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                * 閉包是依照包含自由變量的函數字面量在運行時創建的函數值 * 閉包是對函數本身及其所使用的自由變量的統一定義 ```scala val y=1 val add=(x:Int)=>x+y //add是閉包,y是自由變量 ``` * 閉包的變量綁定 * 閉包可捕獲自由變量的變化 ```scala var y = 9 val add = (x:Int) => x + y println(add(1)) // 10 y = 19 println(add(1)) // 20 ``` * 閉包對捕獲變量作出的改變在閉包之外也可見 ```scala y = 19 val change = (x:Int) => { y= y+x } change(1) println(y) // 20 ```
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