const getPropByPath1 = (object, path, defaultVal) => {
  const _path = Array.isArray(path)
    ? path
    : path.split('.');

  if (!_path.length) {
    return object === undefined ? defaultVal : object
  }

  return getPropByPath1(object[_path.shift()], _path, defaultVal)
}

const getPropByPath2 = (obj, path, defaultValue) => {
  const travel = regexp =>
    String.prototype.split
      .call(path, regexp)
      .filter(Boolean)
      .reduce((res, key) => (res !== null && res !== undefined ? res[key] : res), obj);
  const result = travel(/[,[\]]+?/) || travel(/[,[\].]+?/);
  return result === undefined || result === obj ? defaultValue : result;
};


const getPropByPath3 = (object, path, defaultValue) => {
    const _path = Array.isArray(path)
    	? path
    	: path.split('.');
    if (object && _path.length) return getPropByPath3(object[_path.shift()], _path, defaultValue);
    return object === undefined ? defaultValue : object;
};


const obj = {
	mobile: {
            aside: true,
            isTitle: true,
        },
    };
    
const path = 'mobile.isTitle.foo.bar';
const def = 'foo';