How to use spec method of is class

Best Quick code snippet using is.spec

main.swift

Source:main.swift Github

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...9 *10 * Unless required by applicable law or agreed to in writing, software11 * distributed under the License is distributed on an "AS IS" BASIS,12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.13 * See the License for the specific language governing permissions and14 * limitations under the License.15 */16import ArgumentParser17import Foundation18private enum Constants {}19extension Constants {20 static let specDependencyLabel = "dependency"21 static let skipLinesWithWords = ["unit_tests", "test_spec"]22 static let dependencyLineSeparators = CharacterSet(charactersIn: " ,/")23 static let podSources = [24 "https://${BOT_TOKEN}@github.com/FirebasePrivate/SpecsTesting",25 "https://github.com/firebase/SpecsStaging.git",26 "https://cdn.cocoapods.org/",27 ]28 static let exclusivePods: [String] = ["FirebaseSegmentation"]29}30// flags for 'pod push'31extension Constants {32 static let flags = ["--skip-tests", "--allow-warnings"]33 static let umbrellaPodFlags = Constants.flags + ["--skip-import-validation", "--use-json"]34}35// SpecFiles is a wraper of dict mapping from required pods to their path. This36// will also contain a sequence of installing podspecs.37class SpecFiles {38 private var specFilesDict: [String: URL]39 var depInstallOrder: [String]40 var specSource: String41 init(_ specDict: [String: URL], from specSourcePath: String) {42 specFilesDict = specDict43 depInstallOrder = []44 specSource = specSourcePath45 }46 func removePod(_ key: String) {47 specFilesDict.removeValue(forKey: key)48 }49 subscript(key: String) -> URL? {50 return specFilesDict[key]51 }52 func contains(_ key: String) -> Bool {53 return specFilesDict[key] != nil54 }55 func isEmpty() -> Bool {56 return specFilesDict.isEmpty57 }58}59struct Shell {60 static let shared = Shell()61 @discardableResult62 func run(_ command: String, displayCommand: Bool = true,63 displayFailureResult: Bool = true) -> Int32 {64 let task = Process()65 let pipe = Pipe()66 task.standardOutput = pipe67 task.launchPath = "/bin/bash"68 task.arguments = ["-c", command]69 task.launch()70 if displayCommand {71 print("[SpecRepoBuilder] Command:\(command)\n")72 }73 task.waitUntilExit()74 let data = pipe.fileHandleForReading.readDataToEndOfFile()75 let log = String(data: data, encoding: .utf8)!76 if displayFailureResult, task.terminationStatus != 0 {77 print("-----Exit code: \(task.terminationStatus)")78 print("-----Log:\n \(log)")79 }80 return task.terminationStatus81 }82}83// Error types84enum SpecRepoBuilderError: Error {85 // Error occurs when circular dependencies are detected and deps will be86 // displayed.87 case circularDependencies(pods: Set<String>)88 // Error occurs when there exist specs that failed to push to a spec repo. All89 // specs failed to push should be displayed.90 case failedToPush(pods: [String])91 // Error occurs when a podspec is not found in the repo.92 case podspecNotFound(_ podspec: String, from: String)93}94struct SpecRepoBuilder: ParsableCommand {95 @Option(help: "The root of the firebase-ios-sdk checked out git repo.")96 var sdkRepo: String = FileManager().currentDirectoryPath97 @Option(help: "A list of podspec sources in Podfiles.")98 var podSources: [String] = Constants.podSources99 @Option(help: "Podspecs that will not be pushed to repo.")100 var excludePods: [String] = Constants.exclusivePods101 @Option(help: "Github Account Name.")102 var githubAccount: String = "FirebasePrivate"103 @Option(help: "Github Repo Name.")104 var sdkRepoName: String = "SpecsTesting"105 @Option(help: "Local Podspec Repo Name.")106 var localSpecRepoName: String107 @Flag(help: "Raise error while circular dependency detected.")108 var raiseCircularDepError: Bool = false109 // This will track down dependencies of pods and keep the sequence of110 // dependency installation in specFiles.depInstallOrder.111 func generateOrderOfInstallation(pods: [String], specFiles: SpecFiles,112 parentDeps: inout Set<String>) {113 // pods are dependencies will be tracked down.114 // specFiles includes required pods and their URLs.115 // parentDeps will record the path of tracking down dependencies to avoid116 // duplications and circular dependencies.117 // Stop tracking down when the parent pod does not have any required deps.118 if pods.isEmpty {119 return120 }121 for pod in pods {122 guard specFiles.contains(pod) else { continue }123 let deps = getTargetedDeps(of: pod, from: specFiles)124 // parentDeps will have all dependencies the current pod supports. If the125 // current pod were in the parent dependencies, that means it was tracked126 // before and it is circular dependency.127 if parentDeps.contains(pod) {128 print("Circular dependency is detected in \(pod) and \(parentDeps)")129 if raiseCircularDepError {130 Self131 .exit(withError: SpecRepoBuilderError132 .circularDependencies(pods: parentDeps))133 }134 continue135 }136 // Record the pod as a parent and use depth-first-search to track down137 // dependencies of this pod.138 parentDeps.insert(pod)139 generateOrderOfInstallation(140 pods: deps,141 specFiles: specFiles,142 parentDeps: &parentDeps143 )144 // When pod does not have required dep or its required deps are recorded,145 // the pod itself will be recorded into the depInstallOrder.146 if !specFiles.depInstallOrder.contains(pod) {147 print("\(pod) depends on \(deps).")148 specFiles.depInstallOrder.append(pod)149 }150 // When track back from a lower level, parentDep should track back by151 // removing one pod.152 parentDeps.remove(pod)153 }154 }155 // Scan a podspec file and find and return all dependencies in this podspec.156 func searchDeps(ofPod podName: String, from podSpecFiles: SpecFiles) -> [String] {157 var deps: [String] = []158 var fileContents = ""159 guard let podSpecURL = podSpecFiles[podName] else {160 Self161 .exit(withError: SpecRepoBuilderError162 .podspecNotFound(podName, from: podSpecFiles.specSource))163 }164 do {165 fileContents = try String(contentsOfFile: podSpecURL.path, encoding: .utf8)166 } catch {167 fatalError("Could not read \(podName) podspec from \(podSpecURL.path).")168 }169 // Get all the lines containing `dependency` but don't contain words we170 // want to ignore.171 let depLines: [String] = fileContents172 .components(separatedBy: .newlines)173 .filter { $0.contains("dependency") }174 // Skip lines with words in Constants.skipLinesWithWords175 .filter { !Constants.skipLinesWithWords.contains(where: $0.contains)176 }177 for line in depLines {178 let newLine = line.trimmingCharacters(in: .whitespacesAndNewlines)179 // This is to avoid pushing umbrellapods like Firebase/Core.180 let tokens = newLine.components(separatedBy: Constants.dependencyLineSeparators)181 if let depPrefix = tokens.first {182 if depPrefix.hasSuffix(Constants.specDependencyLabel) {183 // e.g. In Firebase.podspec, Firebase/Core will not be considered a184 // dependency.185 // "ss.dependency 'Firebase/Core'" will be splited in186 // ["ss.dependency", "'Firebase", "Core'"]187 let podNameRaw = String(tokens[1]).replacingOccurrences(of: "'", with: "")188 // In the example above, deps here will not include Firebase since189 // it is the same as the pod name.190 if podNameRaw != podName { deps.append(podNameRaw) }191 }192 }193 }194 return deps195 }196 // Filter and get a list of required dependencies found in the repo.197 func filterTargetDeps(_ deps: [String], with targets: SpecFiles) -> [String] {198 var targetedDeps: [String] = []199 for dep in deps {200 // Only get unique and required dep in the output list.201 if targets.contains(dep), !targetedDeps.contains(dep) {202 