One of the commonly used connectors to perform operations in Flow is Data Operations

To describe this action in simpler terms, it is “Joining values in an array with a value”.

Join

Here’s how you can use the Join operation in Power Automate

1. Look for Data Operations connector in Power Automate.
   
   
2. In Join, you’ll see that you’ll need two fields that takes a source and by what character you want to Join into the String result this Action will output.
   
   
3. Example – I want to Join numbers by a hyphen “-“. Here’s how it can be done.
   Here’s how my From and Join With fields will be populated.
   
   
4. And this will return a String value by joining the items in the array by the value we entered in Join With.
   
   
   To be sure this is string, you can click on Show raw outputs and see the results
   
   
   Hope this was useful!

Here are some more Power Automate / Flow posts you might want to check out –

1. Retrieve Metadata of Global OptionSets from Dynamics 365 in Power Automate | HTTP with Azure AD action
2. Primary Key of Activity type entity in a Dataverse connector in Power Automate | Quick Tip
3. Split On in Power Automate in SharePoint trigger for Item updates
4. Search Rows (preview) Action in Dataverse connector in a Flow | Power Automate
5. Suppress Workflow Header Information while sending back HTTP Response in a Flow | Power Automate
6. Invalid XML issue in Dataverse connector for List Rows action | Fetch XML Query | Power Automate
7. FetchXML Aggregation in a Flow using CDS (Current Environment) connector | Power Automate
8. Invalid type. Expected Integer but got Number error in Parse JSON – Error at runtime after generating Schema | Power Automate
9. Asynchronous HTTP Response from a Flow | Power Automate
10. Setting Lookup in a Flow CDS Connector: Classic vs. Current Environment connector | Power Automate Quick Tip

Thank you!