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Node.js Readable Stream resume Event

Last Updated : 12 Oct, 2021
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The 'resume' Event in a Readable Stream is emitted when stream.resume() is being called and readableFlowing property is not true. Syntax: 
Event: 'resume'
Return Value: It is emitted if readable.resume() is being called else it is not emitted. Below examples illustrate the use of resume event in Node.js: Example 1: javascript 
// Node.js program to demonstrate the     
// readable resume event

// Including fs module
const fs = require('fs');

// Constructing readable stream
const readable = fs.createReadStream("input.txt");

// Handling data event
readable.on('data', (chunk) => {
  console.log(`${chunk}`);
});

// Calling pause method
 readable.pause() 

 // Calling resume method
 readable.resume();

 // Handling resume event
 readable.on('resume', () => {
    console.log("resume emitted!");
});

console.log("Program ends....");
Output: 
Program ends....
resume emitted!
GeeksforGeeks
Example 2: javascript 
// Node.js program to demonstrate the     
// readable resume event

// Including fs module
const fs = require('fs');

// Constructing readable stream
const readable = fs.createReadStream("input.txt");

// 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();

    // Emitting resume event
    readable.on("resume", () => {
    console.log("resume emitted!");
});
  }, 3000);
});

console.log("Done....");
Output: 
Done....
GeeksforGeeks
No additional data will be displayed for 3 seconds.
Now data starts flowing again.
resume emitted!
Reference: https://nodejs.org/api/stream.html#stream_event_resume

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nidhi1352singh
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