Swift String Exercises: Create a string made of two copies of the last two characters of a given string

Last update on June 14 2025 13:04:47 (UTC/GMT +8 hours)

Write a Swift program to create a string made of two copies of the last two characters of a given string. The given string length must be at least 2.

Pictorial Presentation:

Sample Solution:

Swift Code:

import Foundation
func new_string(_ str: String) -> String {
    var result = ""
    var last_two_index = str.endIndex
    
    for _ in 0..<2 {
        last_two_index = str.index(before: last_two_index)
    }
    
    let last_2_chars = str.substring(from: last_two_index)
    
    for _ in 0..<2 {
        result.append(last_2_chars)
    }
    
    return result
}

print(new_string("Swift"))
print(new_string("Python"))
print(new_string("Java"))

Sample Output:

ftft
onon
vava

Go to:

• Swift String Programming Exercises Home ↩
• Swift Programming Exercises Home ↩

PREV : Write a Swift program to insert a given string to another given string where the second string will be in the middle of the first string.
NEXT : Write a Swift program to create a new string made of a copy of the first two characters of a given string. If the given string is shorter than length 2, return whatever there is.

Swift Programming Code Editor:

Improve this sample solution and post your code through Disqus