What's new in F# 6 - F# Guide (2023)

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F# 6 adds several improvements to the F# language and F# Interactive. It is released with .NET 6.

You can download the latest .NET SDK from the .NET downloads page.

Get started

F# 6 is available in all .NET Core distributions and Visual Studio tooling. For more information, see Get started with F#.

task {…}

F# 6 includes native support for authoring .NET tasks in F# code. For example, consider the following F# code to create a .NET-compatible task:

let readFilesTask (path1, path2) = async { let! bytes1 = File.ReadAllBytesAsync(path1) |> Async.AwaitTask let! bytes2 = File.ReadAllBytesAsync(path2) |> Async.AwaitTask return Array.append bytes1 bytes2 } |> Async.StartAsTask

Using F# 6, this code can be rewritten as follows.

let readFilesTask (path1, path2) = task { let! bytes1 = File.ReadAllBytesAsync(path1) let! bytes2 = File.ReadAllBytesAsync(path2) return Array.append bytes1 bytes2 }

Task support was available for F# 5 through the excellent TaskBuilder.fs and Ply libraries. It should be straightforward to migrate code to the built-in support. However, there are some differences: namespaces and type inference differ slightly between the built-in support and these libraries, and some additional type annotations may be needed. If necessary, you can still use these community libraries with F# 6 if you reference them explicitly and open the correct namespaces in each file.

Using task {…} is very similar to using async {…}. Using task {…} has several advantages over async {…}:

  • The performance of task {…} is much better.
  • Debugging stepping and stack traces for task {…} is better.
  • Interoperating with .NET packages that expect or produce tasks is easier.

If you’re familiar with async {…}, there are some differences to be aware of:

  • task {…} immediately executes the task to the first await point.
  • task {…} does not implicitly propagate a cancellation token.
  • task {…} does not perform implicit cancellation checks.
  • task {…} does not support asynchronous tailcalls. This means using return! .. recursively may result in stack overflows if there are no intervening asynchronous waits.

In general, you should consider using task {…} over async {…} in new code if you're interoperating with .NET libraries that use tasks, and if you don't rely on asynchronous code tailcalls or implicit cancellation token propagation. In existing code, you should only switch to task {…} once you have reviewed your code to ensure you are not relying on the previously mentioned characteristics of async {…}.

This feature implements F# RFC FS-1097.

Simpler indexing syntax with expr[idx]

F# 6 allows the syntax expr[idx] for indexing and slicing collections.

Up to and including F# 5, F# has used expr.[idx] as indexing syntax. Allowing the use of expr[idx] is based on repeated feedback from those learning F# or seeing F# for the first time that the use of dot-notation indexing comes across as an unnecessary divergence from standard industry practice.

This is not a breaking change because by default, no warnings are emitted on the use of expr.[idx]. However, some informational messages that suggest code clarifications are emitted. You can optionally activate further informational messages as well. For example, you can activate an optional informational warning (/warnon:3566) to start reporting uses of the expr.[idx] notation. For more information, see Indexer Notation.

In new code, we recommend the systematic use of expr[idx] as the indexing syntax.

This feature implements F# RFC FS-1110.

Struct representations for partial active patterns

F# 6 augments the "active patterns" feature with optional struct representations for partial active patterns. This allows you to use an attribute to constrain a partial active pattern to return a value option:

[<return: Struct>]let (|Int|_|) str = match System.Int32.TryParse(str) with | true, int -> ValueSome(int) | _ -> ValueNone

The use of the attribute is required. At usage sites, code doesn't change. The net result is that allocations are reduced.

(Video) What's New in F# 6

This feature implements F# RFC FS-1039.

Overloaded custom operations in computation expressions

F# 6 lets you consume interfaces with default implementations.

