findStringLenght()

Step 1: Declare a Function

First, you need to declare a function which is going to calculate the length of a string. TypeError: The function declaration in Swift begins with the 'func' keyword followed by the name of the function. We'll name our function 'stringLength'.

func stringLength(string: String) {}

The function 'stringLength' takes one parameter 'string' of String type.

Step 2: Calculate the String Length

In Swift, you can use the 'count' property of the string to get the length of the string. This property returns the number of 'Character' instances in a string.

func stringLength(string: String) {
    let length = string.count
}

Step 3: Return the Length of the String

Now, you need to return the value of the 'length' variable from the function. In Swift, you use the 'return' keyword to return a value from a function.

func stringLength(string: String) -> Int {
    let length = string.count
    return length
}

The function now returns an Int that represents the length of the string.

Step 4: Test the Function

Let's test our function by calling it with a string.

let length = stringLength(string: "Hello World!")
print(length)  // Output: 12

In this example, the function 'stringLength' correctly returned the length of the string 'Hello World!'.

Conclusion

In this post, we've created a simple Swift function that calculates the length of a string. This function uses Swift's built-in 'count' property of the 'String' type, which makes the implementation straightforward and easy.

Here's the full code:

func stringLength(string: String) -> Int {
    let length = string.count
    return length
}

let length = stringLength(string: "Hello World!")
print(length)  // Output: 12