' The array x has not been previously declared,
' so ReDim automatically assigns it the data type Variant.
ReDim x(5)
Print DataType(x(1))                  ' Prints 0.

' The Dim statement declares array y with the
' data type String.
Dim y() As String

' The ReDim statement can’t change the data type of an
' existing  array. If you specify a data type for array y in
' the ReDim statement, it must be String.

ReDim y(5) As String
Print DataType(y$(1))                 ' Prints 8.

Example 2

Option Base 1
' Declare a two-dimensional dynamic array, of Variant type.
ReDim markMar(2, 2)

' Assign a value to each element.
markMar(1, 1) = 1
markMar(2, 1) = 2
markMar(1, 2) = 3
markMar(2, 2) = 4

' Change the upper bound of the last dimension of markMar
' from 2 to 3, preserving the values already stored in
' existing elements of markMar.
ReDim Preserve markMar(2,3)

' Assign values to the additional elements of markMar.
markMar(1, 3) = 5
markMar(2, 3) = 6

See Also

ReDim statement

Glossary