All Questions
Tagged with functional-programming programming-practices
18 questions
1
vote
3
answers
442
views
Scala Option vs. conditional branches
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 ...
- 1,359
4
votes
2
answers
1k
views
How to organize a chain of functions that share parameters, functional programming
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 ...
- 423
7
votes
1
answer
6k
views
Is there a UML diagram for functional programming?
For modelling software implemented with the imperative or procedural programming paradigm we have Flowcharts, process diagrams, etc.
For object oriented we have UML class diagrams, object diagrams, ...
- 107
-1
votes
3
answers
175
views
How do you enforce rules for the members of a collection in a non-OOP way?
When everything seems to be a collection, how do you enforce rules for members of said collection without the use of an interface?
As far as I am aware, in languages that don't fully support OOP ...
- 647
1
vote
3
answers
246
views
What is a good method/practice I can employ to keep identical code snippits in two places in sync? Also, help documenting functionals
If I could get some input on the design of this, I would be grateful as well.
Note that I'm programming in python.
There's a function F that takes lots of data, runs some analysis on it (taking ...
- 165
12
votes
6
answers
2k
views
Best Practice - Wrapping if around function call vs Adding early exit if guard in function
I know this can be very use-case specific, but I find myself wondering this far too often. Is there a generally preferred syntax.
I'm not asking what is the best approach when in a function, I am ...
- 231
5
votes
3
answers
2k
views
In functional programming, what it means "Order of evaluation does not matter" when function is pure?
In context of pure functions in FP, apart from several benefits mentioned like easy to reason about, testability it also says "order of evaluation does not matter" since output remains same for given ...
- 1,450
9
votes
7
answers
4k
views
what can go wrong in context of functional programming if my object is mutable?
I can see the benefits of mutable vs immutable objects like immutable objects take away lot of hard to troubleshoot issues in multi threaded programming due to shared and writeable state. On the ...
- 1,450
6
votes
3
answers
383
views
Can referential transparency be assumed when dealing with floating-point arithmetic?
A pure function is assumed to produce the same outputs given the same inputs. Suppose an (otherwise) side-effects free function computes with floating-point numbers. Due to numerical error, these ...
- 853
54
votes
11
answers
12k
views
"Easy to reason about" - what does that mean? [closed]
I have heard a lot of times when other developers use that phrase to "advertise" some patterns or developing best practices. Most of the time this phrase is used when you are talking about benefits of ...
- 3,166
12
votes
2
answers
1k
views
Haskell ways to the 3n+1 problem
Here is a simple programming problem from SPOJ: http://www.spoj.com/problems/PROBTRES/.
Basically, you are asked to output the biggest Collatz cycle for numbers between i and j. (Collatz cycle of a ...
64
votes
10
answers
31k
views
Why would a program use a closure?
After reading many posts explaining closures here I'm still missing a key concept: Why write a closure? What specific task would a programmer be performing that might be best served by a closure?
...
- 769
2
votes
1
answer
639
views
Should all functions be fully self-contained (is it bad practice to share a variable between functions)?
There are two ways to do the same thing (pseudo code)
Define databaseHandle in the parent function, and use it as a global in this scope:
function API() {
function openDatabase() {
return ...
- 143
13
votes
6
answers
3k
views
What Functional features are worth a little OOP confusion for the benefits they bring?
After learning functional programming in Haskell and F#, the OOP paradigm seems ass-backwards with classes, interfaces, objects. Which aspects of FP can I bring to work that my co-workers can ...
- 441
20
votes
3
answers
2k
views
Must I think about compiled machine code when I write my code?
For example I've got following code:
auto z = [](int x) -> int {
if (x > 0) {
switch (x) {
case 2: return 5;
case 3: return 6;
default: return 1;
...
- 1,904