Unanswered Questions

11
votes
1answer
154 views

Do classes in a JRE library support observable and/or asynchronous reads from external/non-JRE assemblies?

How can I implement my cross-platform library (e.g. on JRE) to operate in a thread-safe manner on object references, so that native front-ends on other platforms can observe the object and take ...
10
votes
0answers
247 views

Why do Haskell functors only have derived types in their target category?

In Haskell, the Functor typeclass functor is defined as follows (see e.g. Haskell wiki): class Functor (f :: * -> *) where fmap :: (a -> b) -> f a -> f b As far as I understand ...
9
votes
0answers
137 views

Unit testing for data munging pipelines made up of one-line functions

Reading Mary Rose Cook's Practical Introduction to Functional Programming, she give as an example of an anti-pattern def format_bands(bands): for band in bands: band['country'] = 'Canada' ...
8
votes
1answer
189 views

Code Design: Delegation of arbitrary functions

On PPCG, we frequently have King of the Hill challenges, which pit different code bots against each other. We don't like limiting these challenges to a single language, so we do cross-platform ...
8
votes
0answers
135 views

Algorithm to generate Edges and Vertexes outwards from origin with max multiplicity of 3

I am creating a 2d game for a website where the universe can grow extremely large (basically infinitely large). Initially, the universe is composed of 6 stars that are an equal distance from the ...
7
votes
0answers
97 views

After breaking our code into reusable bits, how do we test and deploy?

We started out with one developer, and one svn repo containing all our code: ^/foo/trunk/module-a ^/foo/trunk/module-b ^/foo/trunk/module-b/submodule-b1 ^/foo/trunk/website1 (at the time this was a ...
7
votes
3answers
221 views

Best solution to authorize that a user is only allowed to modify/act with their own resources in a REST API

Background: Currently in the process of building out a REST API, using node w/express and it is consumed by a mobile app and eventually a (modern browser based) website. I'm trying to identify the ...
7
votes
0answers
239 views

How do I associate command objects with the right receiver?

I tried to use Command Pattern for implementing Undo and Redo in my project public abstract class Command { protected Form Receiver { set; get; } protected HtmlElement Element { set; get; } ...
7
votes
1answer
226 views

Heuristic Approach for Flexible DIFF Implementation

I have created a DIFF implementation to compare document revisions at work. It is based on An O(ND) Difference Algorithm and Its Variations. One thing that has become important is to take the list ...
6
votes
1answer
80 views

Data structure for determining intersection between line and polygon in 3D

I have a collection of non-self-overlapping simple polygons P. In actuality, they are 2D triangles in 3D-space. I'm looking for a data structure which, given a line L, has a relatively fast lookup ...
6
votes
0answers
116 views

Explicit DAG instead of Vector Clocks for synchronisation

I've started looking at approaches to data synchronisation among a set of peers. The peers must be able to work in a disconnected way and then synchronise together to merge their local changes. Peers ...
6
votes
0answers
375 views

Object Constraint Language (OCL) for Stack in java.util package

I have an exam coming up and I'm looking at past papers to get some ideas of what to expect. I'm a bit stuck on the following one and would really appreciate if someone could give some example ...
5
votes
0answers
41 views

Choosing a sequence of animations for an NPC - use a behaviour tree?

I am implementing an NPC to walk around a virtual space, specifically a cat. I have a series of short animation clips (3-5 seconds). My first instinct was just to choose a random animation when the ...
5
votes
1answer
40 views

How do I scale up a bot/service?

I have this bot that I've created for Twitter. It's written in Python. It lives on my Raspberry Pi and I've set up a cronjob to run it every 60 seconds. Part 2 of the project is to build a web app ...
5
votes
0answers
98 views

Algorithm to generate all sets of m points in n x n x n cubic lattice which are unique under symmetry

I am implementing an algorithm which is going to be quite computationally complex, and want to try to make sure I'm not doing unnecessary work. There is an n x n x n cubic lattice, e.g. if n=2 this ...

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