//: Playground - noun: a place where people can play
import UIKit
// for 循环
//你可以使用for-in循环来遍历一个集合里面的所有元素，例如由数字表示的区间、数组中的元素、字符串中的字符。
for index in 1...5{
println(index);
}
//如果你不需要知道区间内每一项的值，你可以使用下划线（_）替代变量名来忽略对值的访问
var count = 3;
var one = 1;
var two = 2;
for _ in 1...count{
one *= two
}
// 遍历数组
var arr1 = ["E","n","d","a"];
for name in arr1{
println(name);
}
// key + value
var arr2 = [1:"E",2:"n",3:"d",4:"a"];
for (key,value) in arr2{
println("\(key)==>\(value)")
}
// 遍历字符串
var names = "MyNameisEnda";
for name in names{
println("\(name)");
}
// for 条件递增
for var index = 0;index<3;++index{
println(index);
}