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Understanding the concept of Metaverse
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 for a destination to which data can be written. An example of that is the fs.createWriteStream method.
- A duplex streams is both Readable and Writable. An example of that is a TCP socket.
- Transform streams are basically a duplex stream that can be used to modify or transform the data as it is written and read.
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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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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 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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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...
Observation as fact
An observation as fact is information that is observed to be true.
Facts are verifable data that we all see and which can be quantifed.
For example, we can verify that a smartphone is rectangular-shaped, broccoli is a source of iron, or that 600,000 people attended an event.
Observation as interpretation
An observation can also be an interpretation, a source of narrative data based on personal beliefs or prior experience.
For example, we believe that broccoli is a healthy food choice, or that we attended the biggest event of the year
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