code: function getChild(path, sep) {
      if (!is.nonEmptyStr(path))  return false;
      if (!is.nonEmptyStr(sep))  sep = defaultSepChar;
  
      // create new path and remove leading and trailing sep chars
      var pathParts = filter(path.split(sep), function(elem) {
          return is.str(elem) && elem.length;
      });
  
      var child = pathParts.length === 0 ? false : pathParts[pathParts.length-1];
      return child;
  }
docs: Given a char separated object path, return the child element (last part) of
  the path. For the path, '1.2.3.4', the child path would be '4'.
  @param {String} path The path for which which we want the child.
  @param {String} sep The separator character to separate path elements in the string path.
  @return {String|Boolean} Child element of the input path parameter or false is there is no child element.