Node.js Stream writable.destroyed Property

The writable.destroyed property is an inbuilt application programming interface of Stream module which is used to check the writable.destroy() method is being called or not. Syntax:

writable.destroyed

Return Value: This property returns true if writable.destroy() method is called before it else it returns false. Below examples illustrate the use of writable.destroyed property in Node.js: Example 1:

javascript

// Node.js program to demonstrate the     
// writable.distroyed 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();
  }
});

// Writing data
writable.write('hi');

// Again writing some data
writable.write('hello');

// Calling destroy function
writable.destroy();

// Calling the Property
writable.destroyed;

Output:

hi
hello
true

Example 2:

javascript

// Node.js program to demonstrate the     
// writable.distroyed 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();
  }
});

// Writing data
writable.write('hi');

// Again writing some data
writable.write('hello');

// Calling the Property
writable.destroyed;

Output:

hi
hello
false

In the above example the output is false as writable.destroy() method is not called before calling the property writable.destroyed. Reference: https://nodejs.org/api/stream.html#stream_writable_destroyed

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