Question

I have a For Each loop that is looping through an array of strings to find the first string with a length of three characters. For example, when looping through the array, if the first 3 character string is the 4th index of the array, I would like for it to return the 3rd (previous) index of the array. Any help would be appreciated.

For Each piece As String In p
        If piece.Length = 3 Then
            'Return previous index
        End If
Next

Answer 1

You have a couple of options.

If p is a collection accessible by index (ie: IList(Of T)), you can switch to a For loop, and return the element at the current index -1.

Otherwise, you can keep the previous item in a separate variable, and return it when your condition is met.

Dim lastItem as String
For Each piece As String In p
    If piece.Length = 3 Then
        Return lastItem ' Will return Nothing if this is the first item...
    End If
    lastItem = piece ' Store this for next time
Next