The fs.Dirent.isBlockDevice() 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 block device or not.
Syntax:
const dirent.isBlockDevice()
Parameters: This method does not accept any parameter.
Return Value: This method returns true if the particular dirent describes the block device otherwise false.
Example 1: The below program illustrates the use of fs.dirent.isBlockDevice() method in Node.js:
Filename: index.js
// Node program to demonstrate the // dirent.isBlockDevice() 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 blocked device or not by using
// isBlockDevice() method
const value = (dir.readSync()).isBlockDevice();
// Display the result
console.log(dir.readSync());
console.log(value);
}
} // Catching error stop( './' ). catch (console.error);
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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.isBlockDevice() method in Node.js:
Filename: index.js
// dirent.isBlockDevice() 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 blocked device or not
// by using isBlockDevice() method
const value = (dir.readSync())
.isBlockDevice();
// Display the result
console.log(dir.readSync());
console.log(value);
}
} // Catching error stop( './' ). catch (console.error);
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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
Note: The above program will not run on online JavaScript and script editor.
Reference: https://nodejs.org/dist/latest-v12.x/docs/api/fs.html#fs_dirent_isblockdevice