Swift Basic Programming Exercise: Create a new string where all the character "a" have been removed except the first and last positions

Last update on December 21 2024 10:30:10 (UTC/GMT +8 hours)

Write a Swift program to create a new string where all the character "a" have been removed except the first and last positions.

Pictorial Presentation:

Sample Solution:

Swift Code:

import Foundation
func string_a(_ input: String) -> String {
    var chars = input
    let index_start = chars.index(after: chars.startIndex)
    let index_end = chars.index(before: chars.endIndex)
    let middleRange = index_start ..< index_end
    
    var sub_string = chars.substring(with: middleRange)
    
    while sub_string.characters.contains("a") {
        sub_string.remove(at: sub_string.characters.index(of: "a")!)
    }
    
    chars.replaceSubrange(middleRange, with: sub_string)
    
    return String(chars)
}

print(string_a("abcd"))
print(string_a("abcda"))
print(string_a("aabcdaa"))
print(string_a("aabaaaacdaa"))

Sample Output:

abcd
abcda
abcda
abcda

Swift Programming Code Editor:

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