Node.js fs.Dirent.isFIFO() Method

The fs.Dirent.isFIFO() method is an inbuilt application programming interface of class fs.Dirent within File System module which is used to check if the particular dirent describes a first in first out pipe or not.

Syntax:

const dirent.isFIFO()

Parameter: This method does not accept any parameter.

Return Value: This method returns true if the particular dirent describes a first in first out pipe otherwise false.

Example 1: The below program illustrates the use of fs.dirent.isFIFO() method in Node.js:

Filename: index.js

javascript

// Node.js program to demonstrate the
// dirent.isFIFO() method
const fs = require('fs');

// Initiating async function
async function stop(path) {

    // Creating and initiating FIFO's
    // underlying resource handle
    const dir = await fs.promises.opendir(path);

    // Synchronously reading the FIFO's
    // underlying resource handle
    // using readSync() method
    for (let i = 0; i <= 3; i++) {

        // Checking if the particular dirent is
        // FIFO or not by using isFIFO() method
        const value = (dir.readSync()).isFIFO();

        // Display the result
        console.log(dir.readSync());
        console.log(value);
    }
}

// Catching error
stop('./').catch(console.error);

Run the index.js file using the following command: 

node index.js

Output:

Dirent { name: 'cert.cer', [Symbol(type)]: 1 }
false
Dirent { name: 'certificate1.cer', [Symbol(type)]: 1 }
false
Dirent { name: 'filename.txt', [Symbol(type)]: 1 }
false
Dirent { name: 'GFG.java', [Symbol(type)]: 1 }
false

Example 2: The below program illustrates the use of fs.dirent.isFIFO() method in Node.js:

Filename: index.js

javascript

// Node.js program to demonstrate the
// dirent.isFIFO() method
const fs = require('fs');

// Initiating async function
async function stop(path) {

    let dir = null;

    try {

        // Creating and initiating directory's
        // underlying resource handle
        dir = await fs.promises.opendir(
            new URL('file:///F:/java/'));

        // Synchronously reading the FIFO's
        // underlying resource handle
        // using readSync() method
        for (let i = 0; i <= 3; i++) {

            // Checking if the particular dirent is
            // FIFO or not by using isFIFO() method
            const value = (dir.readSync()).isFIFO();

            // Display the result
            console.log(dir.readSync());
            console.log(value);
        }
    } finally {

        if (dir) {

            // Display the result
            console.log("dir is closed successfully");

            // Synchronously closeSyncing the directory's
            // underlying resource handle
            const promise = dir.closeSync();
        }
    }
}

// Catching error
stop('./').catch(console.error);

Run index.js file using the following command:  

node index.js

Output: 

Dirent { name: 'cert.cer', [Symbol(type)]: 1 }
false
Dirent { name: 'certificate1.cer', [Symbol(type)]: 1 }
false
Dirent { name: 'features', [Symbol(type)]: 2 }
false
Dirent { name: 'GFG.class', [Symbol(type)]: 1 }
false
dir is closed successfully

Reference: https://nodejs.org/dist/latest-v12.x/docs/api/fs.html#fs_dirent_isfifo