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:
// 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:
// 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