Swift 中----字符串和字符

//字符串

let someString = "someString"

//初始化空字符串

var empString = ""

var anotherString = String()

//這倆種形式創建的字符串等價均爲空

if empString.isEmpty{

print("這是空的")

}

var cari = "Horse"

var  abc =   someString + cari

print("abc === \(abc)")

/*

 for ac in 0 ... count-1{

 print("第\(ac+1)個人叫\(names[ac])")

 

 }

 

 */

let quo = "Hello World"

let luo = "World,"

if quo == luo{//倆個字符串相等

 

}

//有這個頭

if quo .hasPrefix("Hell"){

}

//有這個尾

if luo.hasSuffix("ld"){

}

//大小寫字符串

let normal = "Cound you help me, please"

let  shouty = normal.uppercased()//將每個字符轉成大寫

let  whis =  normal.lowercased()//將每個字符轉成小寫

print("shouty === \(shouty)")