Swift 集合

数组

93> let color = ["red","orange","yellow","green"]
color: [String] = 4 values {
 [0] = "red"
 [1] = "orange"
 [2] = "yellow"
 [3] = "green"
}
94> color[0]
$R36: String = "red"
95> color[1]
$R37: String = "orange"
96> color[2]
$R38: String = "yellow"
97> color[3]
$R39: String = "green"

字典

126> var dict = ["name":"hello", "age":"10", "sex":"Female"]
dict: [String : String] = 3 key/value pairs {
 [0] = {
   key = "name"
   value = "hello"
 }
 [1] = {
   key = "age"
   value = "10"
 }
 [2] = {
   key = "sex"
   value = "Female"
 }
}

数组的数组

var array [String : [String]]

创建空数组

142> var empty_array : Array<Int> = []
empty_array: [Int] = 0 values
143> var empty_array = [Int]()
empty_array: [Int] = 0 values

创建空字典

151> var empty_dictionary = Dictionary<String,Double>()
empty_dictionary: [String : Double] = 0 key/value pairs