Asynchronous Control Flow Patterns with Streams
Explore how Node.js streams can be used to implement asynchronous control flow patterns that guarantee sequential data processing. Understand how to create stream-based functions to handle asynchronous tasks in order, making code more elegant and efficient for handling file concatenation or similar operations.
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Going through the examples that we’ve presented so far, it should be clear that streams can be useful not only to handle I/O but also as an elegant programming pattern that can be used to process any kind of data. But the advantages don’t end at its simple appearance; streams can also be leveraged to turn “asynchronous control flow” into “flow control,” as we’ll see in this section.
Sequential execution
By default, streams will handle data in sequence. For example, the _transform() function of a Transform stream will never be invoked with the next chunk of data until the previous invocation completes by calling callback(). This is an important property of streams, crucial for processing each chunk in ...