text: 
  
  /** Used as references for various `Number` constants. */
  const NAN = 0 / 0
  
  /**
   * This method is like `mean` except that it accepts `iteratee` which is
   * invoked for each element in `array` to generate the value to be averaged.
   * The iteratee is invoked with one argument: (value).
   *
   * @since 4.7.0
   * @category Math
   * @param {Array} array The array to iterate over.
   * @param {Function} iteratee The iteratee invoked per element.
   * @returns {number} Returns the mean.
   * @example
   *
   * const objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }]
   *
   * meanBy(objects, ({ n }) => n)
   * // => 5
   */
  function meanBy(array, iteratee) {
    const length = array == null ? 0 : array.length
    return length ? (baseSum(array, iteratee) / length) : NAN
  }
  
  
  