减少要在Swift中设置的数组 [英] Reduce array to set in Swift
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问题描述
我正在尝试将对象数组简化为Swift中的集合,这是我的代码:
I am trying to reduce an array of objects to a set in Swift and this is my code:
objects.reduce(Set<String>()) { $0.insert($1.URL) }
但是,我得到一个错误:
However, I get an error:
Type of expression is ambiguous without more context.
我不明白问题出在哪里,因为URL的类型肯定是String.有什么想法吗?
I do not understand what the problem is, since the type of URL is definitely String. Any ideas?
推荐答案
您不必精简数组就可以将其放入集合中.只需使用以下数组创建集合:let objectSet = Set(objects.map { $0.URL })
.
You don't have to reduce an array to get it into a set; just create the set with an array: let objectSet = Set(objects.map { $0.URL })
.
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