Visual Basic for Applications Reference
ReDim [Preserve] varname(subscripts) [Astype] [, varname(subscripts) [Astype]] . . .
The ReDim statement syntax has these parts:
|Preserve||Optional. Keyword used to preserve the data in an existing array when you change the size of the last dimension.|
|varname||Required. Name of the variable; follows standard variable naming conventions.|
|subscripts||Required. Dimensions of an array variable; up to 60 multiple dimensions may be declared. The subscriptsargument uses the following syntax:
[lowerTo] upper [,[lowerTo] upper] . . .
When not explicitly stated in lower, the lower bound of an array is controlled by the OptionBase statement. The lower bound is zero if no OptionBase statement is present.
|type||Optional. Data type of the variable; may be Byte, Boolean, Integer, Long, Currency, Single, Double, Decimal(not currently supported), Date, String (for variable-length strings), String * length (for fixed-length strings), Object, Variant, a user-defined type, or an object type. Use a separate Astype clause for each variable being defined. For a Variant containing an array, type describes the type of each element of the array, but doesn't change the Variant to some other type.|
The ReDimstatement is used to size or resize a dynamic array that has already been formally declared using a Private, Public, or Dim statement with empty parentheses (without dimension subscripts).
You can use the ReDim statement repeatedly to change the number of elements and dimensions in an array. However, you can't declare an array of one data type and later use ReDim to change the array to another data type, unless the array is contained in a Variant. If the array is contained in a Variant, the type of the elements can be changed using an Astype clause, unless youre using the Preserve keyword, in which case, no changes of data type are permitted.
If you use the Preserve keyword, you can resize only the last array dimension and you can't change the number of dimensions at all. For example, if your array has only one dimension, you can resize that dimension because it is the last and only dimension. However, if your array has two or more dimensions, you can change the size of only the last dimension and still preserve the contents of the array. The following example shows how you can increase the size of the last dimension of a dynamic array without erasing any existing data contained in the array.
ReDim X(10, 10, 10) . . . ReDim Preserve X(10, 10, 15)
Similarly, when you use Preserve, you can change the size of the array only by changing the upper bound; changing the lower bound causes an error.
If you make an array smaller than it was, data in the eliminated elements will be lost. If you pass an array to a procedure by reference, you can't redimension the array within the procedure.
When variables are initialized, a numeric variable is initialized to 0, a variable-length string is initialized to a zero-length string (""), and a fixed-length string is filled with zeros. Variant variables are initialized to Empty. Each element of a user-defined type variable is initialized as if it were a separate variable. A variable that refers to an object must be assigned an existing object using the Set statement before it can be used. Until it is assigned an object, the declared object variable has the special value Nothing, which indicates that it doesn't refer to any particular instance of an object.
*Caution* The ReDim statement acts as a declarative statement if the variable it declares doesn't exist at module level or procedure level. If another variable with the same name is created later, even in a wider scope, ReDim will refer to the later variable and won't necessarily cause a compilation error, even if Option Explicit is in effect. To avoid such conflicts, ReDim should not be used as a declarative statement, but simply for redimensioning arrays.
*Note* To resize an array contained in a Variant, you must explicitly declare the Variant variable before attempting to resize its array.