Merging two maps in Terraform

Is as simple as using merge function:

resource "aws_lambda_function" "example" {
  # ...

  environment {
    variables = merge(
      var.extra_envs,
      {
        EXISTING_ENV = "hello"
      },
    )
  }

when using the module:

    extra_envs = {
      OTHER = "world"
    }

var.extra_envs is a map(string) type here.

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