Delete Suffix Substring from Given String in Swift

To delete the suffix substring from the given string first, we check if the given substring is present in the specified string or not using the inbuilt hasSuffix() function. Then find the index of the suffix substring using the inbuilt index() function and finally remove the suffix substring.

Input

String = "Siya love cooking"
Substring = "cooking"

Output

"Siya love"

Here, the specified substring is found in the given string, so in the resultant string, we removed the substring from the end of the input string.

Algorithm

• Step 1 ? Create a string.

• Step 2 ? Create a substring.

• Step 3 ? Check if the string ends with the specified substring.

• Step 4 ? If yes, then calculate the index to stop deleting using the index() function. Here we pass a negative count of the suffix substring as the offset to indicate the position to stop deleting.

• Step 5 ? Now we extract a substring using a string slicing operation from the input string but does not include the specified index. And convert the return result into a string using the String() function.

• Step 6 ? Print the output.

Example

In the following Swift program, we will delete the suffix substring from the given string. So create a string and the substring. Then check if the specified substring is present in the given string or not. If yes, then find the index to stop deleting with the help of the index() function. Then use string slicing to exact the substring starting from the input string but not including the specified index, then we will create a new string using String() initializer with the extracted substring. And finally, we will print the output. If the substring does not present, then return "string not found".

import Foundation
import Glibc

let str = "Sky is blue" 
let suffixStr = " blue" 

print("Original String:", str)

// Checking if the string ends with the 
// suffix substring or not
if str.hasSuffix(suffixStr) {
   // Find the index to stop deleting at
   let LIndex = str.index(str.endIndex, offsetBy: -suffixStr.count)
    
   // Removing the suffix substring
   let modifyStr = String(str[..<LIndex])
    
   print("Modified String:", modifyStr)
} else {
   print("String not found")
}

Output

Original String: Sky is blue
Modified String: Sky is

Conclusion

So this is how we can delete suffix substring from the given string. This is the most efficient method to remove a substring from the end of the input string. With some minor changes in the code, you can also remove a character from the end of the string.