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frontend/node_modules/underscore/modules/difference.js

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+import restArguments from './restArguments.js';
+import flatten from './_flatten.js';
+import filter from './filter.js';
+import contains from './contains.js';
+
+// Take the difference between one array and a number of other arrays.
+// Only the elements present in just the first array will remain.
+export default restArguments(function(array, rest) {
+  rest = flatten(rest, true, true);
+  return filter(array, function(value){
+    return !contains(rest, value);
+  });
+});