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Node.js | Stream writable.writableLength Property
  • Last Updated : 25 Feb, 2020

The writable.writableLength property is an inbuilt application of stream module which is used to check the number of bytes in the queue that is ready to be written.

Syntax:

writable.writableLength

Return Value: This property returns the number of bytes that is ready to write into the queue.

Below examples illustrate the use of writable.writableLength property in Node.js:

Example 1:






// Node.js program to demonstrate the     
// writable.writableLength 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 cork() function
writable.cork();
  
 //Writing data
writable.write('hi');
  
// Again writing some data
writable.write('GFG');
  
// Calling writable.writableLength 
// Property
writable.writableLength;

Output:

5

Example 2:




// Node.js program to demonstrate the     
// writable.writableLength 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 cork() function
writable.cork();
  
 //Writing data
writable.write('hi');
  
// Calling uncork() function
writable.uncork();
  
// Again calling cork function
writable.cork();
  
// Again writing some data
writable.write('GFG');
  
// Calling writable.writableLength 
// Property
writable.writableLength;

Output:

hi
3

Here, the data ‘hi’ is not present in buffer anymore So, the buffer has only 3 bytes present data ‘GFG’ takes 3 bytes.

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

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