odnoletkov / optjson Goto Github PK

let jsonObject = [
  "name": "John",
  "age": 32,
  "phoneNumbers" = [
    [
      "type": "home",
      "number": "646 555-4567"
    ]
  ]
]

// thanks to runtime bridging we can downcast to Foundation types
if let person = nsJSON as? NSDictionary {
  if let phones = person["phoneNumbers"] as? NSArray {
    if let phone = phones[0] as? NSDictionary {
      if let number = phone["number"] as? String {
        assert(number == "646 555-4567")
      }
    }
  }
}

// alternativley – using optional downcasting and optional chaining
let maybeNumber = (((jsonObject as? NSDictionary)?["phoneNumbers"] as? NSArray)?[0] as? NSDictionary)?["number"] as? NSString
assert(maybeNumber == "646 555-4567")

let maybeNumber = JSON(jsonObject)?[key:"phoneNumbers"]?[index:0]?[key:"number"] as? NSString
XCTAssert(maybeNumber == "646 555-4567")