The readable.resume() method in a Readable Stream is used to paused data that can be resumed again and data starts flowing again.
Syntax:
readable.resume()
Parameters: This method doesn’t accept any parameters.
Return Value: If this method is used then the data that was paused, starts flowing again.
Below examples illustrate the use of readable.resume() method in Node.js:
Example 1:
// Node.js program to demonstrate the // readable.resume() method // Including fs module const fs = require( 'fs' );
// Constructing readable stream const readable = fs.createReadStream( "input.text" );
readable.on( 'data' , (chunk) => {
console.log(`${chunk}`);
}); // Calling pause method readable.pause(); // Calling resume method readable.resume(); console.log( "Data starts flowing again!!" );
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Output:
Data starts flowing again!! Hello!!!
Example 2:
// Node.js program to demonstrate the // readable.resume() method // Include fs module const fs = require( 'fs' );
// Create readable stream const readable = fs.createReadStream( "input.text" );
// Handling data event readable.on( 'data' , (chunk) => {
console.log(`${chunk}`);
// Calling pause method
readable.pause();
// After this any data will be displayed
// after 3 sec.
console.log( 'No additional data will be '
+ 'displayed for 3 seconds.' );
// Using setTimeout function
setTimeout(() => {
console.log( 'Now data starts flowing again.' );
// Calling resume method
readable.resume();
}, 3000);
}); // Displays that program // is ended console.log( "Program ends!!" );
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Output:
Program ends!! Hello!!! No additional data will be displayed for 3 seconds. Now data starts flowing again.
However, you can see while running, that after the execution of pause() method, no further data will be displayed for 3 seconds.
Reference: https://nodejs.org/api/stream.html#stream_readable_resume