Async 모듈 사용전 도서 검색 코드

withoutAsync.js

checkPointLimit = booklist.length;
 
appendBookId(booklist, body);
 
_.each(booklist, function(book, key) {
  var o = _.clone(opt);
  o.bookId = book.bookId;
  var index = key;
 
  searchDetail(o, function (err, exist) {
    checkPoint = checkPoint + 1;
    if (err) {
      exist = false;
    }
    booklist[index].exist = exist;
    if (checkPoint === checkPointLimit) {
      if (getBook) {
        getBook(null, {
          startPage: opt.startPage,
          totalBookCount: totalBookCount,
          booklist: booklist
        });
      }
    }
  });
});