targetedDeps.append(dep)203 }204 }205 return targetedDeps206 }207 func getTargetedDeps(of pod: String, from specFiles: SpecFiles) -> [String] {208 let deps = searchDeps(ofPod: pod, from: specFiles)209 return filterTargetDeps(deps, with: specFiles)210 }211 func pushPodspec(forPod pod: String, sdkRepo: String, sources: [String],212 flags: [String], shell: Shell = Shell.shared) -> Int32 {213 let podPath = sdkRepo + "/" + pod + ".podspec"214 let sourcesArg = sources.joined(separator: ",")215 let flagsArg = flags.joined(separator: " ")216 let outcome =217 shell218 .run(219 "pod repo push \(localSpecRepoName) \(podPath) --sources=\(sourcesArg) \(flagsArg)"220 )221 shell.run("pod repo update")222 return outcome223 }224 // This will commit and push to erase the entire remote spec repo.225 func eraseRemoteRepo(repoPath: String, from githubAccount: String, _ sdkRepoName: String,226 shell: Shell = Shell.shared) {227 shell228 .run(229 "git clone --quiet https://${BOT_TOKEN}@github.com/\(githubAccount)/\(sdkRepoName).git"230 )231 let fileManager = FileManager.default232 do {233 let dirs = try fileManager.contentsOfDirectory(atPath: "\(repoPath)/\(sdkRepoName)")234 for dir in dirs {235 if dir != ".git" {236 shell.run("cd \(sdkRepoName); git rm -r \(dir)")237 }238 }239 shell.run("cd \(sdkRepoName); git commit -m 'Empty repo'; git push")240 } catch {241 print("Error while enumerating files \(repoPath): \(error.localizedDescription)")242 }243 do {244 try fileManager.removeItem(at: URL(fileURLWithPath: "\(repoPath)/\(sdkRepoName)"))245 } catch {246 print("Error occurred while removing \(repoPath)/\(sdkRepoName): \(error)")247 }248 }249 mutating func run() throws {250 let fileManager = FileManager.default251 let curDir = FileManager().currentDirectoryPath252 var podSpecFiles: [String: URL] = [:]253 let documentsURL = URL(fileURLWithPath: sdkRepo)254 do {255 let fileURLs = try fileManager.contentsOfDirectory(256 at: documentsURL,257 includingPropertiesForKeys: nil258 )259 let podspecURLs = fileURLs.filter { $0.pathExtension == "podspec" }260 for podspecURL in podspecURLs {261 let podName = podspecURL.deletingPathExtension().lastPathComponent262 if !Constants.exclusivePods.contains(podName) {263 podSpecFiles[podName] = podspecURL264 }265 }266 } catch {267 print(268 "Error while enumerating files \(documentsURL.path): \(error.localizedDescription)"269 )270 }271 // This set is used to keep parent dependencies and help detect circular272 // dependencies.273 var tmpSet: Set<String> = []274 print("Detect podspecs: \(podSpecFiles.keys)")275 let specFileDict = SpecFiles(podSpecFiles, from: sdkRepo)276 generateOrderOfInstallation(277 pods: Array(podSpecFiles.keys),278 specFiles: specFileDict,279 parentDeps: &tmpSet280 )281 print("Podspec push order:\n", specFileDict.depInstallOrder.joined(separator: "->\t"))282 do {283 if fileManager.fileExists(atPath: "\(curDir)/\(sdkRepoName)") {284 print("remove \(sdkRepoName) dir.")285 try fileManager.removeItem(at: URL(fileURLWithPath: "\(curDir)/\(sdkRepoName)"))286 }287 eraseRemoteRepo(repoPath: "\(curDir)", from: githubAccount, sdkRepoName)288 } catch {289 print("error occurred. \(error)")290 }291 var exitCode: Int32 = 0292 var failedPods: [String] = []293 for pod in specFileDict.depInstallOrder {294 var podExitCode: Int32 = 0295 print("----------\(pod)-----------")296 switch pod {297 case "Firebase":298 podExitCode = pushPodspec(299 forPod: pod,300 sdkRepo: sdkRepo,301 sources: podSources,302 flags: Constants.umbrellaPodFlags303 )304 default:305 podExitCode = pushPodspec(306 forPod: pod,307 sdkRepo: sdkRepo,308 sources: podSources,309 flags: Constants.flags310 )311 }312 if podExitCode != 0 {313 exitCode = 1314 failedPods.append(pod)315 }316 }317 if exitCode != 0 {318 Self.exit(withError: SpecRepoBuilderError.failedToPush(pods: failedPods))319 }...

