Mutable Reduction Through reduce()
Explore how to perform mutable reduction operations in Java 8 using the Stream API. Understand different reduce() methods, accumulation functions, and combiners to aggregate stream data efficiently, including examples for summing and finding max or min values.
Introduction to reduction operations
Reduction stream operations are those operations that reduce the stream into a single value. The operations that we are going to discuss in this lesson are immutable operations because they reduce the result into a single-valued immutable variable. Given a collection of objects, we may need to get the sum of all the elements, the max element, or any other operation which gives us a single value as a result. This can be achieved through reduction operations.
Before we discuss all the reduction operations in detail, let’s first look at some key concepts of reduction:
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Identity – an element that is the initial value of the reduction operation and the default result if the stream is empty.
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Accumulator – a function that takes two parameters: a ...