nhathm

struct Car {
    var id: Int
    init?(id: Int) {
        guard id > 0 else {
             return nil
             }
        self.id = id
    }
    
    func checkSystemWhenStart() throws -> String {

nhathm

import Foundation

@dynamicCallable
class DynamicCalculator {
    func dynamicallyCall(withArguments args: [Int]) -> Int {
        return args.reduce(0, +)
    }
    
    func dynamicallyCall(withKeywordArguments args: KeyValuePairs<String, Int>) -> Int {
        let sum = args.reduce(0) {

nhathm

import Foundation

// Dynamic Member Lookup
@dynamicMemberLookup
struct Computer {
    var values: [String: String]
    subscript(dynamicMember member: String) -> String {
        return values[member, default: "Value for \(member) not exist"]
    }
}

nhathm

enum ServerError: Error {
    case urlFailed
    case networkFailed
    case serverFailed
    case dataFailed
}

func fetchDataFromServer(_ urlString: String, completion: @escaping (Result<Data, ServerError>) -> ()) {
    // Check if URL valid

nhathm

func fetchDataFromServer(_ urlString: String, completion: @escaping (Data?, String?) -> ()) {
    // Check if URL valid
    guard let url = URL(string: urlString) else {
        completion(nil, "Invalid URL")
        return
    }

    let defaultSession = URLSession(configuration: URLSessionConfiguration.default)
    let dataTask : URLSessionTask = defaultSession.dataTask(with: url) { data, response, error in
        guard error == nil else {

nhathm

let someStrangeString = ###"This is a sample of ##" and "## strings "###
// output: This is a sample of ##" and "## strings

nhathm

let rawStringWithHashSymbol = ##"Sample raw string with # symbol"##
// output: Sample raw string with # symbol

nhathm

let age = 18
let ageDescription = #"My age = \#(age)"# // Swift 4.2: \(age) => Swift 5: \#(age)
// output: My age = 18

nhathm

let rawStringInSwift5 = #"This is a sample about backslash \ and quote mark " in Swift 5"#
// output: This is a sample about backslash \ and quote mark " in Swift 5

nhathm

let backslashString = "Hello, backslash \\"
// output: Hello, backslash \
let quotemarkString = "Hello, quote mark \""
// output: Hello, quote mark "