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World.swift

Source:World.swift Github

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...42 internal var isRunningAdditionalSuites = false43#else44 internal var isRunningAdditionalSuites = false45#endif46 private var specs: [String: ExampleGroup] = [:]47 private var sharedExamples: [String: SharedExampleClosure] = [:]48 private let configuration = Configuration()49 internal private(set) var isConfigurationFinalized = false50 internal var exampleHooks: ExampleHooks {return configuration.exampleHooks }51 internal var suiteHooks: SuiteHooks { return configuration.suiteHooks }52 // MARK: Singleton Constructor53 private override init() {}54 static let sharedWorld = World()55 // MARK: Public Interface56 /**57 Exposes the World's Configuration object within the scope of the closure58 so that it may be configured. This method must not be called outside of59 an overridden +[QuickConfiguration configure:] method.60 - parameter closure: A closure that takes a Configuration object that can61 be mutated to change Quick's behavior.62 */63 internal func configure(_ closure: QuickConfigurer) {64 assert(!isConfigurationFinalized,65 "Quick cannot be configured outside of a +[QuickConfiguration configure:] method. You should not call -[World configure:] directly. Instead, subclass QuickConfiguration and override the +[QuickConfiguration configure:] method.")66 closure(configuration)67 }68 /**69 Finalizes the World's configuration.70 Any subsequent calls to World.configure() will raise.71 */72 internal func finalizeConfiguration() {73 isConfigurationFinalized = true74 }75 /**76 Returns an internally constructed root example group for the given77 QuickSpec class.78 A root example group with the description "root example group" is lazily79 initialized for each QuickSpec class. This root example group wraps the80 top level of a -[QuickSpec spec] method--it's thanks to this group that81 users can define beforeEach and it closures at the top level, like so:82 override func spec() {83 // These belong to the root example group84 beforeEach {}85 it("is at the top level") {}86 }87 - parameter cls: The QuickSpec class for which to retrieve the root example group.88 - returns: The root example group for the class.89 */90 internal func rootExampleGroupForSpecClass(_ cls: AnyClass) -> ExampleGroup {91 let name = String(describing: cls)92 if let group = specs[name] {93 return group94 } else {95 let group = ExampleGroup(96 description: "root example group",97 flags: [:],98 isInternalRootExampleGroup: true99 )100 specs[name] = group101 return group102 }103 }104 /**105 Returns all examples that should be run for a given spec class.106 There are two filtering passes that occur when determining which examples should be run.107 That is, these examples are the ones that are included by inclusion filters, and are108 not excluded by exclusion filters.109 - parameter specClass: The QuickSpec subclass for which examples are to be returned.110 - returns: A list of examples to be run as test invocations.111 */112 internal func examples(_ specClass: AnyClass) -> [Example] {113 // 1. Grab all included examples.114 let included = includedExamples115 // 2. Grab the intersection of (a) examples for this spec, and (b) included examples.116 let spec = rootExampleGroupForSpecClass(specClass).examples.filter { included.contains($0) }117 // 3. Remove all excluded examples.118 return spec.filter { example in119 !self.configuration.exclusionFilters.reduce(false) { $0 || $1(example) }120 }121 }122#if _runtime(_ObjC)123 @objc(examplesForSpecClass:)124 private func objc_examples(_ specClass: AnyClass) -> [Example] {125 return examples(specClass)126 }127#endif128 // MARK: Internal129 internal func registerSharedExample(_ name: String, closure: @escaping SharedExampleClosure) {130 raiseIfSharedExampleAlreadyRegistered(name)131 sharedExamples[name] = closure132 }133 internal func sharedExample(_ name: String) -> SharedExampleClosure {134 raiseIfSharedExampleNotRegistered(name)135 return sharedExamples[name]!136 }137 internal var includedExampleCount: Int {138 return includedExamples.count139 }140 internal var beforesCurrentlyExecuting: Bool {141 let suiteBeforesExecuting = suiteHooks.phase == .beforesExecuting142 let exampleBeforesExecuting = exampleHooks.phase == .beforesExecuting143 var groupBeforesExecuting = false144 if let runningExampleGroup = currentExampleMetadata?.example.group {145 groupBeforesExecuting = runningExampleGroup.phase == .beforesExecuting146 }147 return suiteBeforesExecuting || exampleBeforesExecuting || groupBeforesExecuting148 }149 internal var aftersCurrentlyExecuting: Bool {150 let suiteAftersExecuting = suiteHooks.phase == .aftersExecuting151 let exampleAftersExecuting = exampleHooks.phase == .aftersExecuting152 var groupAftersExecuting = false153 if let runningExampleGroup = currentExampleMetadata?.example.group {154 groupAftersExecuting = runningExampleGroup.phase == .aftersExecuting155 }156 return suiteAftersExecuting || exampleAftersExecuting || groupAftersExecuting157 }158 internal func performWithCurrentExampleGroup(_ group: ExampleGroup, closure: () -> Void) {159 let previousExampleGroup = currentExampleGroup160 currentExampleGroup = group161 closure()162 currentExampleGroup = previousExampleGroup163 }164 private var allExamples: [Example] {165 var all: [Example] = []166 for (_, group) in specs {167 group.walkDownExamples { all.append($0) }168 }169 return all170 }171 private var includedExamples: [Example] {172 let all = allExamples173 let included = all.filter { example in174 return self.configuration.inclusionFilters.reduce(false) { $0 || $1(example) }175 }176 if included.isEmpty && configuration.runAllWhenEverythingFiltered {177 return all178 } else {179 return included180 }...

