Recent questions tagged F#

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f# - Azure Function App: Can't bind Queue to type 'Microsoft.WindowsAzure.Storage.Queue.CloudQueue' (IBinder)

My scenario for an Azure function: HTTP trigger. Based on HTTP parameters I want to read messages from an appropriate ... ], "disabled": false } 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# - Can/does the (forward) pipe operator prevent tail call optimization?

For a parameter optimization problem at work I wrote a genetic algorithm to find some good settings because a brute- ... adding one more. :) 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# - MissingMethodException when testing a function that takes a function parameter

I am using FsUnit 2.1 (with NUnit 3.2) to write tests for an F# project. Here is a simple module: namespace ... If so, how can it be resolved? 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# - Array.create and jagged array

Can't understand the reason of such behavior: let example count = let arr = Array.create 2 (Array.zeroCreate ... didn't expect such results. 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# - In FsCheck, how to generate a test record with non-negative fields?

In F#, I have a record with a few fields: type myRecord = { a:float; b:float; c:float } I am using ... to do this. Can anyone supply guidance? See Question&Answers more detail:os...

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

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770 views

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f# - Void in constrast with Unit

I would like to understand which is the difference between these two programming concepts. The first represents the ... in an F# program). 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# - The mutable variable 'i' is used in an invalid way.?

I am attempting to write some simple code in F#, and i get this error: Error 1 The mutable variable 'i' is ... t it let me print the variable? See Question&Answers more detail:os...

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

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721 views

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f# - Block is unfinished

This code fragment is compiled: let test = let x = 1 printfn "%A" x If the last line is removed, ... , but F# gives something different. 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 Do I Use A Variable As The Formatting String With Sprintf?

I feel like a total noob for having to ask this but it's got me stumped. I set a format string ... the Xamarin Studio F# Interactive Window. 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# stackoverflow project euler #4

I'm working on problem four of Project Euler and am running into a stackoverflow exception. I'm not asking ... %A" (findPalindromes 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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823 views

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f# - Can this be expressed in point free style?

Given the following expression to sum an IEnumerable of numbers: let sum l = l |> Seq.reduce(+) //version ... generic, add a type annotation. 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# - Overloading measure operator (*)

I am stuck attempting to overload the (*) operator for a Measure type. What I would like to see is : > let ... type. What am I doing wrong? See Question&Answers more detail:os...

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

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572 views

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f# - How to partition a list with a given group size?

I'm looking for the best way to partition a list (or seq) so that groups have a given size. for ex. let's ... (maybe with a built-in function)? See Question&Answers more detail:os...

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

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544 views

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f# - Chunked Parsing with FParsec

Is it possible to submit input to an FParsec parser in chunks, as from a socket? If not, is it ... controlling the chunking in this scenario? See Question&Answers more detail:os...

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

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541 views

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f# - Parametric LINQ query

This is another take on accessing dynamic objects in F# There I'm using let y = x.Where(fun x -> x. ... maybe that is not the right approach. See Question&Answers more detail:os...

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

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647 views

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f# - Declaring a variable without assigning

Any way to declare a new variable in F# without assigning a value to 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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548 views

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f# - Example of the difference between List.fold and List.foldBack

My understanding of the difference between List.fold and List.foldBack is that foldBack iterates over its list in a reverse ... - 3 - 4 - 5 See Question&Answers more detail:os...

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

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888 views

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f# - Value of the last element of a list

how to get the value of the last element of a List? I've noted that List.hd (or .Head) return an item, ... the hd the only way around? 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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552 views

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f# - How to implement Singleton Pattern (syntax)

I have a cache of data which is getting refreshed from an outside source, and I want to limit my access tot ... pattern for this syntax in f#? See Question&Answers more detail:os...

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

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640 views

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f# - MailboxProcessor and exceptions

I wonder, why MailboxProcessor's default strategy of handling exceptions is just silently ignore them. For example ... for such behavior? See Question&Answers more detail:os...

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

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657 views

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f# - Haskell syntax for 'or' in case expressions

In F#, I can use | to group cases when pattern matching. For example, let rec factorial n = match n with ... s the Haskell syntax for the same? See Question&Answers more detail:os...

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

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681 views

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f# - Inline function and type extension

Consider I have two different library types: type Foo = { foo : string } type Bar = { bar : int32 } ... initial Foo and Bar type definitions? See Question&Answers more detail:os...

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

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702 views

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f# - Array2D to Array

I have Array2D of 0 and 1: let rnd = System.Random() let a = Array2D.init n n (fun i j -> int( ... a standard way to transform Array2D to Array? See Question&Answers more detail:os...

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

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581 views

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f# - Is it possible to enforce that a Record respects some invariants?

Suppose I wanted to create a Record type that represents acceptable min/max bounds: type Bounds = { Min: float ... have at least one character. See Question&Answers more detail:os...

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

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665 views

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f# - Compile-time constraint for complete pattern match

I'm looking for the warning number for incomplete pattern matches. Anyone know what it is? More fully, I want ... /dd233171(v=vs.140).aspx See Question&Answers more detail:os...

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

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593 views

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f# - Different argument order for getting N-th element of Array, List or Seq

Is there a good reason for a different argument order in functions getting N-th element of Array, List or Seq: ... notation with Array or List? See Question&Answers more detail:os...

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

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561 views

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f# keyword use and using

I am trying to use System.Data.Sqlite with F#. In C#, I have code like using (DbTransaction dbTrans = con ... how to close/delete my quesetions. See Question&Answers more detail:os...

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

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676 views

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f# - Could not load file or assembly FSharp.Core, Version=4.0.0.0

I'm trying to deploy a web application which uses F# 4.0 on Windows Server 2008. It works on my computer ... get something like this to work? See Question&Answers more detail:os...

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

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