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// map function for objects (instead of arrays)

this.fileNames = Object.keys(items).map(function(index, item) {
  return items[index].name;
}).join(', ');

// https://stackoverflow.com/questions/14810506/map-function-for-objects-instead-of-arrays
// https://stackoverflow.com/questions/16607557/javascript-perform-join-on-value-in-object-array