All Questions
Tagged with functional-programming object-oriented
95 questions
0
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API design for precomputation cache [closed]
In my numeric code library I have a function totient_sum that depends on an expensive one-time precomputation totsum_range = [...], then different calls to totient_sum(n) are quick. There are several ...
- 342
4
votes
5
answers
368
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Anemic Models vs. Rich Models: When to Use?
I'm working on an application and have encountered two different approaches for organizing business logic. There's a general consensus that application rules should be handled in higher layers, so I ...
- 49
2
votes
1
answer
288
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Did the term "decorator" originate with OOP design patterns?
The Decorator pattern allows behaviour to be dynamically added to an existing object, effectively "decorating" it with new behaviour. While the pattern as formalised and named seems to have ...
- 207
2
votes
1
answer
130
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OO vs FP: What is a good approach to understanding if heavy wrapper classes should be used?
Consider a processing system which ingests objects from an external source and performs extensive processing. One example could be objects detected by a computer vision system which are then fed into ...
- 265
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3
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Are "Distributed Enums" an Anti-pattern in non-OOP like they seem to be considered in OOP?
I have recently read about the so-called "distributed enum anti-pattern." In particular, as it relates to using enums in conditional statements. (The idea is apparently that if you were to ...
- 119
-2
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1
answer
170
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Which paradigm(between OOP and Functional) should be chosen for a given task?
Which paradigm(between OOP and Functional) should be chosen for a given task ? What are the tradeoffs between these two styles ? In which case using Functional makes sense and vice versa,in which case ...
- 25
1
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2
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196
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Should I add functionality by adding a new method to a class - or should I "register" the new functionality into a data structure?
I have one large class that computes ~50 different metrics (each metric has no side effects).
My code is similar to this:
class ReportingMetrics:
def __init__(self, data:pd.DataFrame, config:dict)...
- 343
4
votes
2
answers
308
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Should I use classes instead of functions with a state needed for computation?
I have implemented the cows and bulls game in C++.
The code:
#include <cstdio>
#include <cstdlib>
#include <ctime>
struct DigitMatches {
int matches_in_right_positions;
int ...
- 51
79
votes
10
answers
17k
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How functional programming achieves "No runtime exceptions"
How does a functional programming language, such as Elm, achieve "No runtime exceptions"?
Coming from an OOP background, runtime exceptions have been part of whatever framework that is based ...
- 889
5
votes
3
answers
707
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How could a computer program do anything if everything is immutable?
I feel this is a bad question because I probably do not understand what I am talking about. In my effort to learn about functional programming, I became stumped on understanding the idea of immutable ...
- 77
-1
votes
1
answer
210
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Refactoring: Pythonic way of reducing the subclasses?
background: so, I am working on an NLP problem. where I need to extract different types of features based on different types of context from text documents. and I currently have a setup where there is ...
- 109
1
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3
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253
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Is it a good practice for functors to store outputs as instance attributes?
The question pretty much says all, but let's look into a simple example (I'm using C++, but the question is not strictly related to any particular language):
So, let's say that we have a functor that ...
- 137
1
vote
4
answers
693
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Can writing Object-Orientated Code in a Functional style improve performance?
Given a scenario where you have consecutive setters or a series of events where an object is modified, can it be more performant to instead write code in a way where a new state is returned rather ...
- 129
1
vote
4
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883
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Design pattern for a function class
I have been experimenting with the idea of function classes as explained in this article and Composition applied to function dependencies as described in the following questions:
https://stackoverflow....
- 267
38
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7
answers
9k
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Do you need to think about encapsulation if you can ensure immutability?
Encapsulation
In object-oriented programming (OOP), encapsulation refers to the
bundling of data with the methods that operate on that data, or the
restricting of direct access to some of an ...
