Node.js fs.Dirent.isCharacterDevice() Method

Last Updated : 24 Apr, 2023

The fs.Dirent.isCharacterDevice() method is an inbuilt application programming interface of class fs.Dirent within the File System module which is used to check if the particular dirent describes a character device or not.

Syntax: 

const dirent.isCharacterDevice()

Parameter: This method does not accept any parameter.

Return value: This method returns true if the particular dirent describes the character device otherwise false.

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

Filename: index.js  

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

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

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

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

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

        // 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.isCharacterDevice() method in Node.js:

Filename: index.js 

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

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

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

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

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

        // 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: 'adonis_auth_api', [Symbol(type)]: 2 }
false
Dirent { name: 'Android Template', [Symbol(type)]: 2 }
false
Dirent { name: 'Calendar', [Symbol(type)]: 2 }
false
Dirent { name: 'first-app', [Symbol(type)]: 2 }
false

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

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