Do I need to create duplex stream to write to and then read from through piping

Asked Oct 24 '16 at 16:40

Active Oct 24 '16 at 16:40

Viewed 285 times

Suppose I have the following code:

var fs = require('fs');
var stream1 = fs.createReadStream('file1.txt');
var stream2 = fs.createWriteStream('file2.txt');
var stream3 = fs.createWriteStream('file3.txt');

This statement stream1.pipe(stream2); returns stream2, which is writable, not readable. But what if I then wanted to pipe it again, like so:

stream1.pipe(stream2).pipe(stream3);

Would I need to create stream2 as duplex? And if so, how?

asked Oct 24 '16 at 16:40

Max Koretskyi

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You can simply do `stream1.pipe(stream2)` and `stream1.pipe(stream3)` just don't use chaining. – Molda Oct 24 '16 at 19:22
@Molda, thanks, but what if I wanted to use chaining? – Max Koretskyi Oct 24 '16 at 19:32
Can you explain what you are actualy trying to achieve and why do you need chaining? Also see this http://stackoverflow.com/a/19561718/3284355 it might help. – Molda Oct 24 '16 at 20:38
I was just trying to understand when I need to use `duplex` streams. It's for learning purposes only. – Max Koretskyi Oct 25 '16 at 16:12

Do I need to create duplex stream to write to and then read from through piping

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