Promises can be both a blessing and a curse. They were supposed to clean the “callback pyramid of doom”, but instead they can often end up confusing (and I wanted to call that “The callback Temple of Doom”. It doesn’t really make sense in this context, I just like Indiana Jones)
While promises do help, they are a lot more complicated than plain callbacks. With callbacks, you just pass a function and maybe stick another function inside that. But with promises, there’s a lot more.
The chaining can be confusing, as exceptions, normal JS values and promises all affect it differently. Setting more complex flows can also be difficult, as you need to juggle multiple promises and their result values around.
Then there’s the whole topic of error handling. The default behavior with promises is super convenient: Unhandled errors are silently ignored, because apparently the person behind promises hates everyone and wants you to have extra fun debugging times.
This means the better you know the ins and outs of promises, the better prepared you are for the future – not to mention that promises are very convenient when used well, despite the complexities.
Because of the importance of this, and the questions I sometimes receive which relate to promises, I’ve put together a list of the best promise-related material for you!
Below you’ll find a ton of info on promises, from the basics to super in-depth!