/**
5.4-函数的默认参数
*/
let str1 = joinString(s1: "hell",toString: "world")
print(str1)
let str2 = joinString(s1: "hell",toString: "world",joiner: "¥")
print(str2)
let str3 = joinString2(s1: "hellw",joiner: "#")
print(str3)
let str4 = joinString2(s1: "llll",toString: "jijiji")
print(str4)
/**
*/
// 后面那个 # 就是默认参数,可以是第一个，可以出现在函数形式参数的任意位置
func joinString(s1:@H_403_209@String,toString s2:@H_403_209@String,joiner s3:@H_403_209@String = "#") -> @H_403_209@String {
return s1 + s3 + s2
}
func joinString2(s1:@H_403_209@String,joiner:@H_403_209@String = "#") -> @H_403_209@String {
return s1 + joiner + s2
}
