code: function baseIndexOfWith(array, value, fromIndex, comparator) {
      var index = fromIndex - 1,
          length = array.length;
  
      while (++index < length) {
        if (comparator(array[index], value)) {
          return index;
        }
      }
      return -1;
    }
docs: This function is like `baseIndexOf` except that it accepts a comparator.
  
  @private
  @param {Array} array The array to inspect.
  @param {*} value The value to search for.
  @param {number} fromIndex The index to search from.
  @param {Function} comparator The comparator invoked per element.
  @returns {number} Returns the index of the matched value, else `-1`.