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Node.js Stream writable.writableFinished Property

  • Last Updated : 12 Oct, 2021

The writable.writableFinished property is set to true instantly before the emit of the ‘finish’ event.

Syntax:

writable.writableFinished

Return Value: It returns true if ‘finish’ event is called before it else it returns false.
Below examples illustrate the use of writable.writableFinished property in Node.js:

Example 1:




// Node.js program to demonstrate the     
// writable.writableFinished Property
   
// Accessing stream module
const stream = require('stream');
   
// Creating a stream and creating 
// a write function
const writable = new stream.Writable({
   
  // Write function with its 
  // parameters
  write: function(chunk, encoding, next) {
   
    // Converting the chunk of
    // data to string
    console.log(chunk.toString());
    next();
  }
});
    
// Using for loop and calling 
// write method 
for (let i = 0; i < 5; i++) {
  writable.write(`GfG, #${i}!`);
}
   
// Emitting finish event
writable.on('finish', () => {
  console.log('All writes are now complete.');
});
   
// Calling end function
writable.end('This is the end\n');
   
// Calling writable.writableFinished  
// Property
writable.writableFinished;
writable.destroy();

Output:



GfG, #0!
GfG, #1!
GfG, #2!
GfG, #3!
GfG, #4!
This is the end

All writes are now complete.

Example 2:




// Node.js program to demonstrate the     
// writable.writableFinished Property
   
// Accessing stream module
const stream = require('stream');
   
// Creating a stream and creating 
// a write function
const writable = new stream.Writable({
   
  // Write function with its 
  // parameters
  write: function(chunk, encoding, next) {
   
    // Converting the chunk of
    // data to string
    console.log(chunk.toString());
    next();
  }
});
   
// Calling write() method
writable.write('GfG');
   
// Calling writable.writableFinished  
// Property
writable.writableFinished;
writable.destroy();

Output

GfG

In the above example the output is false as ‘finish’ event is not called before writable.writableFinished property.

Reference: https://nodejs.org/api/stream.html#stream_writable_writablefinished.




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