The spirit of the idea is to be explicit about what is the behavior you can expect from the code. You can’t foresee every exception, but you can at least make a

The spirit of the idea is to be explicit about what is the behavior you can expect from the code. You can’t foresee every exception, but you can at least make an effort to handle those that are likely to happen. It allows the calling code to handle the exception in a way that it doesn’t kill the program unless necessary. You can recover from some exceptions and should if possible. Note that it took me a bit of getting used to the idea due to my background with python. Its type system does require a lot of extra code to implement this pattern.