Consider the following use of a computation expression builder content:

let mem = new System.IO.MemoryStream("Stream"B)let content = ContentBuilder()let ceResult = content { body "Name" body (ArraySegment<_>("Email"B, 0, 5)) body "Password"B 2 4 body "BYTES"B body mem body "Description" "of" "content" }

Here the body custom operation takes a varying number of arguments of different types. This is supported by the implementation of the following builder, which uses overloading:

type Content = ArraySegment<byte> listtype ContentBuilder() = member _.Run(c: Content) = let crlf = "\r\n"B [|for part in List.rev c do yield! part.Array[part.Offset..(part.Count+part.Offset-1)] yield! crlf |] member _.Yield(_) = [] [<CustomOperation("body")>] member _.Body(c: Content, segment: ArraySegment<byte>) = segment::c [<CustomOperation("body")>] member _.Body(c: Content, bytes: byte[]) = ArraySegment<byte>(bytes, 0, bytes.Length)::c [<CustomOperation("body")>] member _.Body(c: Content, bytes: byte[], offset, count) = ArraySegment<byte>(bytes, offset, count)::c [<CustomOperation("body")>] member _.Body(c: Content, content: System.IO.Stream) = let mem = new System.IO.MemoryStream() content.CopyTo(mem) let bytes = mem.ToArray() ArraySegment<byte>(bytes, 0, bytes.Length)::c [<CustomOperation("body")>] member _.Body(c: Content, [<ParamArray>] contents: string[]) = List.rev [for c in contents -> let b = Text.Encoding.ASCII.GetBytes c in ArraySegment<_>(b,0,b.Length)] @ c

This feature implements F# RFC FS-1056.

“as” patterns

In F# 6, the right-hand side of an as pattern can now itself be a pattern. This is important when a type test has given a stronger type to an input. For example, consider the following code:

type Pair = Pair of int * intlet analyzeObject (input: obj) = match input with | :? (int * int) as (x, y) -> printfn $"A tuple: {x}, {y}" | :? Pair as Pair (x, y) -> printfn $"A DU: {x}, {y}" | _ -> printfn "Nope"let input = box (1, 2)

In each pattern case, the input object is type-tested. The right-hand side of the as pattern is now allowed to be a further pattern, which can itself match the object at the stronger type.

This feature implements F# RFC FS-1105.

Indentation syntax revisions

F# 6 removes a number of inconsistencies and limitations in its use of indentation-aware syntax. See RFC FS-1108. This resolves 10 significant issues highlighted by F# users since F# 4.0.

For example, in F# 5 the following code was allowed:

let c = ( printfn "aaaa" printfn "bbbb")

However, the following code was not allowed (it produced a warning):

let c = [ 1 2]

In F# 6, both are allowed. This makes F# simpler and easier to learn. The F# community contributor Hadrian Tang has led the way on this, including remarkable and highly valuable systematic testing of the feature.

This feature implements F# RFC FS-1108.

Additional implicit conversions

In F# 6, we've activated support for additional “implicit” and “type-directed” conversions, as described in RFC FS-1093.

This change brings three advantages:

  1. Fewer explicit upcasts are required
  2. Fewer explicit integer conversions are required
  3. First-class support for .NET-style implicit conversions is added

This feature implements F# RFC FS-1093.

Additional implicit upcast conversions

F# 6 implements additional implicit upcast conversions. For example, in F# 5 and earlier versions, upcasts were needed for the return expression when implementing a function where the expressions had different subtypes on different branches, even when a type annotation was present. Consider the following F# 5 code:

open Systemopen System.IOlet findInputSource () : TextReader = if DateTime.Now.DayOfWeek = DayOfWeek.Monday then // On Monday a TextReader Console.In else // On other days a StreamReader File.OpenText("path.txt") :> TextReader

Here the branches of the conditional compute a TextReader and StreamReader respectively, and the upcast was added to make both branches have type StreamReader. In F# 6, these upcasts are now added automatically. This means the code is simpler:

let findInputSource () : TextReader = if DateTime.Now.DayOfWeek = DayOfWeek.Monday then // On Monday a TextReader Console.In else // On other days a StreamReader File.OpenText("path.txt")

You may optionally enable the warning /warnon:3388 to show a warning at every point an additional implicit upcast is used, as described in Optional warnings for implicit conversions.

