I find the 'exercise for the user' quite confusing since no clear signature for those methods are given and the return type changes between the examples.
Anyway, if anyone is wondering, flatMap is used because getAddress returns an Option<Address> in one of the examples. map is used instead with 'getStreet' because it returns a plain String.
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Good point, thank you. I have added a small extra sentence, that hopefully reduced the confusion.
To add to your answer: flatMap expects a mapper that returns an Option. map on the other hand wraps the result of the applied mapper function into either some or none.
In short: map creates a new "Gift Box" and flatMap reuses the "Gift Box".
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I find the 'exercise for the user' quite confusing since no clear signature for those methods are given and the return type changes between the examples.
Anyway, if anyone is wondering,
flatMapis used becausegetAddressreturns anOption<Address>in one of the examples.mapis used instead with 'getStreet' because it returns a plainString.Good point, thank you. I have added a small extra sentence, that hopefully reduced the confusion.
To add to your answer:
flatMapexpects a mapper that returns anOption.mapon the other hand wraps the result of the applied mapper function into eithersomeornone.In short:
mapcreates a new "Gift Box" andflatMapreuses the "Gift Box".