Scala is a general purpose programming language principally targeting the Java Virtual Machine. Designed to express common programming patterns in a concise, elegant, and type-safe way, it fuses both imperative and functional programming styles.
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2answers
38 views
Refactor jaccard similarity the “Scala way”
I'm trying to pick Scala up. This is a simple heuristic that checks a similarity value between two sets. I've done this a million times in Java or Python. The function works, but I'm certain I am not ...
3
votes
1answer
50 views
A simple “Tamagotchi” like game that uses math questions as food
I wrote a Tamagotchi-like game where to feed the pet, you do math questions instead of just pressing a button. It's persistent, in that on loading, it figures out long it's been since the last save, ...
6
votes
3answers
137 views
Checking for balanced parentheses
I wrote a method to check if each parenthesis in a string is closed. It should take into account the order in which a parenthesis is presented, e.g. "hello)goodbye(" should return false even though ...
2
votes
0answers
37 views
Scala BitSet implemented with Java BitSet, for use in Scala Enumerations to replace ValueSet
Due to a performance profiling hot spot detailed in http://stackoverflow.com/questions/27632554/scala-enumeration-valueset-slow-replacement-based-on-java-bitset , I implemented my own BitSet using ...
13
votes
1answer
74 views
Oh ye beloved bejeweled
Before @bazola asked his recent question we chatted about it for a bit. I figured that I could try implementing something similar myself.
As I've heard that Scala has all the advantages of Java but ...
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vote
0answers
38 views
Scala Case Classes
Please take a look at the following Scala program and give me suggestions for improvement. I'm sure there would be plenty. This is my very first Scala code, so please don't be frustrated because of ...
2
votes
3answers
70 views
A Cipher with 2 methods for encryption/decryption
I'd like advice on how this could be written more efficiently, idiomatically, or just anything that could be improved upon.
I'd also like to know if there's an alternative to my ...
1
vote
0answers
50 views
Idiomatic Scala for nested map/flatmap
Does anybody have an idea on how to make this code more idiomatic? I tried to use scalaz Traverse, but it didn't really help.
Given the types and method signatures:
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11
votes
1answer
86 views
First four Project Euler in Scala
I was working on teaching myself some Scala and decided to tackle some Project Euler problems. The first four of these turned out to be one liners.
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5
votes
3answers
65 views
Generating a game board with squares in a rectangle
I am trying to generate a game board (similar to a Monopoly board). I am new to Scala and am thinking that there may be a better way to do this. But improvements to the code are also welcome.
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3
votes
2answers
66 views
zipWith function in Scala
My implementation works, but it looks very ugly. Curious to see how it's better implemented.
The zipWith function takes a list of lists (...
2
votes
3answers
67 views
Removing nested blocks from a string
I wrote this function in scala that uses tail recursion to remove nested blocks from a text.
Usage examples:
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2
votes
1answer
61 views
Dealing with state
I am working on something that involves the observer pattern. A simple version of that looks like this:
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10
votes
2answers
126 views
“Pure” functional simple Scala battle game simulation
I am a long time imperative programmer (mostly C++) taking my first forays into functional programming with Scala.
I am following some online tutorials about functional programming and Scala and I'm ...
2
votes
1answer
76 views
Ported C# scheduling to Scala - does not feel idiomatic
I'm taking a design workshop, we've received a short task which is:
To parse an input file of processor jobs.
To simulate scheduling of those jobs on a parallel computer (each job needs X ...
2
votes
1answer
32 views
Access case class parameter inside a map with default [closed]
I have a map whose values are case classes, and I want to access one parameter of that case class with a default value if they map doesn't contain the provided key.
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5
votes
2answers
104 views
Simple search engine using TF-IDF (200 LOC)
I wrote simple search engine based on TF-IDF statistic and cosine similarity. I am still learning Scala, so would be glad to hear comments (here or at GitHub) regarding my code from Scala ...
2
votes
2answers
218 views
Comparing equivalent Scala and C# string-manipulation code - with Scala running much slower
I am very early in my journey of learning Scala, and I was doing challenges on hackerrank.com to get used to the syntax. As I finished one (very trivial) challenge, I noticed that the run times seem ...
10
votes
2answers
106 views
Value Mapper service
I have some data I'm getting from an external source that I don't control and have been told that I have to map some of it to "user friendly" display values. So I wrote a little utility service to do ...
3
votes
2answers
163 views
Removing asInstance[T] from scala code
I've written this scala code and I cannot work out how/if it is possible to remove the asInstance in the definition of class ...
2
votes
1answer
198 views
Distributing workload using Akka Router with exception handling
I am fairly new to Akka and I am interested in any feedback about the following code. Is this the correct way to go about distributing workload across a number of threads? Do I use the Akka API ...
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vote
3answers
127 views
Realizing a SQL ResultSet into a Map in Scala
I am trying to realize a java.sql.ResultSet into a map, in Scala.
