All Questions
Tagged with functional-programming scala
37 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
0
votes
2
answers
300
views
Trying to understand how this class representation truly represents Natural numbers in Scala
Following Martin Odersky's course on coursera - Functional Programming with Scala and I'm on Week 4 where we're learning about Types and Pattern Matching. In the video lecture, this is the ...
- 157
1
vote
2
answers
140
views
How can an iterative algorithm be controlled dynamically?
Suppose we need an iterative algorithm for mathematical optimisation. Each iteration takes a long and random time. After each iteration, a stopping condition is checked for the iterate x, based on ...
- 853
5
votes
1
answer
852
views
Is using Option#get really a bad idea here?
I'm working on a Scala project and Wartremover shows an error about Option#get usage in my code:
Option#get is disabled - use Option#fold instead
While I do understand how get should often be avoided,...
3
votes
1
answer
410
views
Dependencies between functions-only modules: hardcoding vs alternatives
In switching from a procedural background to "FP in the small, OO in the large" I'm grappling with the following problem. Suppose there're modules, each only containing numerical math functions ...
- 853
1
vote
1
answer
1k
views
Does dependency injection fly in the face of functional programming?
I have the following pure function (f2 and f3 are pure too):
class X {
def f1(arg: Type1): Type2 = {
val x = f2(arg)
val y = f3(x)
y
}
def f2...
def f3...
}
Now, I would like ...
- 129
1
vote
1
answer
117
views
Simplified API one case class vs robust and multi ADT case class? [duplicate]
Below are oversimplified examples, but I wonder which route to take what is the best practice when designing API, the simple or the more complex and robust which is better?
This looks good and goes ...
- 507
1
vote
1
answer
420
views
Modelling relational database entities in a functional language
I'm working on a Scala project that uses DynamoDB for persistence, and does this by modelling the records as case classes.
This is becoming increasingly more relational, which means we have classes ...
- 121
3
votes
2
answers
227
views
functional programming: impact of typedef-ing datatypes on code readability and maintenance
In functional programming languages, such as Scala, data types and structures, are really important. I am in two minds about the use of type-defs in helping with the readability of the code ...
- 283
3
votes
1
answer
1k
views
Should I pass all arguments to a method explicitly in functional programming?
I wonder whether a method in a functional programming language should receive all variables from the argument list, or whether it is ok to use variables from the outer scope?
But let me explain the ...
- 139
4
votes
1
answer
672
views
Scala Callback Pyramid of Doom
I would like to solicit some general design principles and best practices to avoid creating a callback pyramid of doom particularly in the Scala language.
Consider the following rudimentary and ...
- 727
1
vote
2
answers
136
views
Type of map for Try[T]
I was looking at the type of map for Try[T] in Scala, which is:
def map[S](f: T=>S): Try[S]
From Haskell, I am used to the type of map being:
map :: (a->b)->[a]->[b]
This seems very ...
- 173
7
votes
3
answers
3k
views
Should databases be viewed as Monads?
Because any kind of persistence updates/inserts/deletes represents in some sense a kind of state change in a database, it makes me wonder whether databases can be considered monads. We say the same ...
- 431
69
votes
4
answers
13k
views
Is functional programming faster in multithreading because I write things differently or because things are compiled differently?
I'm diving into the world of functional programming and I keep reading everywhere that functional languages are better for multithreading/multicore programs. I understand how functional languages do a ...
- 801
2
votes
1
answer
877
views
Why use tuples as function parameters in languages that support currying?
In languages that support currying, I can't think of many cases where using a tuple as function input parameters would be better than breaking the tuple apart into multiple parameters, which then ...
- 791