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by mseebach 4807 days ago
No, I didn't misunderstand. 'Nothing' and 0 are not interchangeable.
2 comments
fusiongyro 4807 days ago
You did misunderstand: you took a friendly illustration of an alternative way to use Maybe as some kind of absolutist degree. Well, put down your sword. Much of the time when you have Maybe you also have a sensible default value and you want to use that rather than live the rest of your life inside Maybe. fromMaybe is just a handy way to deal with that case.
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mercurial 4806 days ago
> No, I didn't misunderstand. 'Nothing' and 0 are not interchangeable.

Nobody said they were. That's idiomatic Haskell for something like this in Java when unboxing Integers:

  return (a != null ? a : 0) + (b != null ? b : 0);
As you can see, there is no adding Nothing to integers.
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