break the reading process... However the solution should be as simple as ...
5
votes
2answers
810 views
Event sourcing using functional programming
Is this a satisfactory implementation of event sourcing using functional programming?
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4
votes
2answers
198 views
Compact game of life implementation
I am learning F# and implemented Conway's Game of Life as an exercise (There are also other implementations on CodeReview). I have tried to forget all my object-oriented background and practice "...
1
vote
0answers
146 views
Simple INI and command-line parsing, functional programming edition
I'm in the beginning stages of rewriting the model layer of my VBA Sync Tool in F#, to better learn functional programming. So far I've defined:
A public ...
7
votes
0answers
402 views
A* Algorithm in F#
Inspired by this post I looked up A* on wikipedia and went on with my own implementation as seen below where I try to mimic the pseudocode on Wikipedia but in a recursive manner.
I would like any ...
4
votes
1answer
120 views
Pool Checkers with AI
I recently added Pool Checkers to my Checkers game. My main concerns are about how I manage calling the correct variant in my PublicAPI functions. Because this is ...
3
votes
0answers
106 views
F# implementation of the A* algorithm round 2
This is my second attempt at implementing the A* algorithm using F#, the first one is here.
What I changed:
I removed the Node class and added two records named ...
3
votes
1answer
204 views
F# implementation of the A* algorithm
This is my first attempt at writing something useful in F# and in a functional way in general. I would appreciate if you could point out any issue, even details, as I'd like to put all the bad habits ...
0
votes
1answer
283 views
3
votes
3answers
192 views
F# program to generate a Map of substrings frequencies
I wrote the following F# program that takes an input txt file and create a Map that contains all possible substrings of size N and their frequency in the file.
In other words if I call the program ...
5
votes
1answer
122 views
Compute a value (and update a CSV record), based on prior value
The F# code below embodies the two specific questions I have. It is part of a working transformation utility, the entirety of which, including sample data, is in this gist:
http://bit.ly/2i3kUwF.
...
10
votes
2answers
639 views
American Checkers with AI
This is the third question in the series. Number 1 had most of the official two-player rules implemented, and Number 2 was the basic UI. This one has the complete two-player rules implemented, an AI ...
6
votes
2answers
235 views
Navigating a bounded 2D list (Advent of Code, Day 2: “Bathroom Security”)
I'm trying to solve the following Advent of Code problem in F# for practice.
Description of problem (can be found here):
Basically, there's a 'key pad' that I need to figure the combination to. To ...
11
votes
1answer
454 views
American Checkers
I am implementing the logic for a Checkers game in F#. I am writing my code in a library so it can be called from any UI provider, and am trying to do it in good FP style. I currently have the ...
2
votes
1answer
1k views
Wild and changing business rules implemented with functional programming
I attempted the Business Rules Kata. Here's a video overview.
However, I am not confident that going functional is a good strategy for the following objective:
How can you tame these wild business ...
6
votes
2answers
98 views
Probabilistic Matrix Inspection - Suggested by a paper, implemented by me
I have read this paper and I actually found it interesting.
This is an attempt to implement the proposed algorithm. I would like to know:
Is my algorithm correct by what is discribed in the paper?
...
1
vote
1answer
137 views
2
votes
2answers
365 views
F#unctional Immutable Trie (Prefix Tree)
I've created the following implementation of a trie in F# as an effort to learn the language. I would like to know what could be done to make it more idiomatic. Any other pointers are welcome as well.
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4
votes
1answer
179 views
Word splitting / text parsing with consideration for quotes
Is the MoveNext operation inefficient here? I really just want to increment an index. Originally, I had a mutable variable locally in ...
1
vote
0answers
117 views
MailboxProcessor and prioritized messages
I'm trying to create an agent that holds on to Data and does further work with it upon receiving the Work message. ...
4
votes
1answer
148 views
Print diamond of any size
I'm trying to print a diamond of asterisks of an arbitrary size. I'm new to F#, so I'm interested in virtually any feedback, but especially adherence to idioms, convention, and functional orientation.
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2
votes
1answer
465 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
274 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
2answers
128 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 ...
1
vote
2answers
630 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
160 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
41 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?
...
7
votes
1answer
100 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
443 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
2k 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
196 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:
...
10
votes
2answers
344 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 ...
3
votes
1answer
407 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 ...
11
votes
3answers
734 views
Return total balance from unsorted purchase items that may have specials
This is in reference to the following kata:
...
3
votes
1answer
201 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 ...
