3 examples of 'mongoose array of strings' in JavaScript

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function MongooseArray(values, path, doc) {
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  var arr = [].concat(values);
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  utils.decorate( arr, MongooseArray.mixin );
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  arr.isMongooseArray = true;
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  var _options = { enumerable: false, configurable: true, writable: true };
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  var keys = Object.keys(MongooseArray.mixin).
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    concat(['isMongooseArray', 'validators', '_path']);
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  for (var i = 0; i < keys.length; ++i) {
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    Object.defineProperty(arr, keys[i], _options);
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  };
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  arr._atomics = {};
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  arr.validators = [];
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  arr._path = path;
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  // Because doc comes from the context of another function, doc === global
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  // can happen if there was a null somewhere up the chain (see #3020)
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  // RB Jun 17, 2015 updated to check for presence of expected paths instead
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  // to make more proof against unusual node environments
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  if (doc && doc instanceof Document) {
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    arr._parent = doc;
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    arr._schema = doc.schema.path(path);
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  }
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  return arr;
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}

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function MongooseDocumentArray (values, path, doc) {
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  var arr = [];
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  // Values always have to be passed to the constructor to initialize, since
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  // otherwise MongooseArray#push will mark the array as modified to the parent.
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  arr.push.apply(arr, values);
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  arr.__proto__ = MongooseDocumentArray.prototype;
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  arr._atomics = {};
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  arr.validators = [];
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  arr._path = path;
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  if (doc) {
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    arr._parent = doc;
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    arr._schema = doc.schema.path(path);
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    doc.on('save', arr.notify('save'));
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    doc.on('isNew', arr.notify('isNew'));
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  }
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  return arr;
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};

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function MongooseDocumentArray (values, path, doc) {
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  var arr = [];
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  arr.push.apply(arr, values);
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  arr.__proto__ = MongooseDocumentArray.prototype;
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  arr._atomics = {};
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  arr.validators = [];
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  arr._path = path;
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  if (doc) {
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    arr._parent = doc;
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    arr._schema = doc.schema.path(path);
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    doc.on('save', arr.notify('save'));
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    doc.on('isNew', arr.notify('isNew'));
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  }
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  return arr;
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};