PureScript 0.7.0 "MELTDOWN" 发布

圣凤凌霜

腾讯SNG夏日招聘集结号：200个空缺岗位，JAVA、C++、云计算、Android……
　　PureScript 是个小巧而强大的静态类型语言，可以编译成 JavaScript。purescript 主要是由 Haskell 和 PureScript 编写的。
　　PureScript 0.7.0 ("MELTDOWN") 发布，主要是按照计划进行改进，在 1.0 之前简化升级路径。此最新的核心库已经更新编译到这个版本。旧版本的核心库已经不适用于这个版本，而且最新的库也不能使用旧的编译版本构建。
　　详细升级和迁移指导请看 wiki。
重要改进

• 　　psc 可执行已经使用 psc-make 替代，重命名为 psc (为了遵循 CommonJS 模块输出标准)
  
  
• 　　Int 和 Number 常量
  
• 　　Prelude 模块不再自动导入，必须以跟其他模块一样的方式导入
  
  
• 　　编译器不再包括模块，模块已经拆分到以下这些库：
  
  
  
  • 　　purescript-prelude
    
  • 　　purescript-eff
    
  • 　　purescript-st
    
  • 　　purescript-console
    
  • 　　purescript-functions
    
  
  
• 　　数组类型的 [] 语法已经被移除，但是还是可以使用 [] 数组常量
  
  
  
  • 　　[] should now be written as Array, and [a] as Array a.
    
  
  
• 　　Cons patterns for arrays have been removed.
  
• 　　Declaring operators in classes will now produce a warning. Changes will be coming to operators in PureScript 0.8, and moving to named members in classes with operators as aliases (e.g. () = map) should make the transition easier in the future.
  
• 　　JavaScript for the FFI can no longer be provided inline.
  
  
  
  • 　　Values must instead be provided in a separate .js file, and passed to the compiler with the -ffi flag.
    
  • 　　Values should be provided in the form exports.foo = ..., similar to a CommonJS module
    
  • 　　The file should have a comment // module X.Y.Z where X.Y.Z is the name of the module the JS values are for.
    
  • 　　See here for an example
    
  
  

功能增强

• 　　Module exports (@andyarvanitis). Currently, only full module exports are supported, but imported modules can be re-exported using the following syntax:purescriptmodule M1 (module M2) whereimport M2
  
• 　　Documentation improvements (@hdgarrood):
  
  
  
  • 　　psc-docs can now generate multiple output files, allowing documentation to be collected into functional groups.
    
  • 　　A new tool psc-publish has been added, which generates module documentation in a JSON format required by Pursuit 2 (coming soon)
    
  
  
• 　　@puffnfreshhas worked on dramatically increasing the performance of incremental builds, with improvements up to 10x compared to the previous release.
  
• 　　The new --require-path option allows the syntax of module imports in generated CommonJS modules to be customized (@garyb).
  
• 　　@etrepum has added support for building with Stack.
  
• 　　PSCi now supports computations in the Eff monad. (@paf31)
  
• 　　The compiler now emits warnings in the following cases:
  
  
  
  • 　　Operator name used in type class definition (@garyb)
    
  • 　　Type wildcard used (@nicodelpiano)
    
  • 　　Shadowed variable name (@paf31)
    
  
  
• 　　@balajirrao has improved the appearance of unknown and rigid types appearing in error messages.
  
• 　　@puffnfresh has added position information to pattern match errors.
  
• 　　@puffnfresh has added some new optimizations (inlining