利用 for-in 循环来遍历字符串中的每一个字符:
for character in "hello word!" {
println(character)
}
使用countElements() 函数计算字符串长度
println(countElements("hello word!"))
使用hasPrefix 和 hasSuffix 方法来判断字符串的前缀和后缀是否相等
let romeoAndJuliet = [
"Act 1 Scene 1: Verona, A public place",
"Act 1 Scene 2: Capulet's mansion",
"Act 1 Scene 3: A room in Capulet's mansion",
"Act 1 Scene 4: A street outside Capulet's mansion",
"Act 1 Scene 5: The Great ......
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