Java Streams and Lambdas

Process collections declaratively with lambdas and the Stream API (Java 8+).

Intermediate

double avg = readings.stream()
        .filter(v -> v > 0)
        .mapToDouble(Double::doubleValue)
        .average()
        .orElse(0);

List<String> names = components.stream()
        .map(Component::name)
        .sorted()
        .toList();

Streams describe what to compute; they are lazy and can run in parallel with .parallelStream().

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