Variable of type array cannot be initialized or updated with value of type string. Variable supports only types of array Power Automate

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Posted on by KrishR

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Hello Power users,

I'm stuck at an issue assigning value to an array variable. Here're the steps that has my flow.

Step1: Initialized a variable of type string with name "VarVariable"

Step2: Initialized a variable of type array with name "ArrayVariable"

Step 3: Added string value to VarVariable, let's say the string is ' Need help with something, can someone help me '

Step 4: Composed the variable with Split action to convert to array format with expression "Split(variables('VarVariable'),',')".

Step 5: Assigned it to Array Variable with the output from above composed action. This is where I see error while testing.

Not sure what I'm missing. Can someone please help me?

Thank you so much in advance!

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efialttes 14,756 on at

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Re: Variable of type array cannot be initialized or updated with value of type string. Variable supports only types of array Power Automate

Hi @KrishR !
So your challenge is how to add an item to an Array of type string, right?
If my understanding is correct, you can do it by means of 'append to array' action block

Hope this helps!

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KrishR 431 on at

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Re: Variable of type array cannot be initialized or updated with value of type string. Variable supports only types of array Power Automate

Hi @efialttes ,

Thanks for the help. Actually, I'm trying to initialize two variables, one with type String and another with Array. I have string value coming from a Sharepoint column and converting it to array so that I can assign it to variable of type array.

Additional steps I followed are mentioned above. Hope I answered your question.

Thanks again!

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efialttes 14,756 on at

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Re: Variable of type array cannot be initialized or updated with value of type string. Variable supports only types of array Power Automate

Hi again!
You mention an error while testing. Is your flow terminated with an execution error? Or is the flow executed successfully, but the new array variable is not storing what you expect?

Next
What dynamic content/EDL expression are you assigning to your VarVariable of tipe string? What's the value of your SP column field when you test and experience an error?

If your SP column field has at least one character, the WDL expression you shared should work fine. Please note single quotes '' are needed around the comma, if you use ´´ instead, Flow editor will report that the expression is invalid.

If your SP column field is empty, when executing your flow it will probably fail; please have a look to this thread for an expression identifying empty SP column value
https://powerusers.microsoft.com/t5/Building-Flows/Condition-when-there-is-nothing-in-a-SharePoint-item-in-a-cell/m-p/2319004
Hope this helps

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efialttes 14,756 on at

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Re: Variable of type array cannot be initialized or updated with value of type string. Variable supports only types of array Power Automate

Hi @KrishR !
Did you manage to overcome your challenge?
If so, my humble suggestion is to please mark this topic as "Solved" by clicking "Accept as a solution". THis way others with the same problem can find a solution faster. Please also note you can even select several responses as solution, even from different community members!

Thanx for your help making this community great!

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