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Contents.swift

Source:Contents.swift Github

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...43 func isSatisfied(_ item: Product) -> Bool44}45protocol Filter {46 associatedtype T47 func filter<Spec: Specification>(_ items:[T], _ spec: Spec) -> [T] where Spec.T == T48}49class BetterFilter: Filter {50 typealias T = Product51 func filter<Spec: Specification>(_ items: [Product], _ spec: Spec) -> [Product] {52 var result = [Product]()53 for item in items {54 if spec.isSatisfied(item) {55 result.append(item)56 }57 }58 return result59 }60}61class ColorSpecification: Specification {62 typealias T = Product63 64 let color: Color65 66 init(_ color: Color) {67 self.color = color68 }69 70 func isSatisfied(_ item: Product) -> Bool {71 return item.color == color72 }73}74class SizeSpecification: Specification {75 typealias T = Product76 77 let size: Size78 79 init(_ size: Size) {80 self.size = size81 }82 83 func isSatisfied(_ item: Product) -> Bool {84 return item.size == size85 }86}87class AndSpecification<SpecA: Specification, SpecB: Specification, T>: Specification where SpecA.T == SpecB.T, SpecA.T == T88{89 typealias T = Product90 91 let specA: SpecA92 let specB: SpecB93 94 init(_ specA: SpecA, _ specB: SpecB) {95 self.specA = specA96 self.specB = specB97 }98 99 func isSatisfied(_ item: Product) -> Bool {100 return specA.isSatisfied(item) && specB.isSatisfied(item)101 }102}103print("============Better Filter ==============")104let betterFilter = BetterFilter()105for product in betterFilter.filter(products, ColorSpecification(.green)) {106 print(" - \(product.name) is \(product.color) and \(product.size)")107}108for product in betterFilter.filter(products, SizeSpecification(.large)) {109 print(" - \(product.name) is \(product.color) and \(product.size)")110}111print("========================================")112for product in betterFilter.filter(products,113 AndSpecification(ColorSpecification(.blue),114 SizeSpecification(.large))) {...