(Video) What's New in F# 6 0 - Don Syme - NDC Oslo 2021

Implicit integer conversions

In F# 6, 32-bit integers are widened to 64-bit integers when both types are known. For example, consider a typical API shape:

type Tensor(…) = static member Create(sizes: seq<int64>) = Tensor(…)

In F# 5, integer literals for int64 must be used:

Tensor.Create([100L; 10L; 10L])


Tensor.Create([int64 100; int64 10; int64 10])

In F# 6, widening happens automatically for int32 to int64, int32 to nativeint, and int32 to double, when both source and destination type are known during type inference. So in cases such as the previous examples, int32 literals can be used:

Tensor.Create([100; 10; 10])

Despite this change, F# continues to use explicit widening of numeric types in most cases. For example, implicit widening does not apply to other numeric types, such as int8 or int16, or from float32 to float64, or when either source or destination type is unknown. You can also optionally enable the warning /warnon:3389 to show a warning at every point implicit numeric widening is used, as described in Optional warnings for implicit conversions.

First-class support for .NET-style implicit conversions

In F# 6, .NET “op_Implicit” conversions are applied automatically in F# code when calling methods. For example, in F# 5 it was necessary to use XName.op_Implicit when working with .NET APIs for XML:

open System.Xml.Linqlet purchaseOrder = XElement.Load("PurchaseOrder.xml")let partNos = purchaseOrder.Descendants(XName.op_Implicit "Item")

In F# 6, op_Implicit conversions are applied automatically for argument expressions when types are available for source expression and target type:

open System.Xml.Linqlet purchaseOrder = XElement.Load("PurchaseOrder.xml")let partNos = purchaseOrder.Descendants("Item")

You may optionally enable the warning /warnon:3395 to show a warning at every point op_Implicit conversions widening is used at method arguments, as described in Optional warnings for implicit conversions.


In the first release of F# 6, this warning number was /warnon:3390. Due to a conflict, the warning number was later updated to /warnon:3395.

Optional warnings for implicit conversions

Type-directed and implicit conversions can interact poorly with type inference and lead to code that's harder to understand. For this reason, some mitigations exist to help ensure this feature is not abused in F# code. First, both source and destination type must be strongly known, with no ambiguity or additional type inference arising. Secondly, opt-in warnings can be activated to report any use of implicit conversions, with one warning on by default:

  • /warnon:3388 (additional implicit upcast)
  • /warnon:3389 (implicit numeric widening)
  • /warnon:3391 (op_Implicit at non-method arguments, on by default)
  • /warnon:3395 (op_Implicit at method arguments)

If your team wants to ban all uses of implicit conversions, you can also specify /warnaserror:3388, /warnaserror:3389, /warnaserror:3391, and /warnaserror:3395.

Formatting for binary numbers

F# 6 adds the %B pattern to the available format specifiers for binary number formats. Consider the following F# code:

printf "%o" 123printf "%B" 123

This code prints the following output:


This feature implements F# RFC FS-1100.

Discards on use bindings

F# 6 allows _ to be used in a use binding, for example:

let doSomething () = use _ = System.IO.File.OpenText("input.txt") printfn "reading the file"

This feature implements F# RFC FS-1102.


The F# compiler includes an optimizer that performs inlining of code. In F# 6 we've added a new declarative feature that allows code to optionally indicate that, if an argument is determined to be a lambda function, then that argument should itself always be inlined at call sites.

(Video) What’s New in F# 5.0 & Beyond • Don Syme • YOW! 2021

For example, consider the following iterateTwice function to traverse an array:

let inline iterateTwice ([<InlineIfLambda>] action) (array: 'T[]) = for j = 0 to array.Length-1 do action array[j] for j = 0 to array.Length-1 do action array[j]

If the call site is:

let arr = [| 1.. 100 |]let mutable sum = 0arr |> iterateTwice (fun x -> sum <- sum + x)

Then after inlining and other optimizations, the code becomes:

let arr = [| 1.. 100 |]let mutable sum = 0for j = 0 to array.Length-1 do sum <- array[i] + xfor j = 0 to array.Length-1 do sum <- array[i] + x

Unlike previous versions of F#, this optimization is applied regardless of the size of the lambda expression involved. This feature can also be used to implement loop unrolling and similar transformations more reliably.

An opt-in warning (/warnon:3517, off by default) can be turned on to indicate places in your code where InlineIfLambda arguments are not bound to lambda expressions at call sites. In normal situations, this warning should not be enabled. However, in certain kinds of high-performance programming, it can be useful to ensure all code is inlined and flattened.

