Recent questions tagged f#

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f# - Why use a Backward Pipe Operator instead of Function Chaining?

Why use a backward pipe operator instead of a function chaining? let distanceFromOrigin aPoint = let square x = x ... .x + square aPoint.y See Question&Answers more detail:os...

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

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f# - Updating nested immutable data structures

I want to update a nested, immutable data structure (I attached a small example of a hypothetical game.) ... .Update levelFunc2 dungeon2.Print() See Question&Answers more detail:os...

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

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f# - What's a functional replacement for if-then statements?

I've been learning F# and functional programming and trying to do things the functional way. However, when it ... make the code more functional. See Question&Answers more detail:os...

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

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f# - Difference between fold and reduce?

Trying to learn F# but got confused when trying to distinguish between fold and reduce. Fold seems to do the same ... [2; 4; 10]) See Question&Answers more detail:os...

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

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f# - Explaining pattern matching vs switch

I have been trying to explain the difference between switch statements and pattern matching(F#) to a couple of ... mark multiple right answers. See Question&Answers more detail:os...

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

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443 views

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f# - What are advantages and disadvantages of "point free" style in functional programming?

I know that in some languages (Haskell?) the striving is to achieve point-free style, or to never explicitly ... style are. Can anyone explain? See Question&Answers more detail:os...

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

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f# - make function work with all numeric types (int, float, long)

this simple function: let sum a b = a + b will work only for int types how to make it so that it would also work for float and long ? See Question&Answers more detail:os...

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

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f# - OCaml performance of exceptions

I've often read that exceptions are somewhat slow and should be avoided if performance is an issue ( ... function negatively impact performance? See Question&Answers more detail:os...

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

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f# - Keeping partially applied function generic

Is it possible to partially apply a function such as bprintf and prevent it from being restricted based on its ... 10 append "%s" string_value See Question&Answers more detail:os...

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

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f# interactive - F#/C# - fsx Script Files and Project References

You have a solution with one C# project in it. SomeComp.Framework is the name. You add a F# project to ... being located inside a F# project? See Question&Answers more detail:os...

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

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f# - How to access protected member

I have following code in extending type (in F#) which invokes a protected method of a class it inherits ... pr = this.ConstructPageReference(id) See Question&Answers more detail:os...

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

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f# - Why is None represented as null?

CompilationRepresentationFlags.UseNullAsTrueValue can be used to Permit the use of null as a representation for nullary ... in the latter. See Question&Answers more detail:os...

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

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f# - Eliminating my explicit state passing via like, monads and stuff

I'm working through the book Land of Lisp in F# (yeah weird, I know). For their first example text adventure, they ... for it in F# out there.) See Question&Answers more detail:os...

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

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f# 3.0 - Is there a way to install F# 3.0 without Visual Studio?

I was hoping to upgrade to F# 3.0 but I can't find either a packaged F# 3.0 compiler on Microsoft site, nor if ... a simple IDE and if so, how? See Question&Answers more detail:os...

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

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f# - Cannot resolve dependency to assembly FSharp.Core 4.4.1.0 when using VS 2017

I have been developing in VS 2015 and F# 4.0 (4.4.0.0) for quite some time. With the release of VS ... I double checked. Why is this happening? See Question&Answers more detail:os...

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

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534 views

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f# - This expression should have type 'unit', but has type 'ConsoleKeyInfo'

I just wanted to pause in an F# console application, so I wrote: Console.ReadKey() But this gives the warning: This ... can I do to fix this? See Question&Answers more detail:os...

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

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f# - Looking for robust, general op_Dynamic implementation

I've not been able to find a robust, general op_Dynamic implementation: can anyone point me to one? So far ... s abilities are false). Thanks! See Question&Answers more detail:os...

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

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f# 3.0 - groupby multiple columns in a F# 3.0 query

Just trying out F# 3.0 and hit a bit of a wall when it comes to grouping by multiple columns. The obvious ... I get the exact same exception. See Question&Answers more detail:os...

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

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f# - Functional programming and multicore architecture

I've read somewhere that functional programming is suitable to take advantage of multi-core trend in computing ... and von neumann architecture? See Question&Answers more detail:os...

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

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f# - Object initialization syntax

I'm just starting out with F# and I can't find the syntax to do object initialization like in C# 3. I.e. ... "John", BirthDate = DateTime.Now }; See Question&Answers more detail:os...

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

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486 views

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f# - How do I define y-combinator without "let rec"?

In almost all examples, a y-combinator in ML-type languages is written like this: let rec y f x = f (y f) x ... in F# without using let rec ...? See Question&Answers more detail:os...

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

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f# - Static extension methods supporting member constraints

I need to implement a static extension method supporting member constraints on some basic primitive types like ... missing here? Thanks! See Question&Answers more detail:os...

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

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f# - How this type annotation works, and why the other one does not?

Please explain the magic behind drawShape function. 1) Why it works at all -- I mean how it calls the Draw member, ... = ... Thanks in advance. See Question&Answers more detail:os...

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

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f# - Implementing the same interface at different generic instantiations

In C#, I can implement a generic interface twice on one class, using two different type-parameters: interface ... an upcoming release of F#? See Question&Answers more detail:os...

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

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361 views

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f# - How can I implement a tail-recursive list append?

A simple append function like this (in F#): let rec app s t = match s with | [] -> t | (x:: ... rather odd. Is there a more elegant definition? See Question&Answers more detail:os...

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

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559 views

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f# - Create Discriminated Union Case from String

I'm trying to create DU cases from strings. The only way I can see doing this is by enumerating over the DU cases ... not find keyword: " + l ] See Question&Answers more detail:os...

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

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560 views

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f# - Task Parallel Library vs Async Workflows

I have some stuff written in c# that executes concurrent code, making heavy use of the Task Parallel Library (Task ... programs in F# to share? See Question&Answers more detail:os...

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

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f# - Pretty print a tree

Let's say I have a binary tree data structure defined as follows type 'a tree = | Node of 'a tree * 'a ... my tree to output in that format? See Question&Answers more detail:os...

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

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