iPerfman is an iPerf3 tool that supports all apple platforms: iOS, iPadOS, macOS, and tvOS.
The iperf series of tools perform active measurements to determine the maximum achievable bandwidth on IP networks.
Beautiful speedometer and speed chart.
You can test the LAN network speed to find the best WIFI router location.
You can test more complex networks by manually setting test parameters, for example to test the performance of UDP mode, and use the bandwidth-limiting functionality to simulate a bandwidth-constrained network environment.
iPerfman supports both Chinese and English, and you can choose your preferred language in the settings for ease of use.
Overall, iPerfman is a powerful network speed measurement tool that helps you evaluate network performance and provides you with a better network experience.
我们的服务可能包含来自我们服务提供商的第三方跟踪以及数据收集和分析工具，例如 Google Analytics（分析）和 Google Firebase 。此类第三方可以在我们的服务中使用 Cookie，API 和 SDK，以使他们能够代表我们收集和分析与用户和设备相关的数据和信息。第三方可能会访问并收集有关您的数据和信息，例如您的设备标识符(包括IMEI、MEID、IMSI、GUID、MAC地址及其他相关信息)，语言环境（使用特定语言的特定位置），地理位置信息，IP 地址，应用程序使用情况，访问权限和会话时间，传感器数据，设备上存在的或在设备上特定时间使用的应用程序以及您对广告的观看和互动，以提供其服务，包括例如启用，提供和投放广告在下面有更详细的说明。
Using a negative number or an index equal to or greater than count triggers a runtime error.
使用负数或大于等于count的索引会触发运行时错误。
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print(emptyDoubles[0])
ClosedRange.swift
An equivalent range must be representable as a closed range. For example, passing an empty range as other triggers a runtime error, because an empty range cannot be represented by a closed range instance.
等效范围必须可以表示为闭合范围。例如，将空范围作为 other 传递会触发运行时错误，因为空范围不能由封闭范围实例表示。
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let emptyRange =0..<0 ClosedRange(emptyRange)
Dictionary.swift
Passing a sequence with duplicate keys to this initializer results in a runtime error. If your sequence might have duplicate keys, use the Dictionary(_:uniquingKeysWith:) initializer instead.
When the additive inverse of a value is unrepresentable in a conforming type, the operation should either trap or return an exceptional value. For example, using the negation operator (prefix -) with Int.min results in a runtime error.
In debug builds (-Onone), the unsafelyUnwrapped property has the same behavior as using the postfix ! operator and triggers a runtime error if the instance is nil.
let optionalInt: Int? =nil optionalInt.unsafelyUnwrapped optionalInt!
Policy.swift
If you have prior knowledge that an AnyObject instance has a particular type, you can use the unconditional downcast operator (as!). Performing an invalid cast triggers a runtime error.
let message = s as!String print("Successful cast to String: \(message)") // Prints "Successful cast to String: This is a bridged string." let badCase = v as!String // Runtime error
Range.swift
An equivalent range must be representable as an instance of Range. For example, passing a closed range with an upper bound of Int.max triggers a runtime error, because the resulting half-open range would require an upper bound of Int.max + 1, which is not representable as
范围边界值越界会触发运行时错误，如设置最大值为Int.max时。
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Range(0...Int.max)
Always use the slice’s startIndex property instead of assuming that its indices start at a particular value. Attempting to access an element by using an index outside the bounds of the slice’s indices may result in a runtime error, even if that index is valid for the original collection.
// * a single Unicode scalar value, under very limited circumstances: structMyStaticScalar: ExpressibleByUnicodeScalarLiteral { typealiasUnicodeScalarLiteralType=StaticString let value: StaticString init(unicodeScalarLiteralvalue: StaticString) { self.value = value } }
extensionTreeNodewhereT: Equatable { publicfuncsearch(_value: T) -> TreeNode? { var result: TreeNode? forEachDepthFirst { node in if node.value == value { result = node } } return result } }
Options: -V, --version output the version number -h, --help output usage information
Commands: build build the project in a local container create interactively create a Kitura project idt install IBM Cloud Developer Tools init scaffold a bare-bones Kitura project kit print Cocoapods boilerplate for KituraKit run run the project in a local container sdk generate a client SDK from an OpenAPI/Swagger spec help [cmd] display help for [cmd]
publicstructSong: Codable { var title: String var length: Int enumCodingKeys: String, CodingKey { case title ="songTitle" case length ="songLength" } }
publicstructAnimal: Codable { var name: String var age: Int? var isFriendly: Bool var birthday: Date var songs: [Song] }
// 2 嵌套 let baloo =Animal(name: "Baloo", age: 5, isFriendly: true, birthday: Date(), songs: [Song(title: "The Bare Necessities", length: 180)]) let bagheera =Animal(name: "Bagheera", age: nil, isFriendly: true, birthday: Date(), songs: [Song(title: "Jungle's No Place For A Boy", length: 95)])
