JOIN

JOIN(sourcearray [,delimiter])

Returns a text string containing all the elements in an array (String).

sourcearray	The array of strings (String).
delimiter	(Optional) The text string to use as a separator (String).

REMARKS

* After you have finished processing an array that has been split you can use this function to concatenate the elements of an array back to a string concatenation.
* The "sourcearray" must be a 1-dimensional array.
* The "sourcearray" can be zero-based or one-based ?
* If "delimiter" is left blank, then the space character (" ") is used.
* If "delimiter" = "" (zero length string) then all the items are concatenated with no separator character.
* Doesn't work when the array is declared as "Date" data type (eg Dim vaArray(5) As Date).
* Does work when the array is declared as "Variant" data type (eg Dim vaArray(5) As Variant).
* This function cannot be used with fixed length arrays. You will see the following compile-time error: 'Can not assign or coerce array of fixed-length string or user defined type to Variant'.
* You can use the ARRAY function to return an array containing specific values.
* You can use the FILTER function to return an array containing a subset of a string array based on a filter condition.
* You can use the SPLIT function to return an array containing a specified number of substrings.
* The equivalent .NET function is Microsoft.VisualBasic.Strings.Join
* For the Microsoft documentation refer to learn.microsoft.com

Dim aValues() As String 
aValues(0) = "string1" 
aValues(1) = "string2" 
aValues(2) = "string3" 

Debug.Print Join(aValues)        '= "string1 string2 string3"  
Debug.Print Join(aValues," ")    '= "string1 string2 string3"  
Debug.Print Join(aValues, "<>")  '= "string1<>string2<>string3"  
Debug.Print Join(aValues, "")    '= "string1string2string3"  

Dim aComponents(2) As String 
aComponents(0) = "C:" 
aComponents(1) = "temp" 
aComponents(2) = "myfile" 

Dim sFullPath As String 
sFullPath = Join(aComponents,"\") & ".txt" 
Debug.Print sFullPath            '= "C:\temp\myfile.txt"