The reduce() function in Java is a terminal operation on streams that combines all the elements of the stream into a single value. It does this by applying a binary operator to each element in the stream, where the first argument to the operator is the return value of the previous application and the second argument is the current stream element.
Reduce functions takes
Identity: The initial value of the reduction. This is the value that will be returned if the stream is empty.
Accumulator: A binary operator that combines two values of type T into a single value of type T.
Combiner: 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 reduce() function works by first applying the accumulator to the identity value and the first element in the stream. It then applies the accumulator to the result of the previous application, the next element in the stream, and so on. This process continues until all the elements in the stream have been processed. The final result of the reduction is the return value of the last application of the accumulator.
The reduce() function is a very powerful tool for combining and aggregating data in streams. It can be used to perform a variety of tasks, such as:
Summing the elements of a stream
Finding the maximum or minimum element in a stream
Counting the elements in a stream
Computing the average of the elements in a stream
Creating a new collection from the elements of a stream
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