terraform 11 and "concat" function: parse error

Question

TF v.0.11 (I know it is old but I need this one)

I try to configure output this way:

value = "${concat(aws_lambda_function.lambda.*.arn, [""])}"

The error message is

Error reading config for output FUNCTION_ARN: parse error at 1:46 : expected expression but found "["

What am I doing wrong, how to fix that?

Answer 1

Reason: [""] don't work for v11.

Solution:

value = "${element(concat(aws_lambda_function.lambda.*.arn, list("")), 0)}"