Tag: bluebird

How to check if an object is a Promise?

bluebird es6-promise javascript promise q

Whether it’s an ES6 Promise or a Bluebird Promise, Q Promise, etc. How do I test to see if a given object is a Promise? Answer How a promise library decides If it has a .then function – that’s the only standard promise libraries use. The Promises/A+ specification has a notion called thenable which is basically “an object with a

Aren’t promises just callbacks?

bluebird callback javascript promise q

I’ve been developing JavaScript for a few years and I don’t understand the fuss about promises at all. It seems like all I do is change: Which I could use a library like async for anyway, with something like: Which is more code and less readable. I didn’t gain anything here, it’s not suddenly magically ‘flat’ either. Not to mention