DAX: How update a variable value after having defined the variable?

[iplaygod]

I am writing DAX

In most other coding languages, I can define a variable, give it a value, and then later on in the code change or add to that value.
Eg:

VAR myVariable = 1
//later in the code:
myVariable = 2

Is this possible in DAX?
Or can I only set variable values when I define them with the VAR statement?

I want to concatenate strings by adding them onto a string variable.
I can not use CONCATENATEX in this situation.

So I want to do
VAR concatString = ""

//then later in the code
concatString = concatString & "|" & newValue

is this possible? please give me example code if it is.

Also, a sidenote question:
What happens if I re-define a variable with the same name?
Do I then "wipe out" the previous variable with the same variable name?

thanks in advance

[v-yulgu-msft]

Hi @iplaygod,

I don't think we can re-define a variable with the same name. 

If you want to achieve below formula
VAR concatString = ""

//then later in the code
concatString = concatString & "|" & newValue

You may need to define two different variables like this:

VAR concatString = ""
VAR concatString2 = concatString & "|" & newValue

Best regards,

Yuliana Gu

[iplaygod]

ok thanks

so follow-up question...

is it possible to create a variable and naming it by using a string?

like in Power Query (M) language you can use

#"myVariable"

is there a similar alternate syntax for defining / naming variables in DAX?

[v-yulgu-msft · Accepted solution]

Hi @iplaygod,

Hope this document about naming syntax of variable is helpful to you.

Best regards,

Yuliana Gu