Kotlin is a statically typed programming language that compiles to JVM byte codes and JavaScript.
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Redis protocol implementation by Kotlin
I have created my first project on the github. It is Redis client protocol implementation (request-responce part only). I would like to make my sources more Kotlin style. Please, check my sources and ...
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1answer
34 views
Kotlin Data Class Wildcard
I'm writing a small custom DSL and interpreter as an exercise in understanding how the language stack (lexer/parser/(interpreter/compiler)) works. Because I want to be able to report the location of ...
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1answer
57 views
LeetCode: Add Two Numbers (in Kotlin)
(...as I still learning Kotlin) I found this "problem":
You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain ...
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2answers
39 views
Return the indices of the two numbers such that they add up to a specific target
(...as I learn Kotlin) I want to get the indices of the two numbers such that they add up to a specific target from a given array of integers.
Solution:
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1answer
53 views
Christmas Tree in Kotlin
Please review my code for printing a Christmas Tree.
The idea was to merge some functional programming ideas (immutability, streams) and OOP (every thing is a small object).
I'm looking for a review ...
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votes
1answer
72 views
Reduce amount of calls to database for authentication
I'm currently having a bit of code, which I just know can be improved a lot. I am just blind to it. All of my code looks quite neat to me, except these parts... The login + authentication process is ...
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votes
1answer
161 views
Event-driven finite state machine DSL in Kotlin
I wrote a DSL for defining a finite state machine. My robotics team wants to use a state machine to manage the state of the subsystems on our robot, like the arms, drive train, lifter, etc. Each ...
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votes
2answers
45 views
Maximise adjacent numbers in a functional style (PE#11)
What is the greatest product of four adjacent numbers in the same direction (up, down, left, right, or diagonally) in the [provided] 20×20 grid? [source]
This solution works, and works effectively ...
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208 views
Console command parser for my custom Libgdx console (gamedev)
For a game I'm writing using LibGDX framework and Kotlin language, I've decided to make a dev console. This is a WIP line parser. Since there's already a decent amount of code written I've decided to ...
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1answer
68 views
Credit card / IMEI check digit in Kotlin
I recently had the need to implement Luhn's Algorithm in a Java/Kotlin application. I needed a function that would add the check digit to the string of a number like a credit card or IMEI. It could be ...
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1answer
58 views
Postponed Prime Sequence in Kotlin
Following my previous unbounded prime generator and a followup by Martin R, I've tested the waters in Kotlin by making an unbounded sieve.
To quote Martin R's wonderful explanation of the base ...
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votes
0answers
49 views
Roman number converter in Kotlin
I'm learning kotlin and java. As a code-kata I wrote the roman to decimal converter. I'd be very grateful for code review.
I was trying to keep things simple and funcional. I'd especially appreciate ...
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31 views
Check the battery's charge level and emit an alert on low/high value
The following script check constantly the battery's charge level of the user's laptop via the acpi command. When such level reach a low/high value, the script will ...
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1answer
206 views
Counter with increment and decrement buttons
For my first Kotlin project, I'm implementing the Redux pattern with simple Increment and Decrement buttons and a text view to display the current value.
My main questions have to do with Kotlin and ...
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vote
1answer
144 views
Iterate through a 2D array. Kotlin extension method
Simple extension method for Kotlin. Should perform an action on every element in a 2d array. i.e. An array of arrays.
I have made the assumption that because the receiver type is defined as an array ...
2
votes
1answer
52 views
Interface to the Force.com REST API
I'm implementing an interface to the Force.com REST API, with very specific ideas about which parts of the API I need. My problem is with testability of consumers of this API abstraction.
The first ...
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votes
1answer
78 views
Number guessing game in Kotlin
Is this code missing any "Kotlinisms"?
I've just started learning Kotlin so I'm not yet familiar with the Kotlin way of doing things.
The program will guess a number you are thinking of.
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votes
2answers
196 views
Cache of shared observables (Rx)
So the idea is to maintain a cache of shared Observables - accessible by a key - which if not present will produce one using the given factory.
The underlying shared Observable is accessed via an ...
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3answers
97 views
Max heap implementation in Kotlin
I wrote this class a while ago to learn Kotlin and heaps, so any tips (on either my code style or my heap algorithm) would be appreciated!
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1answer
150 views
Stateless 2048 Game
I created a little Kotlin clone of the 2048 game that is playable in the console. My goals were readability and statelessness for no other reason than practice. Consider it a code kata wherein I didn'...
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votes
1answer
693 views
Simple thread-safe loading cache based on RxJava
I'm sketching a simple thread-safe cache which can load missing values. It is based on RxJava's Observable which also means that it should be possible for a client to join a request for value which is ...
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votes
0answers
186 views
Converting SpriteSheet Metadata .txt to .yaml
For practice I decided that I wanted to write an animation class for SpriteSheets. The problem is that a single Sprite can have different widths depending on the action they are drawn to act. A tool ...
