code: function baseFill(array, value, start, end) {
        var length = array.length;
  
        start = toInteger(start);
        if (start < 0) {
          start = -start > length ? 0 : (length + start);
        }
        end = (end === undefined || end > length) ? length : toInteger(end);
        if (end < 0) {
          end += length;
        }
        end = start > end ? 0 : toLength(end);
        while (start < end) {
          array[start++] = value;
        }
        return array;
      }
docs: The base implementation of `_.fill` without an iteratee call guard.
  
  @private
  @param {Array} array The array to fill.
  @param {*} value The value to fill `array` with.
  @param {number} [start=0] The start position.
  @param {number} [end=array.length] The end position.
  @returns {Array} Returns `array`.