Node.js Readable Stream data Event
The ‘data’ Event in a Readable Stream is emitted when readable.pipe() and readable.resume() method is called for switching the stream into the flowing mode or by adding a listener callback to the data event. This event can also be emitted by calling readable.read() method and returning the chunk of data available.
Syntax:
Event: 'data'
Below examples illustrate the use of data event in Node.js:
Example 1:
const fs = require( 'fs' );
const readable = fs.createReadStream( "input.txt" );
readable.on( 'readable' , () => {
let chunk;
while ( null !== (chunk = readable.read())) {
console.log(`read: ${chunk}`);
}
});
readable.on( 'data' , (chunk) => {
console.log(`chunk length is: ${chunk.length}`);
});
console.log( "Done..." );
|
Output:
Done...
chunk length is: 13
read: GeeksforGeeks
Example 2:
const fs = require( 'fs' );
const readable = fs.createReadStream( "input.txt" );
readable.pause();
readable.on( 'data' , (chunk) => {
console.log(`chunk length is: ${chunk.length}`);
});
console.log( "Done..." );
|
Output:
Done...
Reference: https://nodejs.org/api/stream.html#stream_event_data.
Last Updated :
12 Oct, 2021
Like Article
Save Article
Share your thoughts in the comments
Please Login to comment...