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F#6 of Microsoft upgrades ease performance

William Tsu
Data Analyst
Experienced data analyst working with data visualization, cloud computing and ETL solutions.
November 15, 2021

F# 6, an advance to Microsoft’s open source, multi-paradigm, programming language, is currently available. The new version promises to make F# simpler and boost performance, ranging from the language design, tooling and library, with the primary objective of demounting unnecessary hurdles on the path to adoption. F# strongholds multiple programming models including functional, object-oriented, and indispensable.

The new version brings a wealth of new features and is more uniform and interoperable with other .NET languages. According to Microsoft, F# 6 will ship with .NET 6 RC2 and Visual Studio 2022 RC2, and functions as the next phase to make it simpler for users to write robust, succinct, and performant code. And conceivably, the major technical specification in F# 6 remains authoring non-synchronous tasks more performant, and interoperability with other .NET languages like C#.

F#6 of Microsoft upgrades ease performance

What’s New in Microsoft’s F# 6?

F# 6 stipulates the characteristic “overloaded custom operations in computation expressions” which since F# 5.0 has been in the premiere; the quality permits for easier DSLs in F# encompassing for web programming and validation.

While F# comprises active patterns quality that permits users enlarge pattern matching in impulsive ways, with F# 6, the feature has been magnified with optional strict illustrations for active patterns. Furthermore; in F# 6, the “as” pattern can now itself be a pattern, which is significant when a typing test has given a stronger type to an input. The in-memory cross-project mentioning feature makes simpler working between C# projects, as it permits C# projects to ponder instantly in an F# project without recompiling the C# project on disk.

Furthermore, F# developers have the advantage of .NET 6 developments to gratify packaging regulations for generally used Linux distributions, and profile-guided optimization, can assemble startup code with reduce binary size, at premium quality, and restructure application binaries so that code used at startup is forgathered at the begin of the file.

Making F# quicker and more interoperable with task {…}

One of the most demanded features for Microsoft F#6 – and the most important technical feature in this release – has been to make creating asynchronous tasks easier, more performant, and more inter-operating with other .NET languages like C#. Hitherto, creating .NET tasks needed using async {…} to make a task and then summon it with Async.AwaitTask. With Microsoft F# 6 you can now use task {…} instantly to create the task and wait for it.

Making F# easier to learn: indexing with expr[idx]

To make Microsoft F# easier to discover, the project is permitting the syntax expr[idx] to slicing syntax. This syntax was on the basis of an equivalent notation used in OCaml for string indexed lookup. By permitting the use of expr[idx] is on the basis of repeated response from those learning F# or seeing F# for the first look that the use of dot-notation indexing comes across as a needless deviation from standard industry practice. There is no reason for F# to diverge here.

Making F# quicker: Struct representations for partial active patterns

F# comprises the active patterns feature that permits users to enlarge pattern matching in instinctive and effective ways. In Microsoft F# 6, amplified that feature with optional Struct representations for partial active patterns.

Making F# more consistent: “as” patterns

In Microsoft F# 6, the right hand side of an “as” pattern can now itself be a pattern. In every pattern case the input object is type-tested. The right-hand-side of the “as” pattern is now permitted to be a further pattern which can itself match the object at the powerful type.

Making F# quicker: improved performance and debugging for a list and array expressions.

For quick, F# 6 exhibits improved performance for debugging for list and array expressions. Also for speed, a new indicative feature has been added that permits code to optionally denote that lambda arguments should be inlined at call sites.

Making F# simpler:.NET-style implicit conversions

“First-class” encourage is provided for .NET-style implicit conversions. In Microsoft F# 6, op.Implicit conversions are exerted instinctively for argument expressions when they are accessible and the types are known for the source expression and target type.

This modification achieves three things.

• lesser explicit upcasts are required

• lesser explicit integer conversions are required

• First-class encourage for .NET-style implicit conversions is added

F# tooling: presentation and Scalability

In Microsoft F# 6, developers have made impressive improvements to Compiler/IDE-tooling perf/scalability developments in both the core execution of the language and the Visual Studio components.

