findCube()

Step 1: Understanding the Function

Before we dive into the code, we have to understand what finding the cube of a number means. Simply put, we need to multiply the number by itself 3 times. For example, if we are given a number 4, the cube will be 4x4x4 = 64.

var number = 4
var cube = number * number * number
print(cube) // 64

Step 2: Creating the Function

Now that we understand how to calculate the cube of a number, we can turn this into a function that takes an integer as an argument and returns its cube. Swift syntax makes this quite simple.

func cube(number: Int) -> Int {
    return number * number * number
}

Step 3: Testing the Function

Let's test our function with number 4. It should return 64 as we previously discussed.

print(cube(number: 4)) // 64

Step 4: Refactoring the Function

Although the function is working as expected, we might want to refactor it a bit to use the Swift power operator **. This operator allows us to raise a number to a certain power. Since the cube is the number raised to the power of 3, we can simplify our function.

func cube(number: Int) -> Int {
    return number ** 3
}

Step 5: Testing the Refactored Function

To validate that our refactored function works correctly, let's test it again with the same number as before.

print(cube(number: 4)) // 64

Conclusion:

We've successfully created a function in Swift to find the cube of a number. First we understood the concept, then we wrote the initial function and tested it. We then refactored the function to make it more elegantly and performed the final test. Here is our final implementation.

func cube(number: Int) -> Int {
    return number ** 3
}