refactor

[ETBlue]

https://www.facebook.com/photo.php?fbid=10209660977533938&set=a.10209533675351463.1073741859.1014354995&type=3&theater

• ES6 shorthand property names
  const { id, article_id } = params;
  // 或是在參數部分 ({ id, article_id }) =>
  const law = {
  勞動基準法,
  勞資爭議處理法,
  大量解僱勞工保護法,
  工會法,
  船員法,
  高級xxxx,
  }
• guard / default operators http://seanmonstar.com/post/707078771/guard-and-default-operators
  const lawData = id && law[id];
• guard statement http://there4.io/2015/06/10/refactoring-with-guard-clauses-php-javascript/
  if(!id || law[Id] == null){ return false; }
  先擋掉內文就少一個階層了。