Reverse String in Swift()

Step 1: Define a function

Firstly, you need to define a function reverseString that takes a string parameter. This function will hold our code responsible for reversing the string.

func reverseString(input: String) -> String {
}

Step 2: Create an array of characters

The String type in Swift is an ordered collection of characters. Create an array out of your parameter string's characters.

func reverseString(input: String) -> String {
  let characters = Array(input)
}

Step 3: Reverse the array

To reverse the string, you need to reverse the array of characters. Swift array reversed() function makes it very convenient.

func reverseString(input: String) -> String {
  let characters = Array(input)
  let reversedCharacters = characters.reversed()
}

Step 4: Convert back to string

Now you have a reversed array of characters, you need to convert it back to a string. Use the String() initializer to form a string out of the reversed array.

func reverseString(input: String) -> String {
  let characters = Array(input)
  let reversedCharacters = characters.reversed()
  return String(reversedCharacters)
}

Step 5: Test the function

With the function implementation in place, it's time to test it out. Invoke the reverseString(input:) function with a string of your choice and print the result.

print(reverseString(input: "Hello, World!")) // Outputs: "!dlroW ,olleH"

Conclusion

In conclusion, we have created a Swift function that can reverse any given string. The full reverseString implementation looks like this:

func reverseString(input: String) -> String {
  let characters = Array(input)
  let reversedCharacters = characters.reversed()
  return String(reversedCharacters)
}
print(reverseString(input: "Hello, World!")) // Outputs: "!dlroW ,olleH"