Node.js Stream readable.readable Property

The readable.readable property is an inbuilt application programming interface of Stream module which is used to check if it is safe to call readable.read() method.

Syntax:

readable.readable

Return Value: It returns true if readable.read() method is being called otherwise returns false.

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

Example 1:

// Node.js program to demonstrate the
// readable.readable Property

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

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

// Calling readable property
readable.readable;

Output:

true

Example 2:

// Node.js program to demonstrate the
// readable.readable Property

// Include fs module
const fs = require("fs");

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

// Instructions for reading data
readable.on('readable', () => {
  let chunk;

  // Using while loop and calling
  // read method
  while (null !== (chunk = readable.read())) {

    // Displaying the chunk
    console.log(`read: ${chunk}`);
  }
});

// Shows that the program
// ended
console.log("Program ends!!");

// Calling readable property
readable.readable;

Output:

Program ends!!
true
read: hello

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