Tagged Questions

3
votes
1answer
54 views

is there a better and more functional way to write this

I'm learning Scala and functional programming. Can I make it more functional? Thanks class Student(val firstname: String, val lastname: String) { override def toString: String = firstname + " " + ...
3
votes
1answer
47 views

How to make this code more functional?

I have a simple task: Given a sequence of real numbers. Replace all of its members larger than Z by Z. And count the number of replacements. I solved this task using Scala. But my code looks ...
2
votes
2answers
132 views

Option type in C# and implicit conversions

Good morning everyone, I have decided to create a simple Option type for C#. I have essentially based it on the Scala's Option. It was mostly a fun exercise, but it might come in handy at work or ...
5
votes
2answers
215 views

Typesafe Tic-Tac-Toe API

So I've been working on Tony Morris' Tic-Tac-Toe challenge. The rules are as follows: Write an API for playing tic-tac-toe. There should be no side-effects (or variables), at all, for real. The ...
2
votes
1answer
160 views

Scala: tail-recursive factorial

Is there anything what could be improved on this code? def factorial(n: Int, offset: Int = 1): Int = { if(n == 0) offset else factorial(n - 1, (offset * n)) } The idea is to have tail-recursive ...
5
votes
3answers
257 views

Scala: a safer way to cut string

I want to get just the first line of a big string. Currently, here's how I do it: def getFirstParagraph(txt: String) = { val newLineIdx = txt.indexOf("\n") match { case i: Int if i > 0 ...
5
votes
2answers
178 views

Change code to use functional style

I tried to solve a programming contest problem in Scala, but I have a feeling, that it could be done in a more functional way. I compared it with the solution written in imperative style and it is not ...
1
vote
0answers
65 views

Defining transpose on a collection of irregular collections

I was asked to submit my request for code review on http://stackoverflow.com/questions/10672046/defining-transpose-on-a-collection-of-irregular-collections here. This is a follow-up to the post I ...
4
votes
2answers
115 views

Attempting to eliminate var (and imperative style) from my Piece class

I've been cooking with gas since I got Daniel C Sobral's help on my last question. I am now re-reading Odersky's "Programming in Scala, 2nd Edition" (finished my first reading about this time last ...
2
votes
1answer
83 views

Ideal FP/Scala way to vaildate rectangular list

I am learning Scala and FP (Functional Programming), coming from Java, OO and a strong imperative pardigm. I am now trying to implement a small puzzle solving project so I can get some deeper hands on ...
4
votes
4answers
239 views

Finding the first stream of non-repeating elements in Scala (without recursion or side-effects)

Here are some examples: [1, 2, 3, 4, 5] => [1, 2, 3, 4, 5] [10, 15, 10, 15, 30] => [10, 15] [1, 2, 3, 4, 1, 5, 6, 7] => [1, 2, 3, 4] Here's my best (and deeply ugly) non-recursive, ...
2
votes
1answer
152 views

Scala object-function balance

I am learning Scala, coming from Java background. Here I have written a small prototype proof of concept program that is a part of concept base for a simple upcoming tutorial game. There are two game ...
3
votes
1answer
255 views

Functionally retrieving rows from a database in Scala

Consider the following piece of code: var result = List[Measurement]() val dbResult = conn.createStatement.executeQuery(unsentMeasurements) while(dbResult.next) { result ::= ...
2
votes
2answers
248 views

Multiple if conditons in scala using funcional programming

The following code has a lot of conditionals. I am trying to write it in a functional programming way. val basePrice = { var b = 0.0 if (runtime > 120) b += 1.5 if ((day == Sat) || (day ...
1
vote
2answers
321 views

Scala mastermind solver, which is the most scala-ish

I am trying to express the classical TDD kata of mastermind in the most idiomatic scala I can. Here is a scalatest, test suite : package eu.byjean.mastermind import org.junit.runner.RunWith import ...