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Functional programming is a paradigm which attempts to solve computational problems by the chained evaluation of functions whose output is determined by their inputs rather than the programme state. In this style of programming, side effects and mutable data are deprecated and usually strictly isolated.

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I'm learning Domain-Driven Design (DDD) and studying different architecture patterns, and I’ve come across two seemingly conflicting design philosophies around domain modeling. 1. Rich Domain Model ...
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I’m designing a backend in TypeScript (could also apply to JavaScript), and I’m wondering about the architectural approach. Is it better to stick to a single paradigm (e.g., fully object-oriented or ...
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Not long ago while I was exploring for solutions to test without mocks I've found out about the functional core, imperative shell architecture. It sounds great, I also think that it would play nicely ...
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I'm currently drafting a Python coding standard for internal enterprise use, primarily targeting business applications that involve heavy data access, reporting, and transactional logic. In this ...
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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 ...
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My example applies to reading and deleting files (I/O), but this is probably a common scenario (eg, keeping local and global state in sync in functional programming). I am reading in files from a ...
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I am trying to refactor some JavaScript code to use functional programming principles. I have some functions that I want to use in a series of maps. const transformedData = rawData .map(...
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This question is not meant to be a critique of functional programming, but more hoping for resources and opinions. I am refactoring some historically messy code so that it follows functional ...
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(this question is written using javascript for examples) Say I have a bunch of files that I need to access sequentially: 1.json 2.json 3.json 4.json ... Say I want to transform the data in all of ...
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(this question is written from a functional javascript point of view) say you have some pure functions: function a (arg) { ... return result } function b (arg) { ... return result } function ...
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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 ...
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For the following component, how would I extract the unit logic to allow for composition? In my actual app I am trying to reduce the amount of logic encoded in the component and I have decided that ...
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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 ...
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Python, Ruby, Rust, Haskell, Kotlin, C#, C++, Perl, MATLAB, SQL, and R all call their respective array predicate checking functions any and all. Is there any record of why JavaScript's designers ...
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While I was learning functional programming I have encounterd two for me very similar terms: immutability and persistence. Also I have read simular questions from stackoverflow, but I am still ...
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If I'm writing Scala functions and have to check for nulls in situations where I can't avoid it (say, working with Spark UDFs and some legacy Java types), is it better to turn things into Option or to ...
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The Kotlin language brings the simplification of function calls to the natural language. This article shows a nice example: Function: fun of(suit: Suit) = Card(this, suit) val card = Rank.QUEEN.of(...
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What would make more sense, to use functions for exports/imports: // globals/helpers.js exports.fnOne = () => {} // features/user.js const {fnOne} = require() Or class-based approach with static ...
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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 ...
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Consider the following Typescript code: function exampleAction(target: Target, options: ExampleActionOptions) { // ... } export function getExampleAction(options: ExampleActionOptions) { return (...
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.NET Boolean type usually makes if else pair all over the code. Functional Boolean should be more like Either type. Ideally represented as Either<Unit, Unit>. However, my issues with Either type ...
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I am interested in robotics programming. HW control often involves calculating the derivative or integration of the signal. It seems quite inevitable to avoid local states for such calculation. (Since ...
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I am reading through "Clean Architecture: A Craftsman's Guide to Software Structure and Design" and it says that: All race conditions, deadlock conditions, and concurrent update problems are ...
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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 ...
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By definition, a pure function is deterministic + no side effect. Is there any example for a function which has no side effects, but is non-deterministic? I.e., a function without side effects, but ...
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I have thought of this for a while and I want to know what you think about this. This is more of a way to structure the code that might not be 100% object oriented and that is not the purpose. I would ...
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I am working on a compilers assignment in OCaml, and the following is an example of the pre-written code in said assignment: (* Build a CFG and collection of global variable definitions from a stream *...
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I'm recently learning the programming language, and I wonder how compilers work when the language itself does not allow recursion, like how the compiler or the runtime checkers makes sure that there ...
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I often come across this dilemma in my own code and wondered if there is a term for this and if there is a single solution to it. Let me illustrate it with a pseudocode example of making a table from ...
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Programming languages traditionally have blocks that specifically cater to controlling iteration. There is the simple while-loop: while (i < 3) {...}; Then there is the more complicated for-loop: ...
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I don't know from where I got this but in my head a function returns a value and a method does not. I know that with OOP a method is a function related to a class. But I am trying to remember where I ...
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I am working on a project that is structured in hexagonal architecture. It is a multi module gradle project where web layer is a separate module that depends on the domain module. Sample code related ...
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When trying to follow a functional programming paradigm, I often find myself in a situation where I have a chain of functions that I would want to combine/compose somehow, but they all also take in a ...
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I am implementing if/else statement, by using function "inCase" to make it more readable: const size = 'small' const equals = str1 => str2 => str2 === str1 const inCase = (obj) => ...
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I'm new to DDD and I would like to clarify some concepts. I'm thinking about DDD in the client-side. The first one is regarding transactions: My understanding is that transactions are a responsibility ...
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My question is regarding using private type in F#. Consider the case we have some application and we have some library. One may consider using units within the library, and making them private behind ...
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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)...
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I'm writing a parser for a markup language in haskell, and a finite state machine fell out of my ideal API. I have code that looks a bit like this: Token = BoldWord String | Word String | ...
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In Python, consider a function like the following: def main(*args): value1 = pure_function1(*args) if condition(value1): value = side_effect1(value1) if value: ...
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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 ...
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I am working on an algorithm that optimizes utilitization of a vehicle. What I have is a list of paths the vehicle is planned to take and between which times (time windows) it has to be at a certain ...
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I am developing a utils data engineering package in python, and for the sake of reusability and readability, I chose the functional programming (FP) approach. Assume a key task of converting data from ...
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I am trying to find a good way of allowing two objects that are separated by a intermediate object to communicate while keeping the architecture loosely coupled. A solution I have developed is to pass ...
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A customer of ours has a rather large (500+ LOC) service as central part of the project. Written in C# and consisting of rather clunky large imperative style functions, I was asked to improve the test ...
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I'm searching for any formal/generic approach to modeling a process distributed in time with functional programming. Here is an example. Let's implement a very simple notification service. It accepts ...
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In short, "functional core, imperative shell" can be summarized as: functional core implements logic; you unit test it. Your tests call real functions just like in production real functions ...
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I need to create a program with the purpose of cross-referencing personal info from a spreadsheet(s), to check for conflicts of interest between clients of 3 different law firms. All of this client ...
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Given the following hypothetical programming language: Intended for practical programming A simply typed lambda calculus (STLC) All objects are functions, based on Church encodings I am aware that ...
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I'm interested in becoming more familiar with functional programming as a paradigm, so I'm trying to introduce a more functional style to some of my projects. I'm struggling to understand how to ...
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I'm trying to understand whether the Haskell and C++ communities mean different things by the word "functor", or if there's some underlying concept that unifies the two meanings. My ...
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