code: function multiFieldSort(array, sortBy) {
  	array.sort((a, b) => {
  		for (let field of sortBy) {
  			let reverse = field[0] === '-';
  			if (reverse) {
  				field = field.slice(1);
  			}
  			let valueA = getPath(a, field);
  			let valueB = getPath(b, field);
  			if (reverse) {
  				if (valueA > valueB) return -1;
  				else if (valueA < valueB) return 1;
  			} else {
  				if (valueA > valueB) return 1;
  				else if (valueA < valueB) return -1;
  			}
  		}
  		return 0;
  	});
  	return array;
  }
docs: This function sorts an array by multiple fields.
  
  @method multiFieldSort
  @param {Object[]} array - Array of objects to sort
  @param {String[]} sortBy - Array of field names (optionally prefixed with '-')
  @return {Object[]} - The input array.  It is also sorted in-place.