The peek method is a powerful and often underutilized feature in the Java Stream API. The peek method is introduced to provide a mechanism for debugging and gaining insights into intermediate stages of stream pipelines and offers a window into the transformation of the data facilitating a clear understanding of the flow of elements within the stream.

Basic Syntax

The basic syntax of the peek method involves inserting it into a stream pipeline, typically before a terminal operation. Its usage can be illustrated as follows: