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name : wrapperAt.js
 var LazyWrapper = require('./_LazyWrapper'),
    LodashWrapper = require('./_LodashWrapper'),
    baseAt = require('./_baseAt'),
    flatRest = require('./_flatRest'),
    isIndex = require('./_isIndex'),
    thru = require('./thru');

/**
 * This method is the wrapper version of `_.at`.
 *
 * @name at
 * @memberOf _
 * @since 1.0.0
 * @category Seq
 * @param {...(string|string[])} [paths] The property paths to pick.
 * @returns {Object} Returns the new `lodash` wrapper instance.
 * @example
 *
 * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
 *
 * _(object).at(['a[0].b.c', 'a[1]']).value();
 * // => [3, 4]
 */
var wrapperAt = flatRest(function(paths) {
  var length = paths.length,
      start = length ? paths[0] : 0,
      value = this.__wrapped__,
      interceptor = function(object) { return baseAt(object, paths); };

  if (length > 1 || this.__actions__.length ||
      !(value instanceof LazyWrapper) || !isIndex(start)) {
    return this.thru(interceptor);
  }
  value = value.slice(start, +start + (length ? 1 : 0));
  value.__actions__.push({
    'func': thru,
    'args': [interceptor],
    'thisArg': undefined
  });
  return new LodashWrapper(value, this.__chain__).thru(function(array) {
    if (length && !array.length) {
      array.push(undefined);
    }
    return array;
  });
});

module.exports = wrapperAt;
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