This feature implements F# RFC FS-1098.

Resumable code

The task {…} support of F# 6 is built on a foundation called resumable code RFC FS-1087. Resumable code is a technical feature that can be used to build many kinds of high-performance asynchronous and yielding state machines.

Additional collection functions

FSharp.Core 6.0.0 adds five new operations to the core collection functions. These functions are:

  • List/Array/Seq.insertAt
  • List/Array/Seq.removeAt
  • List/Array/Seq.updateAt
  • List/Array/Seq.insertManyAt
  • List/Array/Seq.removeManyAt

These functions all perform copy-and-update operations on the corresponding collection type or sequence. This type of operation is a form of a “functional update”. For examples of using these functions, see the corresponding documentation, for example, List.insertAt.

As an example, consider the model, message, and update logic for a simple "Todo List" application written in the Elmish style. Here the user interacts with the application, generating messages, and the update function processes these messages, producing a new model:

type Model = { ToDo: string list }type Message = | InsertToDo of index: int * what: string | RemoveToDo of index: int | LoadedToDos of index: int * what: string listlet update (model: Model) (message: Message) = match message with | InsertToDo (index, what) -> { model with ToDo = model.ToDo |> List.insertAt index what } | RemoveToDo index -> { model with ToDo = model.ToDo |> List.removeAt index } | LoadedToDos (index, what) -> { model with ToDo = model.ToDo |> List.insertManyAt index what }

With these new functions, the logic is clear and simple and relies only on immutable data.

This feature implements F# RFC FS-1113.

Map has Keys and Values

In FSharp.Core 6.0.0, the Map type now supports the Keys and Values properties. These properties do not copy the underlying collection.

This feature is documented in F# RFC FS-1113.

Additional intrinsics for NativePtr

FSharp.Core 6.0.0 adds new intrinsics to the NativePtr module:

  • NativePtr.nullPtr
  • NativePtr.isNullPtr
  • NativePtr.initBlock
  • NativePtr.clear
  • NativePtr.copy
  • NativePtr.copyBlock
  • NativePtr.ofILSigPtr
  • NativePtr.toILSigPtr

As with other functions in NativePtr, these functions are inlined, and their use emits warnings unless /nowarn:9 is used. The use of these functions is restricted to unmanaged types.

This feature is documented in F# RFC FS-1109.

Additional numeric types with unit annotations

In F# 6, the following types or type abbreviation aliases now support unit-of-measure annotations. The new additions are shown in bold:

F# aliasCLR Type

For example, you can annotate an unsigned integer as follows:

(Video) F# for Performance-Critical Code, by Matthew Crews

[<Measure>]type dayslet better_age = 3u<days>

This feature is documented in F# RFC FS-1091.

Informational warnings for rarely used symbolic operators

F# 6 adds soft guidance that de-normalizes the use of :=, !, incr, and decr in F# 6 and beyond. Using these operators and functions produces informational messages that ask you to replace your code with explicit use of the Value property.

In F# programming, reference cells can be used for heap-allocated mutable registers. While they are occasionally useful, they're rarely needed in modern F# coding, because let mutable can be used instead. The F# core library includes two operators := and ! and two functions incr and decr specifically related to reference calls. The presence of these operators makes reference cells more central to F# programming than they need to be, requiring all F# programmers to know these operators. Further, the ! operator can be easily confused with the not operation in C# and other languages, a potentially subtle source of bugs when translating code.

The rationale for this change is to reduce the number of operators the F# programmer needs to know, and thus simplify F# for beginners.

For example, consider the following F# 5 code:

let r = ref 0let doSomething() = printfn "doing something" r := !r + 1

First, reference cells are rarely needed in modern F# coding, as let mutable can normally be used instead:

let mutable r = 0let doSomething() = printfn "doing something" r <- r + 1

If you use reference cells, F# 6 emits an informational warning asking you to change the last line to r.Value <- r.Value + 1, and linking you to further guidance on the appropriate use of reference cells.

let r = ref 0let doSomething() = printfn "doing something" r.Value <- r.Value + 1

These messages are not warnings; they are "informational messages" shown in the IDE and compiler output. F# remains backwards-compatible.