• The Microsoft F# compiler now accomplishes the parsing phase in parallel, ensuing in approximately 5 percent performance development for large projects.

• Analysis conclusions are now performed concurrently. When working in the IDE, analysis requests are no more serialized through a single “reactor” compilation thread. Alternately, the F# Compiler Service is now concurrent. This extremely enhances performance in many occasions.

• Greater performance of analysis in F# projects that include signature files. If you are utilizing signature files in your project you will see prognostics and other review results much more quickly when an alteration is made to an implementation file without change to the signature file. This alteration was also embedded in the final releases of Visual Studio 2019.

• Find-all allusions are now performed simultaneously, in parallel across multiple projects.

• Major performance developments to “Close solution” and “Switch configuration”. For instance, some simple use cases have lowered “Close solution” from 16 seconds to 1 second.

F# tooling: In-memory cross-project referencing

In Microsoft F# 6, developers made operating between F# and C# projects easier and more trustworthy through “In-memory cross-project referencing” from F# to C#. This implies in C# projects are now pondered directly in F# project without having to compile the C# project on-disk. It also entails analysis results are accessible in uncompiled solutions.

Microsoft F# tooling: .NET Core the default for scripting

If you open or accomplish an F# Script (.fsx) in Visual Studio, by default the script will be examined and accomplished using .NET Core with 64-bit execution. This practicality was in preview in Visual Studio 2019 and is now authorized by default. To authorize.NET Framework scripting, you have to take Tools -> Options -> F# Tools -> F# Interactive and after that set Use .NET Core Scripting to false and restart the F# Interactive window. This configuration impacts both script editing and script execution.

F# tooling: In-memory cross-project referencing

One of the most demanded features in the Microsoft F# 6 toolchain is the addition of “Pipeline debugging”. Currently, the F# compiler transmits debug stepping points for every position in an F# pipeline comprising |>, ||> and |||> operators. At the starting of each step, intermediate phase of the pipeline can be inspected in a typical debugger.

Bringing F# forward: shortening use of rarely used symbolic operators

In Microsoft F# programming, “ref cells” can be used for heap-allocated mutable registers. While they are sometimes effective, in modern F# coding these is hardly ever wanted as let mutable can usually be used instead. The F# core library contains two operators: = and! And two functions incr and decr exclusively connected to reference calls. The charisma of these handlers builds reference cells more primary to F# programming than they oblige to be, requiring all F# programmers to be accustomed with these operators. Further, the ! operator can be simply bewildered with the not operation in C# and other languages, a potentially subtle source of bugs when translating code.

Consequently, in Microsoft F# 6 developers made a resolution to give soft guidance that de-normalizes the use of :=, !, incr and decr in F# 6 and besides. By these operators and functions will now give informational alerts asking you to reinstate your code with overt use of the Value property.

The rationale for this modify is to decrease the number of operators the F# programmer wants to be familiar with.

Making F# more consistent: Additional numeric types with unit annotations tags

Microsoft F#6 wires Units of Measure, permitting annotation tags to be attached to numeric types. On the other hand, in preceding version not all numeric types endorsed these annotations.

Prevailing Improvements in .NET 6

Microsoft F# 6 is bottomed on.NET 6, and F# programmers profit both instantly and not directly from a host of additional features and developments in the runtime. Some of these are listed below:

• Source build: a setting and infrastructure being created with Red Hat that is proposed to gratify packaging rules of usually used Linux distributions, such as Debian and Fedora.

• Profile guided optimization: this scenario is based on the hypothesis that code performed as part of a startup often is consistent and that upper level performance can be delivered by leveraging it.

• Interface casting performance has been enhanced by 16 % to 38 %.

• Code generation has been enhanced in RyuJIT via multiple modifications, to make the process more competent and run quickly.

• Single-file bundles encourage compression.


F# is designed as partnership between the .NET Foundation, the F# Software Foundation, their members and other contributors including great pioneer Microsoft. The F# community is concerned at all phases of improvement, plan, accomplishment and release and swollen with pride to be a contributing part of this community.