whole_func_string: function pad (n, length) {
                      return libs.string.pad(n.toString(), length, '0', true);
                  }
func_code_string: function pad (n, length) {
                      return libs.string.pad(n.toString(), length, '0', true);
                  }
func_documentation_string: Pads a number with preceeding zeros.
  @param {Number} n The number object to operate on.
  @param {Number} length The final length of the string
  @returns {String} The padded number, now a string.
  @function