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Another question: After creating subnets my functions returns []*ec2.Subnet, but in ElasticBeanstalk I need to add them to EnvironmentSettingArray with EnvironmentSettingArgs {Name: pulumi.String("Subnets"), NampeSpace: pulumi.String("aws:ec2:vpc"), Value: pulumi.String("subnetid1,subnetid2,subnetid3")}
However how can I create a comma seperated string from the array, as when I do fmt.Sprintf("%v,%v,%v",subnet[0].ID(),subnet[1].ID(),subnet[2].ID())  I only get the pointers, not the real value as this is filled at deployment time and not after creation.

you likely want `pulumi.Sprintf` which works similarly to `fmt.Sprintf` but knows to wait for outputs to resolve before formatting the string - See <https://www.pulumi.com/docs/intro/concepts/programming-model/#outputs-and-strings>

How could I have missed this, thanks for the help. It worked.