title: Concatenate variables in terraform V0.12
body: <p>I'm trying to update my terraform files from V0.11 to V0.12 and I have some questions.</p>
  
  <p>What's the best way to concatenate variables with strings? </p>
  
  <p>In V0.11 I use this: <code>${var.name}-STRING-${var.name2}</code>, in V0.12 can I use this: <code>var.name"-STRING-"var.name2</code> or must I use another ways to concatenate variables and strings? </p>