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Using Optional as a value in a Map will lead you to unnecessary complexity and confusion — as you can see. The primary intention of Optional is to serve as a return type, indicating that a value m...
Answer
#1: Initial revision
by
ɯıpɐʌ
·
2024-09-11T18:00:24Z (3 months ago)
Using `Optional` as a value in a `Map` will lead you to unnecessary complexity and confusion — as you can see.
The primary intention of `Optional` is to serve as a return type, indicating that a value may or may not be present.
To achieve what you are looking for, you need to _unwrap_ the values:
```java
final var result = input.entrySet()
.stream()
.filter(it -> it.getValue().isPresent())
.collect(Collectors.toMap(Map.Entry::getKey, entry -> entry.getValue().get()));
```