The combiner in the reduce() function is a binary operator that combines two values of type T into a single value of type T. It is used to accumulate the results of the reduction as the reduce() function iterates over the elements of the stream.
The combiner is typically a mathematical function, such as addition, subtraction, multiplication, or division. However, it can also be a more complex function, such as a function that merges two collections or a function that computes the average of two values.
The combiner is a very important part of the reduce() function, as it determines how the elements of the stream are combined to produce the final result of the reduction.
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