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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.
'
'
'
Source: academy.excelhero.com
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