F# 4.0 發布，標準化 Array, List 和 Seq 模塊

Visual F# 4.0 發布，此版本現已提供下載：

https://www.visualstudio.com/downloads/download-visual-studio-vs。

F# 4.0 包含新的語言特性：

• 構造函數作為一級函數

• 可變值的使用簡化

• 支持高維的數組

• 支持方法中的靜態參數

• 簡化列表的語法

• 簡化 printf 函數的使用

• GC 優化提升性能

API 改進：

• 標準化和擴展 Array, List 和 Seq 模塊

• New APIs for 4.0: chunkBySize, contains, except, findBack, findInstanceBack, indexed, item, mapFold, mapFoldBack, sortByDescending, sortDescending, splitInto, tryFindBack, tryFindIndexBack, tryHead, tryItem, tryLast

• 其他新 API

• Option.filter, Option.toObj, Option.ofObj, Option.toNullable, Option.ofNullable

• String.filter

• Checked.int8, Checked.uint8

• Async.AwaitTask (non-generic)

• WebClient.AsyncDownloadFile, WebClient.AsyncDownloadData

• tryUnbox, isNull

</ul>

其他值得關注的改進：

• New active pattern to match constant Decimal in quotations

• Slicing support for lists

• Support for consuming high-rank (> 4) arrays

• Support for units of measure in printf-family functions

• Support for constructors/class names as first-class functions

• Improved exception stack traces in async code

• Automatic mutable/ref conversion

• Support for static arguments to provided methods

• Support for non-nullable provided types

• Added NonStructuralComparison module containing non-structural comparison operators

• Support for rational exponents in units of measure

• Give fsi.exe, fsiAnyCpi.exe nice icons

• Microsoft. optional in namepsace paths from FSharp.Core

• Support for extension properties in object initializers

• Pre-support (not yet used) for additional nativeptr intrinsics

• Simplified, more robust resolution of type references in quotations

• Support for inheritance of types that have multiple interface instantiations

• Extended preprocessor grammar

• Support for implicit quotation of expressions used as method arguments

• Support for multiple properties in [<StructuredFormatDisplay>]

• Eliminate tuple allocation for implicitly returned formal arguments

• Perf: fsc.exe now uses GCLatencyMode.Batch

• Perf: Improved hash/compare/distinctBy/groupBy performance

• Perf: Seq.toArray perf improvement

• Perf: Use OptimizedClosures.FSharpFunc in seq.fs where applicable

• Perf: Use literals and mutable variables instead of ref cells for better performance in SHA1 calc

• Perf: Use smart blend of System.Array.Copy and iterative copy for array copies

• Perf: Change Seq.toList to mutation-based to remove reliance on List.rev

• Perf: Change pdbClose to test if files are locked before inducing GCs

• Perf: Use server GC mode for compiler

Visual Studio 方面的改進：

• Updated all templates (except tutorial) to include AssemblyInfo.fs setup in the same manner as default C# project templates

• Add keyboard shortcuts for FSI reset and clear all

• Improved debugger view for Map values

• Improved performance reading stdout/stderr from fsi.exe to F# Interactive window

• Support for VS project up-to-date check

• Improved project template descriptions, make it clearer how to target Xamarin platforms

• Intellisense completion in object initializers

• Add menu entry "Open folder in File Explorer" on folder nodes

• Intellisense completion for named arguments

• Alt+Enter sends current line of code to interactive if there is no selection

• Support for debugging F# scripts with the VS debugger

• Add support for hexadecimal values (like 0xFF) ??to MSBuild property BaseAddress

• Updated menu icons used for F# interactive to align with other VS interactive windows

此外還有寫 bug 修復，詳細改進內容請看更新日志。

F#是由微軟發展的為微軟.NET語言提供運行環境的程序設計語言，是函數編程語言（FP，Functional Programming），函數編程語言最重要的基礎是Lambda Calculus。它是基于OCaml的，而OCaml是基于ML函 數程式語言。有時F# 和 OCaml 的程式是可以交互編譯的。

F#已經接近成熟，支援Higher-Order Function、Currying、Lazy Evaluation、Continuations、Pattern Matching、Closure、List Processing、Meta-Programming。這是一個用于顯示.NET在不同編程語言間互通的程序設計，可以被.NET中的任意其它代碼編 譯和調用。

F#將被集成在Visual Studio 2010中，含有對.Net Framework的完全支持。

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