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spec

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1class A{2 init(a: Int){3 }4}5class B: A{6 init(a: Int, b: Int){7 super.init(a: a)8 }9}10class C: B{11 init(a: Int, b: Int, c: Int){12 super.init(a: a, b: b)13 }14}15let c = C(a: 1, b: 2, c: 3)16let b = B(a: 1, b: 2)17let a = A(a: 1)18if let _ = c as? B{19 print("c is B")20}21if let _ = c as? A{22 print("c is A")23}24if let _ = b as? A{25 print("b is A")26}27if let _ = a as? A{28 print("a is A")29}30class A{31 init(a: Int){32 }33}34class B: A{35 init(a: Int, b: Int){36 super.init(a: a)37 }38}39class C: B{40 init(a: Int, b: Int, c: Int){41 super.init(a: a, b: b)42 }43}44let c = C(a: 1, b: 2, c: 3)45let b = B(a: 1, b: 2)46let a = A(a: 1)47if c is B{48 print("c is B")49}50if c is A{51 print("c is A")52}53if b is A{54 print("b is A")55}56if a is A{57 print("a is A")58}59protocol P{60 var p: Int {get}61}62class A: P{63 init(p: Int){64 }65}66class B: A{67 init(p

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1import Foundation2class Person {3 init(name: String) {4 }5}6extension Person {7 static func isPerson(obj: AnyObject) -> Bool {8 }9}10let p = Person(name: "John")11Person.isPerson(obj: obj)12import Foundation13class Person {14 init(name: String) {15 }16}17extension Person {18 static func isPerson(obj: AnyObject) -> Bool {19 }20}21let p = Person(name: "John")22Person.isPerson(obj: obj)23import Foundation24class Person {25 init(name: String) {26 }27}28extension Person {29 static func isPerson(obj: AnyObject) -> Bool {30 }31}32let p = Person(name: "John")33Person.isPerson(obj: obj)34import Foundation35class Person {36 init(name: String) {37 }38}39extension Person {40 static func isPerson(obj: AnyObject) -> Bool {41 }42}43let p = Person(name: "John")44Person.isPerson(obj: obj)45import Foundation46class Person {47 init(name: String) {48 }49}50extension Person {51 static func isPerson(obj: AnyObject) -> Bool {52 }53}54let p = Person(name: "John")55Person.isPerson(obj: obj)56import Foundation57class Person {58 init(name: String) {59 }60}61extension Person {62 static func isPerson(obj:

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spec

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1class Person {2 init(name: String) {3 }4 func spec() {5 print("I am a person")6 }7}8class Student: Person {9 init(name: String, id: Int) {10 super.init(name: name)11 }12 override func spec() {13 print("I am a student")14 }15}16var p = Person(name: "Sachin")17p.spec()18var s = Student(name: "Rahul", id: 1)19s.spec()20class Person {21 init(name: String) {22 }23 func spec() {24 print("I am a person")25 }26}27class Student: Person {28 init(name: String, id: Int) {29 super.init(name: name)30 }31 override func spec() {32 print("I am a student")33 }34}35var p: Person = Person(name: "Sachin")36p.spec()37var s: Person = Student(name: "Rahul", id: 1)38s.spec()39class Person {40 init(name: String) {41 }42 func spec() {43 print("I am a person")44 }45}46class Student: Person {47 init(name: String, id: Int) {48 super.init(name: name)49 }50 override func spec() {51 print("I am a student")52 }53}54var p: Person = Person(name: "Sachin")55p.spec()56var s: Student = Student(name: "Rahul", id: 1)57s.spec()58class Person {59 init(name: String) {60 }61 func spec() {62 print("I am a person")63 }64}65class Student: Person {66 init(name: String, id

