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fun-streams/reduce/README.md

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# The reduce operation
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## reduce example
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```java
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import java.util.List;
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import java.util.Optional;
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void main() {
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List<Integer> nums = List.of(1, 2, 3, 4, 5);
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Optional<Integer> res = nums.stream().reduce((a, b) -> a + b);
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res.ifPresent(System.out::println);
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Optional<Integer> res3 = nums.stream().reduce(Integer::sum);
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res3.ifPresent(System.out::println);
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}
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```

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