ReDim [Preserve] name([dimensions])
|Preserve||Preserves the data in an existing array when you change the size of the last dimension.|
|name||Name of the variable, follows standard variable naming conventions.|
|dimensions||Dimensions of an array variable; up to 60 multiple dimensions may be declared. |
The subscripts argument uses the following syntax:
upper_index[, upper_index] ...
The lower index of an array is always zero.
The statement is used to size or resize a dynamic array that has already been formally declared using a Dim statement with empty parentheses (without dimension subscripts). You can use the statement repeatedly to change the number of elements and dimensions in an array.
If you use the Preserve keyword, then 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, then you can resize that dimension because it is the last and only dimension. However, if your array has two or more dimensions, then you can change the size of only the last dimension and still preserve the contents of the array.
ReDim X(10, 10, 10)
ReDim Preserve X(10, 10, 15)
Caution: If you make an array smaller than it was originally, then data in the eliminated elements is lost.
When variables are initialized, a numeric variable is initialized to 0 and a string variable is initialized to a empty string (""). 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.