This feature implements F# RFC FS-1111.

If you open or execute an F# Script (.fsx) in Visual Studio, by default the script will be analyzed and executed using .NET 6 with 64-bit execution. This functionality was in preview in the later releases of Visual Studio 2019 and is now enabled by default.

To enable .NET Framework scripting, select Tools > Options > F# Tools > F# Interactive. Set Use .NET Core Scripting to false, and then restart the F# Interactive window. This setting affects both script editing and script execution. To enable 32-bit execution for .NET Framework scripting, also set 64-bit F# Interactive to false. There is no 32-bit option for .NET Core scripting.

F# tooling: Pin the SDK version of your F# scripts

If you execute a script using dotnet fsi in a directory containing a global.json file with a .NET SDK setting, then the listed version of the .NET SDK will be used to execute and edit the script. This feature has been available in the later versions of F# 5.

For example, assume there's a script in a directory with the following global.json file specifying a .NET SDK version policy:

{ "sdk": { "version": "5.0.200", "rollForward": "minor" }}

If you now execute the script using dotnet fsi, from this directory, the SDK version will be respected. This is a powerful feature that lets you "lock down" the SDK used to compile, analyze, and execute your scripts.

If you open and edit your script in Visual Studio and other IDEs, the tooling will respect this setting when analyzing and checking your script. If the SDK is not found, you will need to install it on your development machine.

On Linux and other Unix systems, you can combine this with a shebang to also specify a language version for direct execution of the script. A simple shebang for script.fsx is:

#!/usr/bin/env -S dotnet fsiprintfn "Hello, world"

Now the script can be executed directly with script.fsx. You can combine this with a specific, non-default language version like this:

#!/usr/bin/env -S dotnet fsi --langversion:5.0


(Video) A Brief Introduction to F#

This setting is ignored by editing tools, which will analyze the script assuming latest language version.

Removing legacy features

Since F# 2.0, some deprecated legacy features have long given warnings. Using these features in F# 6 gives errors unless you explicitly use /langversion:5.0. The features that give errors are:

  • Multiple generic parameters using a postfix type name, for example (int, int) Dictionary. This becomes an error in F# 6. The standard syntax Dictionary<int,int> should be used instead.
  • #indent "off". This becomes an error.
  • x.(expr). This becomes an error.
  • module M = struct … end . This becomes an error.
  • Use of inputs *.ml and *.mli. This becomes an error.
  • Use of (*IF-CAML*) or (*IF-OCAML*). This becomes an error.
  • Use of land, lor, lxor, lsl, lsr, or asr as infix operators. These are infix keywords in F# because they were infix keywords in OCaml and are not defined in FSharp.Core. Using these keywords will now emit a warning.

This implements F# RFC FS-1114.


What changed in F# 6? ›

In F# 6, we've activated support for additional “implicit” and “type-directed” conversions, as described in RFC FS-1093. This change brings three advantages: Fewer explicit upcasts are required. Fewer explicit integer conversions are required.

What's new in .NET 6? ›

NET 6 is the fastest full stack web framework, which lowers compute costs if you're running in the cloud. Ultimate productivity: . NET 6 and Visual Studio 2022 provide hot reload, new git tooling, intelligent code editing, robust diagnostics and testing tools, and better team collaboration.

Why is F# not popular? ›

This attitude towards the language by its very progenitor is one reason why F# has not yet become highly recognised for its suitability, beyond just data science, for both front end and back end development, while the barrier to its adoption continues to be cyclical: there are few jobs advertising for F# developers ...

What is the current version of F#? ›

F Sharp (programming language)
DeveloperMicrosoft, The F# Software Foundation
First appeared2005, version 1.0
Stable release7.0 / 8 November 2022
Typing disciplineStatic, strong, inferred
Influenced by
15 more rows

Which of the following is A new feature in C sharp 6? ›

Version 6 of the C# language continues to evolve the language to have less boilerplate code, improved clarity, and more consistency. Cleaner initialization syntax, the ability to use await in catch/finally blocks, and the null-conditional ? operator are especially useful.

Is F# good for machine learning? ›

F# excels at data science and machine learning. This article gives links to some significant resources related to this mode of use of F#. For information about other options that are available for machine learning and data science, see the F# Software Foundation's Guide to Data Science with F#.

