Kotlin 1.0 Beta 3 发布，基于 JVM 的编程语言

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　　Kotlin 1.0 Beta 3 发布，此版本主要是要完成标准库开发，还有移除一些废弃的语言结构。同时还有一些 bug 修复，性能提升。此版本包括库，语言，IDE 和 Android 扩展方面的改进和修复。详细改进内容请看发行说明。
　　改进列表：

• 　　Library
  
  
  
  • 　　increment deprecated in Progressions in favor of step property to Progressions, for-loops updated to refer to step
    
  • 　　contains() and other similar extensions now accept supertypes of the element of the collection
    
  • 　　Delegates.mapVal and mapVar, MapVal, MapVar, FixedMapVal, FixedMapVar are deprecated
    
  • 　　String.toCharArray() introduced instead of String.getChars(); String.toCharList() deprecated
    
  • 　　MutableCollection.removeAll(predicate: (T) -> Boolean) and similar for retainAll added
    
  • 　　sequence(initialValueFunction, nextValueFunction) doesn't evaluate first value until it's requested by sequence iterator
    
  • 　　sequenceOf(Progression) deprecated
    
  • 　　flatten operation for Sequence added
    
  
  
• 　　Langauge
  
  
  
  • 　　No references to PropertyMetadata are generated in the byte code
    
  • 　　Suffixes to numeric literals, such as 1baz are prohibited
    
  • 　　Comma-separated conditions in when without an argument are prohibited (KT-5143)
    
  • 
    　　Annotation>
    
  • 　　Arrays of annotations supported as annotation arguments (KT-10136)
    
  • 　　Generic types in catch clauses (including reified T) are prohibited (KT-9816)
    
  • 　　protected members are allowed in companion objects
    
  • 　　Calls to non-@JvmStatic protected members of companion objects from subclasses are marked as errors (unsupported)
    
  • 　　"…" is reserved as a token (KT-9708)
    
  • 　　Enum entry can not be used as a type (KT-5401)
    
  • 　　Enum.values is deprecated in favor of Enum.values()
    
  • 　　private setters are now deprecated for open properties
    
  • 
    　　Local sealed>
    
  • 　　Use of uninitialized variables in lambdas / object literals / local functions is forbidden
    
  • 　　Overriding setter cannot weaken visibility
    
  • 
    　　Inner>
    
  • 　　Implicit receiver smart casts are supported
    
  • 　　Older deprecations have become errors
    
  
  

　　下载：
　　
　　kotlin-compiler-1.0.0-beta-3595.zip
　　
　　Kotlin 是一个基于 JVM 的新的编程语言，由 JetBrains 开发。
　　其主要设计目标：

• 　　创建一种兼容Java的语言
  
• 　　让它比Java更安全，能够静态检测常见的陷阱。如：引用空指针
  
• 　　让它比Java更简洁，通过支持variable type inference，higher-order functions (closures)，extension functions，mixins and first-class delegation等实现。
  
• 　　让它比最成熟的竞争对手Scala语言更加简单。