What’s new in Strings in Swift 4?

The Swift 4 which is default in Xcode 9. So you have to download Xcode 9. if you have Xcode 8.3 then you can also installed Swift 4 toolchain.

Multi-line string literals :  You can define the multi-line string using three double-quotes ("""). see the below code.

let multilineString = """
        I am Kirit Modi.
        Working as iOS Developer.
        Having 5+ Year experience iOS development.
        Currently working also in React Native.
    """
print(multilineString)

Escaping newlines in string literals: 

Add the backslash ( \ ) at the end of the line to escape new lines in the multi-line string literals.

let escapedNewline = """
    I am Kirit Modi, \
    Working as iOS Developer.
    """
print(escapedNewline)

String is a Collection :  The biggest change is that string is a Collection. Swift 1 also is a collection. see the code of for-in loop to get characters from string.

let greeting = "Kirit, M😜d!"
greeting.count
for char in greeting {
    print(char)
}

Unicode 9: The Swift 4 supports unicode 9. now the issue of the number of count of unicode is also resolve in swift 4.0.

"👧🏽".count // person + skin tone; in Swift 3: 2 Swift 4 : 1
"👨‍👩‍👧‍👦".count // family with four members; in Swift 3: 4 Swift 4 : 1
"👱🏾\u{200D}👩🏽\u{200D}👧🏿\u{200D}👦🏻".count // family + skin tones; in Swift 3: 8 Swift 4 : 1
"👩🏻‍🚒".count // person + skin tone + profession; in Swift 3: 3 Swift 4 : 1
"🇨🇺🇬🇫🇱🇨".count // multiple flags; in Swift 3: 1 Swift 4 : 3

Character.unicodeScalars property:

The You can access the code point of character directly without to convert it to a string.

let c: Character = "🇪🇺"
Array(c.unicodeScalars)
let d: Character = "🇬🇫"
Array(d.unicodeScalars)

String Slice: 

There is a new way to Splice the original string. you can see the below code to Slice the string.

let greeting = "Kirit, M😜d!"
let comma = greeting.index(of: ",")!
let substring = greeting[..<comma]

Please add comment to improve or any missing in the article. 

Thanks.