Section 17.3.3 Terminal Operation reduce
• You can define your own reductions for an IntStream by calling its reduce method. The first argument is a value that helps you begin the reduction operation and the second argument is an object that implements the IntBinaryOperator (p. 740) functional interface.
• Method reduce’s first argument is formally called an identity value (p. 740)—a value that, when combined with any stream element using the IntBinaryOperator produces that element’s original value.
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