Code Explanation of SplitAddress Function

The provided code is written in Visual Basic for Applications (VBA) and defines a function named SplitAddress. This function is designed to parse a complete address string and return specific parts based on the provided index.

Function Signature

Function SplitAddress(completeAddress As String, indexNum As Integer) As String

• Parameters:

  • completeAddress: A string containing the full address that needs to be split.
  • indexNum: An integer indicating which part of the address to return.

• Return Type: The function returns a string that corresponds to the requested part of the address.

Breaking Down the Code

Variable Declaration

Dim addressParts As Variant

• This line declares a variable named addressParts of type Variant, which can hold an array. It will store the split components of the complete address.

Splitting the Address

addressParts = Split(completeAddress, " ")

• Here, the Split function is used to divide completeAddress into smaller parts based on spaces (" "). Each part of the address is stored in the addressParts array.

Select Case Structure

The Select Case statement allows branching depending on the value of indexNum.

Case 1: Street Name and Number

Case 1 ' Street name and number
    SplitAddress = addressParts(0) & " " & addressParts(1)

• This case concatenates the first two elements of the addressParts array and assigns the result to SplitAddress. This output represents the street name and number.

Case 2: Unit Type

Case 2 ' Unit type
    If UBound(addressParts) > 2 Then
        SplitAddress = addressParts(2)
    Else
        SplitAddress = ""
    End If

• If indexNum is 2, the function checks if the array has more than three elements (i.e., UBound(addressParts) > 2). If true, it returns the third element (unit type); otherwise, it returns an empty string.

Case 3: Unit Number

Case 3 ' Unit number
    If UBound(addressParts) > 3 Then
        SplitAddress = addressParts(3)
    Else
        SplitAddress = ""
    End If

• This case functions similarly to Case 2 but focuses on the fourth element (unit number). The check ensures that there are at least four parts in the address array.

Default Case

Case Else
    SplitAddress = "Invalid index"

• If indexNum is not 1, 2, or 3, the function returns "Invalid index", indicating that the request is outside the expected range.

Key Concepts Explained

Split Function

• The Split function divides a string into an array of substrings based on a specified delimiter. In this case, the delimiter is a space (" "), enabling logical separation of different address components.

Select Case

• This control structure simplifies conditional branching for multiple discrete values. It improves code readability compared to using multiple If...ElseIf statements.

UBound

• The function UBound returns the highest available subscript (or index) in an array. It is useful for determining the length of the array and ensuring that the requested index exists within bounds.

Additional Examples

1. Example Usage:

Assuming the complete address is "123 Main St Apt 4B", the function calls would look like this:

• SplitAddress("123 Main St Apt 4B", 1) returns "123 Main".
• SplitAddress("123 Main St Apt 4B", 2) returns "Apt".
• SplitAddress("123 Main St Apt 4B", 3) returns "4B".

2. Handling Variable Formats:

If the address structure is inconsistent, the function may need to handle edge cases more robustly. For instance, you could include additional logic to manage addresses without units or street types.

Conclusion

The SplitAddress function provides a clear and effective method for parsing a structured address string into its constituent parts. Understanding how each component works enhances your ability to manipulate and process string data in VBA. For more in-depth learning on similar topics, consider exploring courses on the Enterprise DNA Platform.