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rnaufal/OptionalPeopleCars.java

Created March 6, 2018 15:07
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OptionalPeopleCars.java
Collection<Car> allPeopleCars = people
.stream()
.map(Person::getCars)
.flatMap(mayHaveCars -> mayHaveCars.map(Collection::stream).orElseGet(Stream::empty))
.collect(Collectors.toList());
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