Is .NET 6 better than .NET framework? ›

NET 6 can run on natively Mac and Linux, . NET Framework cannot and you would need a third-party runtime like Mono for that capability. . NET 6 you can compile the framework into your application so the separate framework does not need to be installed to run your app. .

What is the difference between .NET 6 and .NET 7? ›

NET 6 is a LTS (Long Term Support) release and will be supported with bug and security fixes for (has to look it up) 3 years. . NET 7 however is a STS (Short Term Support) release and will only be supported for 18 months (6 months beyond the release of . NET 8).

Is .NET 6 still core? ›

While support for . NET Core 3.1 ends in December 2022, support for . NET 6 will continue until November 2024.

What is F# best for? ›

F# is a universal programming language for writing succinct, robust and performant code. F# allows you to write uncluttered, self-documenting code, where your focus remains on your problem domain, rather than the details of programming.

Why is F# used in finance? ›

F# is a functional programming language that allows you to write simple code for complex problems. Currently, it is most commonly used in the financial sector. Quantitative finance makes heavy use of mathematics to model various parts of finance in the real world.

Why is C# better than F#? ›

The C# code has lots of “noise”, things like curly braces, semicolons, etc. And in C# the functions cannot stand alone, but need to be added to some class (“SumOfSquaresHelper”). F# uses whitespace instead of parentheses, needs no line terminator, and the functions can stand alone.

Is F# a good functional language? ›

F# makes it easy to write concise code to solve complex problems on all the major desktop and mobile platforms, primarily using functional programming. F# is a strongly typed, functional-first programming language that lets you solve complex problems by writing simple code.

Is F# slower than C#? ›

Asynchronous code (Tasks) in C# runs faster than in F# because the compiler supports them natively and generates optimized code. The difference may be reduced, once F# supports tasks natively, too.

Is F# good for web development? ›

F# excels at building efficient, scalable and robust web solutions. Web programming is based around receiving a single HTTP request and replying with a result, which maps very well to a stateless, functional approach.

Is C sharp outdated? ›

Is C# dying? No. Microsoft has invested substantially in ensuring that C# is the dominant language today, spending two billion dollars on marketing and attempting to convince developers to embrace this new platform, which is also based on the.NET foundation.

Is C Sharp still popular? ›

If you are wondering if C# is popular, yes, c# is very popular. In fact it is currently the fifth most popular and relevant language worldwide according to Tiobe Index ranking. Its great popularity has been built on a solid foundation of more than two decades. Thanks to Microsoft and the entire .

What is the latest update in C#? ›

NET. As of November 2022, the most recent stable version of the language is C# 11.0, which was released in 2022 in . NET 7.0.

Is F# used for data science? ›

F# is an excellent solution for programmatic data science as it combines efficient execution, REPL-scripting, powerful libraries and scalable data integration.

Is F# similar to Python? ›

F# is a functional programming language for . NET that is succinct (concise, readable, and type-safe) and kind of Pythonic. F# is in many ways very similar to Python, but F# can also do a lot of things better than Python: Strongly typed, if it compiles it usually works making refactoring much safer.

Does F# have lazy evaluation? ›

Lazy computation is a feature of F#. Lazy computation does not evaluate immediately. It is executed when result is needed. It can help to improve performance of your code.

Is .NET still relevant 2022? ›

NET Framework Trends 2022. The demand for . NET will continue to increase as long as new and better technologies are developed. For example, C# has been around for over a decade, but it's still one of the most popular programming languages on the market today.

Will .NET Framework be discontinued? ›

NET Framework 4.5. 2, 4.6, and 4.6. 1 retired on April 26, 2022. These specific releases were previously signed using Secure Hash Algorithm (SHA-1) certificates.

How much faster is .NET 6? ›

NET 6. “Typical” HTTP pipeline test (HttpClient hitting ASP.NET Core controller that hosts a CRUD style EF Core service) gets ~ 4.5% speedup.

Does .NET 6 replace .NET Framework? ›

NET 6 is a replacement for the legacy . NET Framework. Microsoft has no plans to port Web Forms, Windows Communication Foundation (WCF), or Windows Workflow Foundation (WF) from .

