Clojure is a Lisp dialect for the Java Virtual Machine. Its main features include a software transactional memory system for coherent updates to data structures, transparent access to Java libraries, a dynamic REPL development environment, runtime polymorphism, and built-in concurrent programming ...
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37 views
A* search algorithm in Clojure
Cost of nodes are represented by a matrix (called world), heuristic cost estimate/g score/f score are all represented in matrices.
The world and its size are ...
3
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1answer
60 views
Remove “lines” from a 2D vec
I have some code here that I am very unhappy with. The task I am trying to accomplish is this.
Given a 2d vec like this:
[[0 2 0] [1 3 5] [3 3 0]]
which can ...
5
votes
1answer
58 views
Designing a circuit of gates in Clojure and doing forward and backpropagation
I am reading Hacker's guide to Neural Networks. Since I am also learning Clojure, I tried to implement them in Clojure.
I would like the feedback about what could be more idiomatic and better in the ...
1
vote
1answer
53 views
Managing state in Clojure
Where should you store state and how should it be managed in a ClojureScript application? Take the following code for example - it's a "game" where you travel either down or left.
...
5
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1answer
83 views
Starting a Clojure Chess Engine
In my journey to learn Clojure I recently decided that I would like to write a chess engine, which is kind of funny because I don't really know chess either. ;-) My goals are to learn Clojure and ...
1
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0answers
68 views
Simple, functional URL parsing library in Clojure
I recently wrote some code to handle parsing of URLs, even if those URLs might not be one hundred percent perfectly well-formed. (This constraint made using Java's ...
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0answers
23 views
Sieve of Eratosthenes in Clojure
I am mainly interested in how to make the sieve lazy so that it will receive something like (iterate inc 2) and generate an infinite sequence of primes, but any ...
2
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0answers
42 views
0
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0answers
21 views
Multitenant Cassandra Query in Clojure
The following code handles querying for user data in a multitenant Cassandra database. Each tenant has their own keyspace and within that keyspace data about each tenants users is stored.
This code ...
4
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0answers
28 views
Perform a contains-ignore-case with multiple search-tokens
I had a look on Stack Overflow etc. on how to perform a contains ignore case with n given strings. Most answers suggested using regex for this task. Although it's a valid option, I prefer doing ...
1
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1answer
36 views
Read Space Delimited Text File to Standardized Data Type
From the README.md
Introduction:
The purpose of data-in is to read all the lines from a text file and return the file's contents as a Clojure value in a ...
10
votes
1answer
76 views
A port of the 1971 StarTrek game to Clojure
I ported the Star Trek 1971 game to Clojure to help me learn more about the language and functional programming in general. You can see the entire game on Github. The game plays (you can start it with ...
1
vote
1answer
33 views
Getting data from different services
I have a piece of code that tries to get some data from a different services, falling back to the next one if previous fails.
The code look a little bit ugly, though. Any suggestions on how to ...
6
votes
2answers
129 views
Water pouring challenge
I'm trying to write code to solve water pouring problem in Clojure. The following code is strongly influenced by Martin Odersky's solution lectured in his coursera course, Functional Programming ...
1
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0answers
24 views
Using atom to reference state in clojure
I am a newbie in clojure, and I am trying to implement a 2d fighting game in clojure both for fun and learning.
Since the characters in a fighter game are essentially state machines, I constructed ...
2
votes
1answer
50 views
Encrypting messages using the XOR operation
recently I've started to learn Clojure. I came up with an easy programming problem, described by this C code:
...
-2
votes
1answer
68 views
Clojure koans 14 - converting a map to a string
The koan is at the end of this snippet. It requires you to write a function to convert a map to a string, and then prepend a full name to it.
The following solution works fine. I am just wondering if ...
1
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0answers
66 views
Re-implementation of Caolan McMahon's parallel and map functions
I have wrote my first reasonably complete piece of ClojureScript code and would like feedback. It is basically a re-implementation of Caolan McMahon's parallel and
map functions from async in ...
3
votes
1answer
54 views
Getting rid of extra test during initialization of loop/recursion
I'm reluctant to ask this question. My code below works, it's intelligible, and it seems reasonably efficient. It's just that there's a trivial, nitpicky issue that's driving me crazy. The function ...
4
votes
1answer
214 views
Clojure Fibonacci
I'm a Clojure novice working through 4Clojure problems. In one problem I am supposed to create a function that takes a number and returns that number of Fibonaccis. My first thought was to create a ...
4
votes
1answer
64 views
Encapsulated state in clojure
While going through SICP and trying to implement the code in clojure, I've found that while I can get the code in chapter 3 to work, it seems to go against Clojure idioms, but I can't quite imagine ...
1
vote
1answer
43 views
Parsing HTML, XML into a hash map of products
I'm working on a simple parser that is supposed to extract hash maps representing vinyl records from web pages (online stores) and XML files. The goal is to have a parser that I can easily run with ...
3
votes
2answers
156 views
Clojure solution to HackerRank Challenge 'Restaurant' under Number Theory
My main concern is how messy the min-number-of-slices function is. I would appreciate help finding good ways to clean that up since it has a lot of nesting/scope.
...
1
vote
1answer
61 views
Determine if braces in a string are balanced in Clojure
I'm currently learning Clojure, and am working through a few exercises. The exercise that I'm working on right now is accept an arbitrary string and determine if the opening and closing parenthesis, ...
3
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0answers
40 views
4
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3answers
109 views
Clojure programming exercise for calculating change
I'm learning Clojure and have written a small function to calculate change. I don't like few things about the code and would primarily like to replace recursive call with something more idiomatic. ...
