Checking file existence and stats in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Node.js file system module.

Node.js

const fs = require([1]);

Drag options to blanks, or click blank then click option'

A"os"

B"fs"

C"http"

D"path"

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'path' or 'http' instead of 'fs' in require.

Forgetting to put quotes around the module name.

The fs module is used to work with the file system in Node.js. You import it by requiring the string "fs".

2fill in blank

medium

Complete the code to check if a file exists synchronously.

Node.js

const exists = fs.[1]Sync('example.txt');

Drag options to blanks, or click blank then click option'

AexistsSync

Bexists

CreadFile

Dstat

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'exists' which is deprecated.

Using 'readFile' which reads file content instead of checking existence.

The existsSync method checks if a file exists synchronously and returns true or false.

3fill in blank

hard

Fix the error in the code to get file stats asynchronously.

Node.js

fs.stat('file.txt', ([1], stats) => {
  if (err) {
    console.error(err);
    return;
  }
  console.log(stats.size);
});

Drag options to blanks, or click blank then click option'

AerrorObj

Berror

Cerr

De

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different parameter name than the one checked inside the callback.

Forgetting the error parameter entirely.

The callback function receives an error object as the first argument, commonly named err. The code checks if (err) so the parameter must be named err to match.

4fill in blank

hard

Fill both blanks to create a synchronous check for file stats and print if it is a file.

Node.js

try {
  const stats = fs.[1]('data.json');
  if (stats.[2]()) {
    console.log('It is a file');
  }
} catch (err) {
  console.error('Error:', err);
}

Drag options to blanks, or click blank then click option'

AstatSync

BisFile

CisDirectory

Dstat

Attempts:

3 left

💡 Hint

Common Mistakes

Using asynchronous stat method without callback.

Using isDirectory() instead of isFile() when checking for a file.

statSync gets file stats synchronously. The isFile() method checks if the path is a file.

5fill in blank

hard

Fill all three blanks to read a file asynchronously and log its size in bytes.

Node.js

fs.[1]('log.txt', ([2], data) => {
  if ([3]) {
    console.error([3]);
    return;
  }
  console.log('File size:', data.length);
});

Drag options to blanks, or click blank then click option'

AreadFile

Berr

Dstat

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'stat' instead of 'readFile' to read file content.

Using different names for error parameter inconsistently.

readFile reads the file asynchronously. The first callback parameter is the error, commonly named err. The code checks and logs err if it exists.