Should I upgrade to NET 6? ›

NET 6 is the far better choice between the two frameworks. It runs faster, produces more efficient code, and guarantees long-term support. As such, upgrading from .

Is .NET 7 production ready? ›

Now available in a production release, . NET 7 brings performance enhancements, a new version of C#, container and cloud-native tooling, and sweeping improvements to . NET MAUI and other . NET libraries and frameworks.

Is .NET 6 better than .NET Core? ›

The biggest highlight of . NET 6, though, is ASP.NET Core 6, a major upgrade of Microsoft's open source framework for building modern web applications. ASP.NET Core 6 is built on top of the . NET Core runtime and allows you to build and run applications on Windows, Linux, and macOS.

How long will .NET 6 be supported? ›

For example, .NET 6 was originally released on November 8, 2021 and is supported for three years. But the actual end of support day is the closest Patch Tuesday starting that date, which is November 12, 2024.

Does net 6 require visual studio 2022? ›

It is not supported with Visual Studio 2019, Visual Studio for Mac 8, or MSBuild 16. If you want to use . NET 6, you will need to upgrade to Visual Studio 2022 (which is also now 64-bit). . NET 6 is supported with the Visual Studio Code C# extension.

What is the major 6th of F sharp? ›

F sharp Major Scale Intervals

Perfect 4th – The 4th note of the scale is B. Perfect 5th – The 5th note of the scale is C#. Major 6th – The 6th note of the scale is D#. Major 7th – The 7th note is E#.

What is the minor 6th of F#? ›

The F#m6 chord (F sharp minor 6) contains the notes F#, A, C#, E and D#. It is produced by taking the 1 (root), b3, 5, 6 and b7 of the F# Major scale. The inclusion of the 6, adds a subtle jazz flavour to the minor chord. Here's how to play F#m6.

Why is F# and GB the same? ›

Technically a F# and a Gb are exactly the same, they just appear in different contexts. Hence is why if you take a look at the scales above, each note is the enharmonic equivalent of each other, so if you played an F# major scale out of context, it would be completely impossible to determine whether it was F# or Gb.

What are the features of F# that make it unique? ›

F# has numerous features, including:
  • Lightweight syntax.
  • Immutable by default.
  • Type inference and automatic generalization.
  • First-class functions.
  • Powerful data types.
  • Pattern matching.
  • Async programming.
Oct 13, 2022

What notes are in F 6 chord? ›

This chord is composed of the notes F, A, C, and D.

What music key has 6 sharps? ›

F# major

Is F sharp minor a thing? ›

F-sharp minor is a minor scale based on F♯, consisting of the pitches F♯, G♯, A, B, C♯, D, and E.

What notes are in the F# scale? ›

The notes of the F# Major scale are F# G# A# B C# D# E#. It's key signature has 6 sharps.

What keys go well with F# minor? ›

The following are a few common chord progressions in the key of F-sharp minor.
  • (Most common) I — IV—V—I: F# minor — B minor — C# minor — F# minor.
  • I — V — VI — IV: F# minor — C# minor — D — B minor.
  • I — VI — IV — V: F# minor — D — B minor — C# minor.
Dec 19, 2016

Is F# similar to Java? ›

F# and Java can be categorized as "Languages" tools. "Pattern-matching" is the primary reason why developers consider F# over the competitors, whereas "Great libraries" was stated as the key factor in picking Java. F# is an open source tool with 2.09K GitHub stars and 341 GitHub forks.

Is F# is faster than C#? ›

F# is a bit slower than C#, and C# can be optimized to be a bit faster, but that depends on which type of task you are running. But what you gain in speed with C# you lose in development ease and speed.


1. Scripting with F# Interactive [4 of 12] | F# for Beginners
2. F# Fundamentals Tutorial | Learn Functional Programming | Step-by-Step Guide
(Ben Gobeil)
3. What is F#? [2 of 12] | F# for Beginners
4. Functions, Pipelines & Composition [6 of 12] | F# for Beginners
5. Let's Learn .NET - F#
6. F# is awesome - learn what's new and what you can use it for! (Phillip Carter)
(Los Angeles Developers)


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