swift string String usage
- 2020-06-03 08:32:27
- OfStack
swift string String usage
1, the statement
var str = "Hello, playground"
//var str: String = "Hello, playground"
// An empty string
let emptyString = ""
let emptyString2 = String()
// use String() Initializing string
let str2 = String("Hello, swift")
2. Determine if the string is empty
// Determine empty string
str.isEmpty //false
emptyString.isEmpty //true
3. String concatenation
// String The glue
let mark = "!!!"
str + mark //Hello, playground!!!
str //Hello, playground
// constant String And variables String
str += mark
str //Hello, playground!!!
//str2 += mark //let complains
4. String interpolation
// String interpolation
let name = "lxy"
let age = 18
let height = 1.78
let s = "My name is \(name), I'm \(age) years old. I'm \(height) meters tall."
print(s) //My name is lxy, I'm 18 years old. I'm 1.78 meters tall.
5. Special characters
// Special characters
let s = "\\" =>\
let s = "\"" =>"
let s = "\n" => A newline
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