Functional programming is a programming paradigm which primarily uses functions as means for building abstractions and expressing computations that comprise a computer program.
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0answers
33 views
Parsing command line args and executing a function in scala
I am trying to parse commandline arguments and execute a function that takes the parameters upon successful extraction of the parameters. I have an object called CurrencyExchangeRunner where the main ...
0
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0answers
26 views
Commercial usage and integrability of functional languages
I have a strong interest in functional languages, because they have so many advantages, but I don't know if they are really used in practice and how well they can be integrated into a mainstream Java, ...
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2answers
96 views
Is it possible to do that in Scala (without mutating the internal state of a class)?
Let's say, there is a class called RemoteIdGetter. It returns a key from a server. But it only makes a request to the server if the key is not "fresh" enough, meaning the last time it's been ...
-7
votes
1answer
37 views
Why it is not possible to index result of a function directly in Matlab? [closed]
Suppose I have some function which returns matrix. Let it be size function, but this is just an example.
>> size(lab)
ans =
1998 1999 3
so I can do
>> ...
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3answers
45 views
What is a functional-style replacement for this loop?
nums = [2 5 3 7]
result = []
result.push {x:nums[0]}
for n in nums.slice(1)
result.push {n:n + result[-1].x}
log result
# [{x:2} {x:7} {x:10} {x:17}]
This is hard to express functionally using ...
1
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4answers
55 views
my combinations function returns an empty list
I am working on S-99: Ninety-Nine Scala Problems and already stuck at question 26.
Generate the combinations of K distinct objects chosen from the N elements of a list.
After wasting a couple hours, I ...
0
votes
1answer
10 views
Using glmm_funs.R?
I am fitting a GLMM and I had seen some examples where is used the function: overdisp_fun, deļ¬ned in glmm_funs.R, but I don't know which package contain them or how can I call it from R, can somebody ...
1
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2answers
128 views
Functional way to implement a thread safe shared counter
I'm relatively new to Scala and functional programming, and I like the idea that using immutable objects I can avoid many thread safety pitfalls. One thing still haunts me, and it's the classical ...
12
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2answers
108 views
Haskell Pattern Matching Fails on Negative Number
The Haskell compiler throws an error on the following function:
balancedMax :: Int -> Int -> Int
balancedMax -1 _ = -1
balancedMax _ -1 = -1
balancedMax a b = max a b
Flipping the sign solves ...
0
votes
2answers
42 views
Scala Yield behaves differently than Scala Map
I trying to compose and initialize an Array in a single line, roughly equivalent to this:
var characterMap = new Array[List[ActorRef]](sizeX*sizeY)
characterMap.indices.foreach(characterMap(_) = ...
0
votes
0answers
43 views
Is any normalization of a function to a curried form considered currying?
I was reading a blog post about combining higher order functions and it provided a C# example of "currying".
The examples look like:
public static Func<T1, Func<T2, T3>> Curry<T1, T2, ...
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0answers
67 views
When is it appropriate to use functional features in an OO language? [closed]
I was recently asked this question by a new starter and was stumped to give a meaningful answer. When is it appropriate?
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3answers
68 views
recursion in ocaml nested lists
I am new to Ocaml and am writing code to substitute elements in nested Ocaml lists. My code is as follows:
type 'a sexp = S of 'a | L of 'a sexp list
My substitution function(it replaces all ...
0
votes
1answer
52 views
ocaml mutual recursion error
I am new to Ocaml and want help with recursive function defined on a recursive data type. I have defined a data type as follows
type 'a slist = S of 'a sexp list
and
'a sexp = Symbol of ...
2
votes
1answer
49 views
How do I convert a function into point free form?
Let's say I have a JavaScript function
function f(x) {
return a(b(x), c(x));
}
How would I convert that into a point free function? through composing functions? Also are there resources for more ...
