Get the last character of a string without using array?

I have a string

let stringPlusString = TextBoxCal.text

I want to get the last character of stringPlusString. I do not want to use array.

Java has charAt but I could not find something similar in Swift

Using last to get the last Character

For Swift 4:

let str = "hello world😍"
let lastChar = str.last!   // lastChar is "😍"

For Swift 2 and Swift 3:

let str = "hello world😍"
let lastChar = str.characters.last!   // lastChar is "😍"

For Swift 1.2:

let str = "hello world😍"
let lastChar = last(str)!   // lastChar is "😍"

---

Subscripting the String to get the last Character

This works for Swift 3 and Swift 4:

let str = "hello world😍"
let lastChar = str[str.index(before: str.endIndex)]   // lastChar is "😍"

And for Swift 1.2 and Swift 2:

let str = "hello world😍"
let lastChar = str[str.endIndex.predecessor()]   // lastChar is "😍"

Swift 4:

First some char Last some char

let strOSName = "mac operating system"
print(strOSName.prefix(3))       //first char. o/p:  MAC
print(strOSName.suffix(6))       //last char.  o/p:  system

"Without using Array on swift"

Here you go:

var text = "Lorem ipsum"
var lastChar = text.substringFromIndex(text.endIndex.predecessor())

    let text = "Muhammad Raza"
    println("\(text[advance(text.endIndex, -1)])")

in Short !

Details

• Swift 5.1, Xcode 11.2.1

Solution

extension String {
    func onlyLastCharacters(_ count: Int) -> String { return String(suffix(count)) }
    func onlyLastCharacters(_ count: Int, checkLength: Bool) -> String? {
        if checkLength {
            if self.count >= count { return onlyLastCharacters(count) }
            return nil
        }
        return String(suffix(count))
    }
}

Usage

str.onlyLastCharacters(6)
str.onlyLastCharacters(13, checkLength: true)

Full sample

> Do not forget to paste here the solution code

var testNumber = 0
func show(original: String, modified: String?) {
    testNumber += 1
    if let string = modified {
        print("\(testNumber). Original: \"\(original)\", modified: \"\(string)\"")
    } else {
        print("\(testNumber). nil | count: nil")
    }
}

var str = "Hello world!"
show(original: str, modified: str.onlyLastCharacters(6))
show(original: str, modified: str.onlyLastCharacters(12))
show(original: str, modified: str.onlyLastCharacters(13, checkLength: false))
show(original: str, modified: str.onlyLastCharacters(13, checkLength: true))

str = ""
show(original: str, modified: str.onlyLastCharacters(10))
show(original: str, modified: str.onlyLastCharacters(10, checkLength: true))
show(original: str, modified: str.onlyLastCharacters(10, checkLength: false))

Log

1. Original: "Hello world!", modified: "world!"
2. Original: "Hello world!", modified: "Hello world!"
3. Original: "Hello world!", modified: "Hello world!"
4. nil | count: nil
5. Original: "", modified: ""
6. nil | count: nil
7. Original: "", modified: ""

Here is another shorter way to get the last letter from string:

let text = "some string"
last(text) // returns {Some "a"}

The method last() returns an optional Character.