2
votes
3answers
86 views
Memorable combinations for Sargent mechanical combination locks
I have a safe with a manual combination lock that I periodically change the combination to. I like to use a combination that's easy for me to remember, so I thought I'd write a quick Clojure program ...
3
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0answers
149 views
Idiomatic way to implement `tail -f` in clojure
Disclaimer: This is just an educational task to learn how to program in clojure and switch brain to immutable state-way of developing (the provided snipped has some unused variables which I didn't ...
2
votes
2answers
200 views
Computing pairwise bitwise OR in a list of bit-strings
I am trying to solve this problem using Clojure:
You are given a list of \$N\$ people who are attending ACM-ICPC World
Finals. Each of them are either well versed in a topic or they are
not. ...
2
votes
2answers
37 views
Split every vector in a sequence into two parts: old elements that were contained in previous vectors and new elements never before seen
Am I doing it right? Is there some function in the standard library I should be using? This is my first real(ish) world Clojure program…
Input
...
5
votes
2answers
125 views
Performing an algebraic regression on syntax trees
I am quite new to Clojure and would need some advice on the following genetic programming gist I wrote as my first working clj program. The aim of it is to perform an algebraic regression using ...
1
vote
1answer
76 views
How do I bind a symbol in a conditional in Clojure? [closed]
In Ruby (on Rails) I would do this in a controller action to provide authentication:
...
3
votes
2answers
101 views
Clojure Tic Tac Toe solver
I am going through the 4clojure problems and I currently just solved the Tic Tac Toe analyzer:
...
6
votes
1answer
446 views
Clojure core.async web crawler
I'm currently a beginner with clojure and I thought I'd try building a web crawler with core.async.
What I have works, but I am looking for feedback on the following points:
How can I avoid using ...
8
votes
1answer
156 views
Project Euler #2 - Sum of even Fibonacci numbers to 4,000,000
This particular problem has already been posted here before, but the community is ok with me to post it again, so I can have feedback on my own implementation.
I tried to keep things simple, with ...
2
votes
1answer
48 views
Recreating merge-with
Just working through the questions on 4Clojure as I learn the language. This is my solution for #69. Would appreciate feedback as this one gave me a little trouble.
...
4
votes
1answer
64 views
Zeckendorf numbers the Clojure way
I'm just getting into Clojure, and I wanted to make sure I am writing code the "Clojure way". The challenge I took on is Zeckendorf numbers (fairly trivial).
...
1
vote
1answer
52 views
5
votes
1answer
129 views
Algorithm to Iterate All Possible Strings in Clojure
I'm fairly new to Clojure and I struggled a bit coming up with a nice Clojure-y solution for implementing an algorithm for one of my applications. The real issue I'm trying to solve would require a ...
4
votes
3answers
94 views
Parsing US address with Clojure
The parser below is not designed for every single US address. I am parsing through a file where each line may or may not be an address. I am more focused on speed rather than robustness.
...
2
votes
1answer
123 views
Clojure code for generating HAL JSON responses
I wanted to use hal in one of my personal Clojure projects, but unfortunately the only library I could find (halresource) was somewhat out of date when compared to the current specification. So, I ...
1
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1answer
128 views
Finding an entry in a Hashmap
I've been playing around with functional programming for a while now and just started learning Clojure. So the problem I'm trying to solve is the following:
I have a tree-like hashmap of tasks where ...
3
votes
2answers
100 views
Clojure function composition: logging results of an action performed by a “pure” function
I'm wondering how I could compose this program better allow it to grow more functionality without constant refactoring.
This is my code sample for Hacker School, so I'm less married to the results ...
3
votes
1answer
112 views
“Cookie Clicker Alpha” solution
I am trying to learn Clojure for some time. In my experience, it has been rather too easy to produce write-only code.
Here is a solution to a simple problem with very little essential complexity. ...
4
votes
1answer
182 views
Project Euler Problem 14 in Clojure
I recently began learning Clojure. In order to get better acquainted with it, I've been tackling Project Euler challenges.
Problem 14 is not really a difficult one. It asks for the number that ...
1
vote
1answer
60 views
Project Euler #20 solution in Clojure
Problem:
\$n!\$ means \$n × (n − 1) × ... × 3 × 2 × 1\$
For example, \$10! = 10 × 9 × ... × 3 × 2 × 1 = 3628800\$, and the sum of the digits in the number \$10!\$ is \$3 + 6 + 2 + 8 + 8 + 0 + ...
3
votes
3answers
119 views
More succinct / ideal solution to Project Euler #22
"Using names.txt (right click and 'Save Link/Target As...'), a 46K text file containing over five-thousand first names, begin by sorting it into alphabetical order. Then working out the alphabetical ...
5
votes
0answers
245 views
Translating CFRM algorithm from Java to Clojure and improving performance
Counterfactual Regret Minimization is an algorithm that can be used to find the Nash Equilibrium for games of incomplete information. I have tried to adapt the exercise from here to Clojure. You can ...
6
votes
2answers
141 views
Package manager in Clojure
I wrote a package manager in clojure that does 5 things:
depend a b //creates a and b (if they don't exist) and adds dependency on a
install a //installs a and its dependencies
list //prints out ...
3
votes
2answers
52 views
Basic reverse function
I am just starting out in my Clojure journey and I wonder if anybody can point out my beginners mistakes in my function below that simply reverses a list. I know that there is already a reverse ...
