Swift 4.0 JSON Usage

main.swift

import Foundation

public struct Person: Codable, Equatable {
  public var name = ""
  public var age = 0
  public static func == (lhs: Person, rhs: Person) -> Bool {
    return lhs.name == rhs.name && lhs.age == rhs.age
  }
}

public extension Data {
  public func stringValue() -> String {
    return self.withUnsafeBytes { (p: UnsafePointer<CChar>) -> String in
      return String(cString: p)
    }
  }
}

let rocky = Person(name: "rocky", age: 24)
do {
  let json = JSONEncoder()
  let data = try json.encode(rocky)
  let str = data.stringValue()
  print(str)
  let dec = JSONDecoder()
  let person = try dec.decode(Person.self, from: data)
  print(person)
  print( person == rocky)
} catch {
  print(error.localizedDescription)
}