tuple

Eachtupleis a vector of members.
　　每個元組是一個成員向量。

This statement lets you update atuplewith a specific value.
　　此語句允許您用特定值更新元組。

The if condition after the tuple is a guard.

這個元組後面的if條件是一個守衞。

We're matching on particular kinds of person objects inside the enclosing tuple.

我們在閉合元組裏匹配特定類型的person對象。

Returns a member from a specified tuple.

從指定的元組中返回成員。

In the second case in this example, we've extracted the values inside the tuple to scoped variables,then reused these variables in the resulting expression.

例子裏的第二個case，我們已經解出了元組裏的值並且附給了局部變量，然後在結果表達式中使用了這些變量。

Or you can use a tuple in an expression to explicitly refer to the members specified in the tuple.

或者您也可以在表達式中使用元組顯式引用該元組中指定的成員。 ^[1]