Recent questions tagged Functional

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functional programming - Scala - Two Lists to Tuple List

Last year I had quite a bit of experience with standard ML, but I haven't done any real functional ... searching for Scala zip functions.) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Iterate over all pair combinations without repetition in Haskell

In haskell, given a list of elements, xs, the simplest way to iterate over all pair permutations with ... usage of a filtering condition) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Setting up diagnostic error messages in large Mathematica projects

Whenever I create a large Mathematica project I run into this problem: Preventing avalanche of runtime errors in ... be done simplifying it. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Apply several string transformations in scala

I want to perform several ordered and successive replaceAll(...,...) on a string in a functional way in scala ... solution ? Scalaz welcome ! ;) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - In Haskell, why non-exhaustive patterns are not compile-time errors?

This is a follow-up of Why am I getting "Non-exhaustive patterns in function..." when I invoke ... -exhaustive patterns are helpful/legitimate? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Does Scala have guards?

I started learning scala a few days ago and when learning it, I am comparing it with other functional ... guards with otherwise and all? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Implementing a tail recursive version of quicksort-like function in F#/OCaml

Is it possible to implement a tail recursive version of the quick sort algorithm (via the continuation pattern)? And ... or equal to pivot`` See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Standard ML functor examples

Functors in Standard ML are related to the module system and can generate structures based on other structures. ... = ListComb (ConcatList) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Apply list of functions on an object in Python

Is there any clean way to apply a list of functions on an object in Python without lambda or list ... something from operator or itertools? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - What's the difference between "equal (=)" and "identical (==)" in ocaml?

In OCaml, we have two kinds of equity comparisons: x = y and x == y, So what's exact the difference ... y (comparing the address) in Java? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Scala way to program bunch of if's

I'm starting out with scala, and trying to apply the functional way to it, but I came out with bunch of ... more functional and more scala like? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - What is the "pin" operator for, and are Elixir variables mutable?

Currently trying to understand the "^" operator in Elixir. From the website: The pin operator ^ can be used when ... getting used to that... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - How should I think about Scala's Product classes?

The package "scala" has a number of classes named Product, Product1, Product2, and so on, up to Product22 ... ' "projection" members indicate? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Haskell pattern matching - what is it?

What is pattern matching in Haskell and how is it related to guarded equations? I've tried looking for a ... concept. Pure out of interest. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - What is the Zipper data structure and should I be using it?

The question is simple: I cannot understand the Zipper data structure. My question is related to its uses with a ... just cannot see the way? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Clojure head retention

I'm reading Clojure Programming book by O'Reilly.. I came across an example of head retention. First example ... gets retained in which case? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - higher level functions in R - is there an official compose operator or curry function?

I can create a compose operator in R: `%c%` = function(x,y)function(...)x(y(...)) To be used like this: ... - has this already been done for R? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Dynamic dispatch in Haskell

Programs written in, for example, Java rely a lot on dynamic dispatch. How are such programs expressed in ... underneath "dynamic dispatch"? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - How to compose functions in Rust?

I'm trying to write a function that composes two functions. The initial design is pretty simple: a function that takes two ... 7 | | } | |_^ See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Using car and cdr

I am new to scheme and having a hard time with using car and cdr. I have an AST string literal in ast. (define ... , 'while, 'if, and 'call. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Javascript Function.prototype.call()

I read some article and it said the following 2 line are doing the same thing. fn.call(thisValue); Function. ... hack the line 2 is doing. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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575 views

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functional programming - non recursive lambda calculus factorial function

How to write a factorial function without use of recursion using lambda calculus? Meaning just the math ... particular programming language. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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534 views

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functional programming - List[Try[T]] to Try[List[T]] in Scala

I would like to know how to convert a List[Try[T]] into Try[List[T]] in Scala? I have tried using an ... right but it doesn't seem ideal. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - Higher order functions in C

Is there a "proper" way to implement higher order functions in C. I'm mostly curious about things like portability ... do this some other way. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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functional programming - zipWith (mapping over multiple Seq) in Scala

Suppose I have val foo : Seq[Double] = ... val bar : Seq[Double] = ... and I wish to produce a seq where ... really the 'right' way to do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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547 views

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functional programming - Clojure lazy sequence usage

I'm having trouble understanding how one creates a lazy sequence in Clojure. The documentation for the macro isn' ... take this general form? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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549 views

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functional programming - tail recursion vs. forward recursion

Can someone give me the difference between these two kinds recursions and example (specifically in OCaml)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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454 views

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functional programming - Why are there primitive functions like DoubleFunction in Java 8

I just had a look at the the new Java 8 function package and wonder why there are interfaces like DoubleFunction ... seem to be much longer See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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