"use strict";

function displayTopicsPreview(topics) {
  var message = "There are currently " + topics.length;
  
  _displayPreviewMessage(topics, message);
}
"use strict";

function displayTopicsPreview(topics = []) {
  let message = "There are currently " + topics.length;
  
  _displayPreviewMessage(topics, message);
}
Add default parameter value. Replace var -> let
Add default parameter value. Replace var -> let
