[英]swift remove item from array after `filter` or by finding `firstIndex that `contains`
我有两个Book
数组
var tempArray = [Book]()
var filteredArray = [Book]()
哪里
struct Book: Codable, Equatable {
let category: String
let title: String
let author: String
}
如果title
匹配,我想从tempArray
删除一本书。 我可以过滤tempArray
搜索"Some title"
filteredArray = tempArray.filter( { $0.title.range(of: "Some Title", options: .caseInsensitive) != nil } )
我正在尝试删除
if let i = tempArray.firstIndex(of: { $0.title.contains("Some Title") }) {
tempArray.remove(at: i)
}
但是得到这个Cannot invoke 'contains' with an argument list of type '(String)'
。 建议解决此错误? 或者,可以在过滤时删除元素吗?
您使用了错误的方法。 它应该是func firstIndex(where predicate: (Self.Element) throws -> Bool) rethrows -> Self.Index?
而不是func firstIndex(of element: Book) -> Int?
if let i = tempArray.firstIndex(where: { $0.title.contains("Some Title") }) {
tempArray.remove(at: i)
}
另一个选择是使用RangeReplaceableCollection
的方法来mutating func removeAll(where shouldBeRemoved: (Book) throws -> Bool) rethrows
RangeReplaceableCollection
的方法:
tempArray.removeAll { $0.title.contains("Some Title") }
游乐场测试:
struct Book: Codable, Equatable {
let category, title, author: String
}
var tempArray: [Book] = [.init(category: "", title: "Some Title", author: "")]
print(tempArray) // "[__lldb_expr_12.Book(category: "", title: "Some Title", author: "")]\n"
tempArray.removeAll { $0.title.contains("Some Title") }
print(tempArray) // "[]\n"
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.