Reverse Digits in Swift()

Step 1: Understand the Problem

First, we need to understand what reversing a number means. This means taking a number like 123 and changing it to 321. Essentially, we are flipping the order of the digits.

Step 2: Sketch a Plan

The Swift language does not allow us to directly reverse an integer, so we need to convert it into a string first. Once our number is a string, we can use the reversed() function to flip the digits. After that, we'll need to convert it back to integer.

Here's our initial function layout:

func reverseDigits(n: Int) -> Int {
    // Convert integer to string
    
    // Reverse the string
    
    // Convert string back to integer
    
    return 0    
}

Step 3: Convert Integer to String

You can convert an integer to a string in Swift using the String() initializer.

Here's how we add this to our function:

func reverseDigits(n: Int) -> Int {
    let stringNum = String(n)
    return 0
}

Step 4: Reverse the String

To reverse our string, we can use the reversed() function in Swift. We'll also need to convert our reversed string back to a new string.

Here's how we add this:

func reverseDigits(n: Int) -> Int {
    let stringNum = String(n)
    let reversedNum = String(stringNum.reversed())
    return 0
}

Step 5: Convert String Back to Integer

Finally, we need to convert our string back to an integer. Let's use the Int() initializer for this.

Here is the final solution.

func reverseDigits(n: Int) -> Int {
    let stringNum = String(n)
    let reversedNum = String(stringNum.reversed())
    return Int(reversedNum) ?? 0
}