Скачать или смотреть How to Stream Input from Console Using readline in Node.js

Learn how to efficiently stream console input into an array in Node.js using the `readline` module. Discover practical solutions to common inputs challenges.
---
This video is based on the question https://stackoverflow.com/q/75642620/ asked by the user 'Warface2009' ( https://stackoverflow.com/u/21333027/ ) and on the answer https://stackoverflow.com/a/75642823/ provided by the user 'Heiko Theißen' ( https://stackoverflow.com/u/16462950/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Is it possible to stream input from the console using readline? (Node.js, JS)

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Streaming Input from Console Using readline in Node.js

When working with console input in Node.js, a common challenge developers face is how to capture user input in a single line instead of the default line-by-line input. This can lead to a frustrating experience if you aim to collect multiple values efficiently.

In this guide, we will explore a solution for streaming input from the console using the readline module in Node.js. Specifically, you'll learn how to enable users to enter multiple values in one line, separated by spaces.

The Problem: Line-by-Line Input

Let's say you have a requirement for users to enter several values, say, 5 values into an array. You might start with the following code:

[[See Video to Reveal this Text or Code Snippet]]

When you run this code, the output will look something like this:

[[See Video to Reveal this Text or Code Snippet]]

This shows that the input is captured line by line, which is not in line with the desired output format:

[[See Video to Reveal this Text or Code Snippet]]

The Solution: Transforming Input Stream

The key to solving this problem is to transform the input stream so that it recognizes spaces instead of newlines as input delimiters. We will achieve this using a Transform stream.

Here’s how to modify the initial approach:

Step 1: Create a Transform Stream

Using the stream.Transform class, we can process chunks of input and allow for space-separated values, rather than line-separated:

[[See Video to Reveal this Text or Code Snippet]]

Here, we create a new Transform stream that buffers input and processes it by looking for spaces as delimiters.

Step 2: Implement the Input Handling

Next, we can set up our console input to utilize this new transform stream:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Implementation

Input Pipelines: The process.stdin.pipe(input) line connects standard input (where the user types) with our transform stream, allowing us to capture input as it comes in.

For Await Loop: The for await loop processes each space-separated value in the input stream. It continues until we reach our quota of 5 values.

Flexible Input Handling: By modifying how we handle the incoming data, users can seamlessly enter multiple values in one go, improving the overall user experience.

Conclusion

By using the readline and stream modules in Node.js, we can handle user input effectively and flexibly. With these methods, developers can improve data entry interfaces and handle inputs in a more user-friendly manner.

Feel free to experiment with this code, and see how you can adapt it to fit your needs! Happy coding!