上查看所有课程
joined() 方法返回一个新字符串，其中包含用指定分隔符连接的给定元素。
示例
var str = ["I", "love","Swift"]
// join strings with space between them
var joinedStr = str.joined(separator:" ")
print(joinedStr)
// Output: I love Swiftjoined() 语法
joined() 的语法是
string.joined(separator: delimiter)此处，string 是 String 类的一个对象。
joined() 参数
joined() 方法接受一个参数
- delimiter - 用于连接元素的定界符
注意：如果我们调用不带任何参数的 joined()，字符串将不带任何分隔符连接。
joined() 返回值
- 返回连接后的字符串
示例：Swift joined()
var str = ["Swift", "Java", "JavaScript"]
// join strings with no separator
var join1 = str.joined()
// join strings with space between them
var join2 = str.joined(separator:" ")
// join strings with comma between them
var join3 = str.joined(separator:", ")
print(join1)
print(join2)
print(join3)输出
SwiftJavaJavaScript Swift Java JavaScript Swift, Java, JavaScript