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@ -1,4 +1,4 @@
> 翻译：[honghaoz](https://github.com/honghaoz) > 翻译：[honghaoz](https://github.com/honghaoz), [ray16897188](https://github.com/ray16897188)
> 校对：[numbbbbb](https://github.com/numbbbbb), [stanzhai](https://github.com/stanzhai) > 校对：[numbbbbb](https://github.com/numbbbbb), [stanzhai](https://github.com/stanzhai)
# 模式（Patterns） # 模式（Patterns）
@ -144,8 +144,7 @@ if case let x? = someOptional {
print(x) print(x)
} }
``` ```
如果一个数组的元素是可选类型，可选模式为`for-in`语句提供了在该数组中迭代的简便方式，只为数组中的非空`non-nil`元素执行循环。
可选模式在`for-in`语句提供了在一个元素是可选类型的数组中迭代的简便方式，只为数组中的非空`non-nil`元素执行循环。
```swift ```swift
let arrayOfOptionalInts: [Int?] = [nil, 2, 3, nil, 5] let arrayOfOptionalInts: [Int?] = [nil, 2, 3, nil, 5]