We have a problem with promises

Q: What is the difference between these four promises?
doSomething().then(function () {
  return doSomethingElse();
});

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

doSomething().then(doSomethingElse());

doSomething().then(doSomethingElse);


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If you know the answer, then congratulations: you're a promises ninja. You have my permission to stop reading this blog post.</blockquote>
<a href="http://pouchdb.com/2015/05/18/we-have-a-problem-with-promises.html">http://pouchdb.com/2015/05/18/we-have-a-problem-with-promises.html</a>

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