Collection Types

• Array

  Bridge with NSArray

  Type:
  **Array<T> / [T] **, [T] is preferred
  //Empty array
  var arr1: [Int] = Int
  var arr2: [Int] = []

  //Using initializer
  var arr3: [Double] = [Double](count: 3, repeatedValue: 0.0)
  
  //properties & methods
  arr3.count // 3
  arr3.append(2.0) 
  arr3.isEmpty
  arr3[0]
  arr3[0...3] = [1.0, 2.0] //the first fout elements will be replaced
  arr3.insert(3.0, atIndex: 0)
  arr3.removeAtIndex(0)
  arr3.removeLast()
  
  for i in arr3[0..<arr3.count] {
      //TODO
  }
  
  for (index, value) in arr3.enumerate() {
      //TODO
  }
  

• Set

Bridge with NSSet