What’s new in the F# programming language

The main behavioral change makes F# tuple types and System.Tuple types completely synonymous

With this week’s release of Visual Studio 2017 15.6, Microsoft has made foundational changes to the F# language and core library. F# is a Microsoft-developed, strongly typed language positioned as being “functional-first.”

The main behavioral change makes F# tuple types and System.Tuple types completely synonymous. As a result, a warning is presented when developers acces .Item and .Rest properties from a system tuple. This changes fixes inconsistencies in how the two types interact and repairs a regression that was introduced in Visual Studio 2017 15.4.

Other changes include:

  • F# project support for .Net Core SDK-based projects now have full file-ordering and folder support.
  • The F# library, FSharpCore, has the IsSerializable property on F# types for the .Net Standard version of the library. The library also supports the Async.StartImmediateAsTask function.
  • A change in versioning enables tools to align with multiple release trains for different products, rather than artificially aligning with an F# language version. The language, the FSharpCore binary, and the FSharpCore package will use the same versioning scheme. To enable this alignment, the F# language version will jump from 4.1 to 4.5 when Visual Studio 2017 15.7 ships.

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