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                            stream的懶執行,你可以對其他集合應用view方法來得到類似的效果,該方法產出一個其方法總是被懶執行的集合.但是**view不會緩存數據**,每次都要重新計算

~~~
val view = (1L to 1000L).view.map(x => x).filter(x => x.toString.reverse == x.toString)
  println(view.mkString(" "))
# 到20的時候,計算下
  println(view(20))
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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