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we have a problem with promise

Q: What is the difference between these four promises?

doSomething()
.then(function () {
  return doSomethingElse();
});

doSomething()
.then(function () {
  doSomethingElse();
});

doSomething()
.then(doSomethingElse());

doSomething()
.then(doSomethingElse);

PouchDB

https://github.com/pouchdb/pouchdb

https://pouchdb.com/

var db = new PouchDB('dbname');

db.put({
  _id: 'dave@gmail.com',
  name: 'David',
  age: 69
});

db.changes().on('change', function() {
  console.log('Ch-Ch-Changes');
});

db.replicate.to('http://example.com/mydb');

CouchDB

Apache CouchDB™

https://couchdb.apache.org/

https://github.com/apache/couchdb

无缝的多主机同步 从大数据扩展到移动， 使用直观的HTTP / JSON API 为可靠性而设计。

refs

https://pouchdb.com/2015/05/18/we-have-a-problem-with-promises.html

https://gist.github.com/nolanlawson/6ce81186421d2fa109a4

https://fex.baidu.com/blog/2015/07/we-have-a-problem-with-promises/

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