scala語言示例

Scala | 任一關鍵字 (Scala | Either Keyword)

Either is a container similar to the option which has two values, they are referred to as children. The left and right children are named as the right child and left child.

這是一個類似于選項的容器，該容器具有兩個值，它們被稱為子級。 左邊的孩子和右邊的孩子分別命名為右邊的孩子和左邊的孩子 。

The left child is similar to None class which is used when there can be an error returned.

左子級類似于None類，該類可以在返回錯誤時使用。

The right child is similar to Some class which is used when a vale is to be returned i.e. for the successful execution of code.

正確的子級類似于Some類，該類將在返回谷時即成功執行代碼時使用。

Syntax:

句法：

Either [left, right]

Both left and right are data types of the returned values which can be used to define the results when there are error case or valid case.

左和右均為返回值的數據類型，當出現錯誤情況或有效情況時，可用于定義結果。

理解任一關鍵字工作方式的示例 (Example to understand the working of Either Keyword)

object MyObject {// function defintiondef isEven(number : Int ): Either[String, String] = {if(number%2 == 0){Right(number + " is even.")}elseLeft(number + " is not even.")}// main codedef main(args: Array[String]) {println(isEven(4))println(isEven(95))} }

Output

輸出量

Right(4 is even.) Left(95 is not even.)

翻譯自: https://www.includehelp.com/scala/either-keyword.aspx

scala語言示例

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