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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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 ...
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3answers
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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. ...
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45 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hal in one of my personal Clojure projects, but unfortunately the only library I could find (halresource) was somewhat out of date when compared to the current specification.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 ...
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93 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 ...
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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 ...
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“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. ...
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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 ...
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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 + ...
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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 ...
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Translating CFRM algorithm from Java to Clojure, + 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: ...
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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 ...
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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 ...
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Second to last word

Grab the input file, and output the second to last word on every line. Can I make it shorter and/or more efficient? I'm surprised by the performance. While the runtime, +2s, is likely dominated by ...
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Is this the Clojure way to web-scrape a book cover image?

Is there a way to write this better or more Clojure way? Especially the last part with with-open and the let. Should I put the ...
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1answer
44 views

Scamble a vector, preserving the sum

My first crack at clojure... if you have time to provide input, I'd appreciate it. I'm as much interested in style as proper usage. I'm just getting started. The task to start with an vector of N ...
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56 views

Exercism assignment for word-count in Clojure

I would appreciate some insights / comments from Clojure regulars out there about my submission here. ...
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79 views

Database Migrations

I'm starting to learn Clojure, and would like feedback on some code I wrote to manage database migrations. Any recommendations to make it more robust, efficient, idiomatic, elegant, etc... are ...
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64 views

Generating two .csv files from named parameters

I wrote Clojure code which takes named params and has to generate 2 .csv files as output. Please review it. ...
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84 views

Filtering a dictionary by subject of definitions

I am writing a function to filter a "dictionary" by the "subject" of its definitions. The dictionary data structure is a hash-map of this kind: ...
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96 views

Centroid of a polygon in Clojure

I am studying Clojure and functional programming. I wrote this function to compute the centroid of a polygon specified as a vector of points, e.g. ...
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773 views

Clojure Neural Network

After reading this article about Neural Networks I was inspired to write my own implementation that allows for more than one hidden layer. I am interested in how to make this code more idiomatic - ...
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103 views

A text-templating system similar to PHP…but with Clojure

I wrote a simple text-templating/processing system which resembles PHP, except that it works with Clojure. The main goal was to provide an easy way to use Clojure PHP-style for small files. This is a ...
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322 views

Idiomatic clojure code in a markdown parser

Some time ago I created a markdown parser in clojure and I would like to get some feedback, since I'm a clojure noob in the first place (is the code understandable?/is it idiomatic?/can some things be ...
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1answer
274 views

Idiomatic input parsing in clojure

I've been playing around with Clojure for a while now, and one of the tasks I occasionally find awkward is parsing input. For example, I took part in the facebook hacker cup recently, where part of ...
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Clojure - substring? function

Trying to write a substring function in Clojure. I am sure there is a more idiomatic way. Can anyone enlighten me? Otherwise, here is my version. Thoughts? ...
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Hangman - my first Clojure code

This is my first attempt at Clojure! Apart from all game related issues, how is my code? Is there anything I can do to make it more idiomatic? ...
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Clojure tokenizer

Please review the following Clojure tokenizer. The goal is to study Clojure, so sometimes I re-implement functions (it will be nice to see standard functions for this). Beyond of this, code seems ...
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Clojure function greater than 10 SLOC

It has been mentioned in the Clojure Style guide to avoid functions longer than 10 SLOC but mine has more than 10 (47 to be exact). The code is an web api implementation and follows like this: ...
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Clojure code for finding prime numbers

This is my Clojure code for finding prime numbers. Note: this is an advanced version which starts eliminating from i*i with step ...
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Being Lispy with Hy, a Python Lisp dialect

I think I'd like to learn Clojure eventually, but at the moment am having fun with Hy, a "dialect of lisp that's embedded in Python." ...
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API wrapper for Clojure, idiomatic style for libraries?

I wanted to wrap the jkeymaster library in a Clojure wrapper (for my own use, but perhaps also to save others some time). I'm just learning Clojure so I'm still not quite sure what "idiomatic ...
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374 views

Connect Four AI (Minimax) in Clojure

I wrote a Connect Four game including a AI in Clojure and since I'm rather new to Clojure, some review would be highly appreciated. It can include everything, coding style, simplifications, etc. But ...
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257 views

Clojure: Idiomatic use of atom and ref?

I am working out a bit of Clojure code that will take a ref to a map and increment a key value pair in the map. I think I am using ref correctly, but Im not sure about atom. Do I need to use swap! ...
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136 views

Finding first match in recursive search

I am searching a recursive solution space and would like to return the first match I find. (I am using this to solve sudoku, but I guess this would apply to any recursively defined problem or ...
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143 views

single-threaded socket server

I wrote a basic Clojure single-threaded socket server, mostly following Java examples; in particular I'd appreciate feedback on three things, how I handle mutable state (I/O, managing connections). ...
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Is there a better way to extract a single value instead of a sequence?

The following code works, but I'd like to re-write, so that a single index is returned, rather than a sequence of indexes visited. Here are the defs and function. ...
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292 views

Excessive use of let a problem in Clojure?

I have this set of functions - it works, but I'm concerned about the use of lets. ...
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Making my back-propagation clojure code more idiomatic

I've written an implementation of the back-propagation algorithm in clojure (here). This is my first attempt at clojure where the code totals more than ten lines and so it is not very idiomatic; ...
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1answer
203 views

Discovering words from letters in Clojure (Letterpress Solver)

I created a Letterpress solver that will take a string of letters and return a list of valid words that can be constructer with the provided letters. Not all letters need to be used in each word. ...
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Idiomatic Clojure? Performant & functional enough?

Problem Disclaimer: This is my first clojure function & I'm still busy finishing the last chapters of "Programming Clojure". Thanks! :) I am writing a function to randomly flood-fill parts of a ...
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1answer
71 views

How can I simplify the following to avoid sequence of maps?

Given the following code, I have written a for loop that returns a key and value (0 or 1) of file names passed. 1 means present, and 0 means not present. Is there a way to construct a flat map ...
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239 views

Inverted index in Clojure - performance vs. idiomatic code

I have this code to create an inverted index from a directory of text files: ...
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Shepard Tone stream generation in Clojure

This is my work to generate an infinite Shepard Tone. It is written in Clojure and works by generating repeating streams of incrementing frequencies, converting those to values on a sine wave and then ...
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1answer
111 views

Calculating Pi in Clojure

Obviously there are better ways of obtaining Pi, but for educational purposes, how is the code below? ...
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139 views

First Go at Clojure and Functional Programming in General

Here's the code... My goal is to simulate a Pile shuffle of a vector. Here's the function.. ...
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1answer
118 views

Clojure: Find specific element in HTML tree

I am trying to find all "link" elements that link to RSS feeds in a data structure created by clj-tagsoup. I wrote the following code, which seems to work fine. But: I come from a Java background and ...
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Idiomatic letterpress cheater

Hello dear Code Reviewers, I'm playing around with Clojure and am having a lot of fun. It's quite hard to go from imperative languages to Clojure, and I need some guidance on how to make the ...