Append a variant of strings to an empty variant array - vba

Question

I would like to repeatedly append an array of string values to a master array, which is initially empty. I cannot get it to append.
Sub main()
Dim num As Integer, root As String, pathToFile As String, allOf As Variant, someOf As Variant
Dim i As Integer, opts() As String, val As Integer
root = Application.ActiveWorkbook.Path
pathToFile = root & "\" & "name" & ".txt"
num = 5 ' the number of files I may have
For i = 0 To num - 1 ' loop over all the files
ReDim Preserve opts(i)
someOf = read_whole_file(pathToFile) ' read the file into variant
For val = LBound(someOf) To UBound(someOf) ' run through the array
' -- append someOf to allOf and loop
Dim Nmbr As Integer
On Error Resume Next
Err.Clear
If allOf.Value = "Empty" Then
Nmbr = UBound(allOf)
allOf(0) = someOf(0)
Else
ReDim Preserve allOf(UBound(allOf) + 1)
allOf(UBound(allOf)) = someOf(val)
End If
Next val
Next i
End Sub
Function read_whole_file(filePath As String) As Variant
Dim sWhole As String
Open filePath For Input As #1
sWhole = Input$(LOF(1), 1)
Close #1
read_whole_file = Split(sWhole, vbNewLine)
End Function
Contents of the text file :
"
Hello
This
Is a
Text
File
"

Answer 1

This is VBA. DOn't use an array use a collection.
Sub main()
Dim num As Integer, root As String, pathToFile As String, allOf As Collection, someOf As Variant
Set allof = new collection
Dim i As Integer, opts() As String, val As Variant
root = Application.ActiveWorkbook.Path
pathToFile = root & "\" & "name" & ".txt"
num = 5 ' the number of files I may have
For i = 0 To num - 1 ' loop over all the files
someOf = read_whole_file(pathToFile) ' read the file into variant
For Each val In someOf ' run through the array
alloff.Add val
Next
Next i
End Sub

Answer 2

In your code, you say you have 5 files:
num = 5 ' the number of files I may have
but you set the path_to_file immediately before this. More importantly, you do not change path_to_file within the loop, nor do you pass any modifier to read_whole_file. So you code will read from the same file 5 times.
You also don't set any value to allOf before you use it. You don't even identify what type it is (apart from Variant), so checking .Value is meaningless and should result in a compile error. Because of your On Error statement, that section is probably being ignored, thus the intended action is not occurring.
How to fix:
Add Option Explicit at the top of the module. Always.
Remove the On Error handling - if you think you may have some out of bounds issues, then cater for it in the program logic.
Bonus: Instead of ReDimming opts(I) each time in the loop, you already know how many iterations, so only ReDim it once before entering the loop.