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                `Lambda`表達式就是一個匿名函數,它是函數式編程的基礎,所謂函數式編程實際上就是一種編程范式。可以定義為四種方式: ## 1. 無參數 ~~~ fun doSomeTest_1(){ { println("Lambda表達式第一種寫法。") }() } ~~~ 結果: ``` Lambda表達式第一種寫法。 ``` ## 1.2 有參數 ~~~ fun doSomeTest_2(){ { a: Int, b: Int -> println("Lambda表達式第二種寫法。傳入參數a:${a}, b:${b}") }(4, 5) } ~~~ 結果: ``` Lambda表達式第二種寫法。傳入參數a:4, b:5 ``` ## 1.3 返回值 對于上面兩種寫法均沒有返回值,有些時候我們需要計算的結果,比如下面的案例: ~~~ fun main() { var a = 4 var b = 7 var sum = { a: Int, b: Int -> a * 10 + 7 }(a, b) println(sum) } ~~~ 結果: ``` 47 ``` 或者: ~~~ fun main() { var a = 4 var sum = { println(132) a * 10 + 7 }() println(sum) } ~~~
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