Paused and Flowing Modes of Readable Streams - Deepstash
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Paused and Flowing Modes of Readable Streams

Readable streams have two main modes that affect the way we can consume them: 

  • They can be either in the paused mode 
  • Or in the flowing mode.

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Implementing Duplex/Transform Streams

The readable and Writable sides of a duplex stream operate completely independently from one another. A transform stream is the more interesting duplex stream because its output is computed from its input. 

For a transform stream, we don’t have to implement the read or write methods, we onl...

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Stream events

The most important events on a readable stream are:

  • The data event, which is emitted whenever the stream passes a chunk of data to the consumer
  • The end event, which is emitted when there is no more data to be consumed from the stream.

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What exactly are streams?

Streams are collections of data — just like arrays or strings. The difference is that streams might not be available all at once, and they don’t have to fit in memory. This makes streams really powerful when working with large amounts of data, or data that’s coming from an external source one

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Streams 101

There are four fundamental stream types in Node.js: Readable, Writable, Duplex, and Transform streams.

  • A readable stream is an abstraction for a source from which data can be consumed. An example of that is the fs.createReadStream method.
  • A writable stream is an abstraction f...

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Implementing a Writable Stream

This write method takes three arguments.

  • The chunk is usually a buffer unless we configure the stream differently.
  • The encoding argument is needed in that case, but usually we can ignore it.
  • To signal a failure, call the Callback with an error object.

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Implementing Streams

When we talk about streams in Node.js, there are two main different tasks:

  • The task of implementing the streams.
  • The task of consuming them.

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isaactu

Telecommunications researcher

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