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6.2 Primitive Streams (IntStream) & Numeric Aggregations
Topic Summary
Avoid expensive object autoboxing penalties using IntStream, LongStream, DoubleStream, and custom reducers.
What You Will Learn
• Use `IntStream.rangeClosed()` and `mapToInt()`.
• Eliminate `Integer` wrapper allocation overhead.
• Calculate sum, min, max, and average with built-in statistics.
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