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Tip of the Day
Language: Visual Basic
Expertise: Beginner
Jan 5, 2002



Building the Right Environment to Support AI, Machine Learning and Deep Learning

Return Empty Arrays Too

With VB6 came the ability to return arrays from functions. Returning an uninitialized array is a problem because there is no easy way—other than error-trapping—to find whether an array has been dimensioned. Also, ReDim myArr(-1) does not work. You can use the Split function to return an empty array—one with no elements and no data&$151;and an LBound of 0 and an UBound of -1. This practice simplifies code for looping through the returned array:
Private Function Foo(args...) As String()
Dim myArr() As String
' Initialize array dimensions as 0 to -1
myArr = Split("")
If Condition Then
ReDim myArr(n)
' further processing...
End If
Foo = myArr
End Function

Here, no additional checking is required to use Foo. But omitting the call to Split can lead to a "Subscript out of range" error in a routine that attempts to use Foo
Anand Likhite
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