F# 4.0 发布，标准化 Array, List 和 Seq 模块

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　　Visual F# 4.0 发布，此版本现已提供下载：
　　https://www.visualstudio.com/downloads/download-visual-studio-vs。
　　F# 4.0 包含新的语言特性：

• 　　构造函数作为一级函数
  
• 　　可变值的使用简化
  
• 　　支持高维的数组
  
• 　　支持方法中的静态参数
  
• 　　简化列表的语法
  
• 　　简化 printf 函数的使用
  
• 　　GC 优化提升性能
  

　　API 改进：

• 　　标准化和扩展 Array, List 和 Seq 模块
  
  
  
  • 　　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
    
  
  

　　其他值得关注的改进：

• 　　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 []
  
• 　　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>List.rev
  
• 　　Perf: Change pdbClose to test if files are locked before inducing GCs
  
• 　　Perf: Use server GC mode for compiler
  

　　Visual Studio 方面的改进：

• 　　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
  

　　此外还有写 bug 修复，详细改进内容请看更新日志。
　　F#是由微软发展的为微软.NET语言提供运行环境的程序设计语言，是函数编程语言（FP，Functional Programming），函数编程语言最重要的基础是Lambda Calculus。它是基于OCaml的，而OCaml是基于ML函 数程式语言。有时F# 和 OCaml 的程式是可以交互编译的。
　　F#已经接近成熟，支援Higher-Order Function、Currying、Lazy Evaluation、Continuations、Pattern Matching、Closure、List Processing、Meta-Programming。这是一个用于显示.NET在不同编程语言间互通的程序设计，可以被.NET中的任意其它代码编译和调用。
　　F#将被集成在Visual Studio 2010中，含有对.Net Framework的完全支持。