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'use strict';

var variadic = require('../helpers/variadic');

module.exports = function only() {
  var _this = this;

  for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
    args[_key] = arguments[_key];
  }

  var properties = variadic(args);

  if (Array.isArray(this.items)) {
    var _collection = this.items.filter(function (item) {
      return properties.indexOf(item) !== -1;
    });

    return new this.constructor(_collection);
  }

  var collection = {};

  Object.keys(this.items).forEach(function (prop) {
    if (properties.indexOf(prop) !== -1) {
      collection[prop] = _this.items[prop];
    }
  });

  return new this.constructor(collection);
};