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Exercise: A Virtual Filesystem

Explore how to implement a virtual filesystem in Node.js by modifying a filesystem adapter to store data in memory. Understand how to write and read files using caching techniques, manage asynchronous operations with promises, and handle errors effectively within a structural design pattern context.

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Problem statement

Modify our LevelDB filesystem adapter example to write the file data in memory rather than in LevelDB. You can use an object or a Map instance to store the key-value pairs of filenames and the associated data.

Coding challenge

Write your solution code in the following code widget. We’ve already added the package.json file for your ease.

Node.js
{
  "name": "Chapter-08",
  "version": "1.0.0",
  "description": "This examples shows how to use the adapter pattern to build an FS-like interface that writes to level db instead",
  "main": "index.js",
  "type": "module",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "level": "^6.0.0"
  },
  "engines": {
    "node": ">=14"
  },
  "engineStrict": true
}

Solution

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