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

Last update on December 21 2024 10:29:15 (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

Swift Programming Code Editor:

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