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vba string array
'In VBA a dynamic string array is declared in the following ways: Dim strArr1() As String Dim strArr2$() 'Neither declaration style is prefered. They are exactly equivalent. 'Both ways above produce a dynamic array, which means that the exact size of 'the array (how many elements) is specified later in code: Redim strArr1(1 to 10) 'To instead declare a static string array (an array with a fixed size), 'specify the size within the Dim statement: Dim strArr1(1 to 10) As String Dim strArr2$(0 to 4) 'ReDim() cannot later be used on static arrays. Their size is fixed. 'Once a string array is declared, the array elements are assign one at a time: strArray1(1) = "abc" 'However, the Split() function can be used to split a string and assign to and 'to also size a dynamic string array in one go: Dim strArr3$() strArray3 = Split("a,b,c", ",") 'strArray3 will now contain three elements, "a", "b", and "c". 'Note: String arrays can only conatin text values. When numbers are assigned ' to string array elements, the number is first coerced to a string value. ' Boolean and Date values are likewise coerced to text values. ' Objects CANNOT be assinged to string array elements. ' ' For the above reasons (and especially with Excel data) it may be better ' to declare and use Variant arrays instead of String arrays. Variants ' can be assigned any data type. The trade-off is that manipulating ' Variants is slightly slower than base data types. ' ' Variants are the default data type in VBA so the following declares ' an array of Variants: Dim vArr1() ' But the data type may also be specified explicitly: Dim vArr1() As Variant ' The Variant data type does not have a specific Type Declaration Character. ' For example, the String data type has the '$' type declaration character ' which was demonstrated at the top of this page. But since the Variant is ' VBA's default, no type declaration character is needed. Not specifying ' a type results in a variable's type being a Variant, by default. 'Note: it is important to realize that since a Variant can hold any other type ' of data, it can also hold an array. It is EXTREMELY common in VBA to ' declare a single Variant variable that will later be assinged an array: Dim v ' The above variable is a single Variant. It is not an array. Variants ' can be assinged numbers, dates, Booleans, error values, objects, ' essentially anything. And in addition, variants can also ' be assigned arrays of any type: v = Array(1, 2, 3, "a", "b", "c", True, False, #1/1/2021#) ' The above line creates an array of 9 Variant values and assigns the ' entire array to the Variant existing variable, 'v'. ' ' Perhaps the most common way to assign an array of Variants to ' an existing Variant variable is to pull data from a worksheet range: v = Sheet1.Range("A1:A10").Value ' The above statement assigns a 2-dimension array to v, ten rows deep ' and one column wide. The values and data types of the ' ten elements will correspond to the values and types ' in the Sheet1 range, A1:A10. It is important to realize that ' the VBA array created here is a copy of the data in the worksheet ' range. Changing one does not affect the other. But it is possible ' to write the VBA array back to Excel to the original range, or ' to any range in any worksheet in any open workbook. ' ' '
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