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1import UIKit2class ViewController: UIViewController {3 override func viewDidLoad() {4 super.viewDidLoad()5 let p = Person()6 p.eat()7 }8}9class Person {10 func eat(){11 print("eating")12 }13}14import UIKit15class ViewController: UIViewController {16 override func viewDidLoad() {17 super.viewDidLoad()18 let p = Person()19 p.eat()20 }21}22class Person {23 func eat(){24 print("eating")25 }26}27import UIKit28class ViewController: UIViewController {29 override func viewDidLoad() {30 super.viewDidLoad()31 let p = Person()32 p.eat()33 }34}35class Person {36 func eat(){37 print("eating")38 }39}40import UIKit41class ViewController: UIViewController {42 override func viewDidLoad() {43 super.viewDidLoad()44 let p = Person()45 p.eat()46 }47}48class Person {49 func eat(){50 print("eating")51 }52}53import UIKit54class ViewController: UIViewController {55 override func viewDidLoad() {56 super.viewDidLoad()57 let p = Person()58 p.eat()59 }60}61class Person {62 func eat(){63 print("eating")64 }65}66import UIKit67class ViewController: UIViewController {68 override func viewDidLoad() {69 super.viewDidLoad()70 let p = Person()71 p.eat()72 }73}74class Person {75 func eat(){76 print("eating")77 }78}79import UIKit80class ViewController: UIViewController {81 override func viewDidLoad() {82 super.viewDidLoad()83 let p = Person()84 p.eat()85 }86}87class Person {

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1class Person {2 init(name: String) {3 }4}5let person = Person(name: "John")6if person is Person {7 print("This is a person")8}9class Person {10 init(name: String) {11 }12}13let person = Person(name: "John")14if person is Person {15 print("This is a person")16}17class Person {18 init(name: String) {19 }20}21let person = Person(name: "John")22if person is Person {23 print("This is a person")24}25class Person {26 init(name: String) {27 }28}29let person = Person(name: "John")30if person is Person {31 print("This is a person")32}33class Person {34 init(name: String) {35 }36}37let person = Person(name: "John")38if person is Person {39 print("This is a person")40}41class Person {42 init(name: String) {43 }44}45let person = Person(name: "John")46if person is Person {47 print("This is a person")48}49class Person {50 init(name: String) {51 }52}53let person = Person(name: "John")54if person is Person {55 print("This is a person")56}57class Person {58 init(name: String) {59 }60}

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1import Foundation2import UIKit3class ViewController: UIViewController {4 override func viewDidLoad() {5 super.viewDidLoad()6 let person = Person()

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1import Foundation2class A {3}4class B: A {5}6func isClass<T>(_ a: T) -> Bool {7 return (a as AnyObject) is A8}9let a = A()10let b = B()11import Foundation12class A {13}14class B: A {15}16func isClass<T>(_ a: T) -> Bool {17 return (a as AnyObject) is B18}19let a = A()20let b = B()21import Foundation22class A {23}24class B: A {25}26func isClass<T>(_ a: T) -> Bool {27 return (a as? A) != nil28}29let a = A()30let b = B()31import Foundation32class A {33}34class B: A {35}36func isClass<T>(_ a: T) -> Bool {37 return (a as? B) != nil38}39let a = A()40let b = B()41import Foundation42class A {43}44class B: A {45}46func isClass<T>(_ a: T) -> Bool {47 return (a as? B) == nil48}49let a = A()50let b = B()51import Foundation52class A {

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