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2
votes
0answers
42 views
MySQL natural search and like search
I have written two queries for searching, but I want to simplify them as it seems needed.
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5
votes
2answers
120 views
Project Euler #17
Project Euler presents problem 17:
If the numbers 1 to 5 are written out in words: one, two, three,
four, five, then there are 3 + 3 + 5 + 4 + 4 = 19 letters used in
total. If all the ...
5
votes
1answer
67 views
Dictionary synonym lookup via networking
I have a small TCP service running on port 4444 which, given a word, will look up synonyms in a dictionary. Below is my Scala code for connecting to the socket, sending the lookup command and parsing ...
6
votes
1answer
111 views
BFS and DFS tree traversal
I posted some code as part of an answer to another question and I thought it would be a good idea to get that code reviewed also.
Any comments are welcomed, but I am mostly annoyed by ...
3
votes
2answers
116 views
BFS tree traversal Scala
I would love some feedback on the following code for BFS traversal in a binary tree. Is there a cleaner way to write this?
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3
votes
2answers
101 views
Cleaning up file resources in a DRY manner
I've written a function that generates a report, and then sends it as an attachment to an email. I don't want to clutter the function with a lot of calls to close up the filesystem, if there was an ...
3
votes
2answers
114 views
Hamiltonian Monte Carlo in Scala
I'm writing a program in Scala to perform Hamiltonian Monte Carlo (HMC), coupled with Gibbs sampling of some variables. The algorithm, with the modifications such as perturbing epsilon and l and ...
3
votes
2answers
212 views
7
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3answers
260 views
Reducing boilerplate when validating parameters and using a tuple for the parameter list of a case class
I had designed a simple case class that looks like this:
case class StreetSecondary(designator: String, value: Option[String])
I needed to add validation (to ...
3
votes
1answer
161 views
Writing a new Finagle protocol
The following is a fairly naive implementation of a Finagle protocol that uses the scodec library for binary encoding and decoding. I'll assume something like the following SBT setup:
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1
vote
1answer
62 views
Combinations with replacement
I am still new to Scala and wrote a small snippet to find all the combinations with replacement of a sequence (e.g. cwr(ab, 3) should give aaa, aab, abb, bbb).
The slow way would be to generate all ...
8
votes
1answer
112 views
Dungeon generation in Scala
I've recently begun learning Scala, and while I've run into its concepts before (immutability, tuples, first-class functions) I'm not sure whether I'm using the language how it's supposed to be used. ...
5
votes
1answer
77 views
4
votes
3answers
74 views
1
vote
2answers
135 views
Finding Duplicate (Key, Value) in Map
I wrote a function for checking if a Map[(String, String)] contains an element with a matching key and value:
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8
votes
0answers
114 views
Implementing a generic and covariant Set in Scala
I'm struggling with manually implementing a simple purely functional Set that's also generic and covariant on its type parameter:
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0answers
64 views
Functionally Typed I/O Streams
I thought up a function that provides types with InputStream and OutputStream:
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2
votes
1answer
65 views
Aggregating values of a path-dependent type
I have a type representing an immutable order which contains immutable order lines that belong to it. I want to use path-dependent types for this. Obviously you cannot instantiate a path-dependent ...
10
votes
2answers
209 views
Sending SMS through twilio from play framework
I am trying to send SMS using Twilio with Scala 2.10 in Playframework 2.2, but this code is looking odd to me, maybe due to lots of conditions. I'm sure it needs some important reviews.
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3
votes
2answers
103 views
Timing Project Euler Problem 1
Is there a better way to time the functions and print the result and function name dynamically?
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1
vote
4answers
107 views
Transforming a list of maps representing bands
I have the following code, it takes a list of maps representing bands and transforms the band properties via the pipeline_each method.
As you can see in the code, ...
2
votes
0answers
176 views
Netty-based safely network reconnection
I am writing a TCP client app using netty
NettyConnectionManager.scala:
...
1
vote
0answers
47 views
Elementary foldMap implementation
I think I got the implementation right, but I'm a bit unsure if this implementation will do fine in terms of space (stack) because I'm doing a foldRight. Would I ...
4
votes
1answer
322 views
Binary search in functional-style Scala
Curious to know how I can improve it, especially the pattern matching part seems a bit repetitive at the moment (lots of case x if ds(x))
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3
votes
1answer
153 views
Uploading a video in S3 Using Future
I've posted a similar program previously, but I have not made any major modifications in the code, so I am posting it again by deleting the previous question.
I am afraid of the thread keyword and I ...
2
votes
2answers
61 views
Branching with multiple Try
I have a series of four method calls that all return Try[Something], with the last returning Try[Unit]. Something like this:
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3
votes
2answers
189 views
5
votes
2answers
197 views
Connecting to RabbitMQ
I would like a review for this connection to RabbitMQ. I just developed it and seems to be working well, but I would like another set of eyes on it before putting this on the sever.
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