Swift - 20 - 字典的基础操作

//: Playground - noun: a place where people can play
 
import UIKit
 
var dict = [1:"one", 2:"two", 3:"three", 4:"four"]
 
dict.count
dict.isEmpty
 
dict[1]
dict[66]
 
"课程名称: " + dict[1]!
 
// 添加和修改
dict[5] = "five"
dict[4] = "44444"
dict.updateValue("2222", forKey: 2);
dict
 
// 删除
dict[1] = nil;
dict.removeValueForKey(5)
dict
 
// 遍历
for (key, value) in dict {
    print("key:\(key) value:\(value)")
}
 
dict.keys
dict.values
 
for key in dict.keys {
    print(key)
}
 
for value in dict.values {
    print(value)
}