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<\/a><\/p>\nUtil Module<\/h3>\n
The util module is a core module in Node.js that offers a variety of utility functions for debugging, formatting, and working with objects. Let’s see a few common use cases:<\/p>\n
a) Inheriting Objects:<\/strong> The \u2018util.inherits\u2019 function allows you to create object inheritance in Node.js. It sets up the prototype chain between two constructors, enabling prototype-based inheritance.<\/p>\n Output:<\/strong><\/p>\n Hello, I am the parent.<\/p>\n b) Promisify:<\/strong> The \u2018util.promisify\u2019 function is used to convert callback-based functions into Promise-based functions, simplifying asynchronous operations. Here’s an example:<\/p>\n Output:<\/strong><\/p>\n Hello, World!<\/p>\n Hence the file.txt contains Hello, World!<\/p>\n The path module offers tools for navigating between files and directories. It helps in handling cross-platform path compatibility and resolving file paths correctly. Consider the following examples:<\/p>\n a) Resolving Paths:<\/strong> The ‘path.resolve’ method resolves a series of routes or path segments into an absolute path.<\/p>\n Output:<\/strong><\/p>\n The crypto module provides cryptographic functionalities, such as generating secure hashes, encrypting and decrypting data, and creating digital signatures. Let’s see an example of generating an MD5 hash:<\/p>\n The OS module provides a set of utility methods for interacting with the operating system. It allows developers to retrieve information about the operating system, and network interfaces, and perform certain system-related operations. Here are a few notable use cases:<\/p>\n a) Retrieving Operating System Information:<\/strong><\/p>\n The OS module provides functions to retrieve information about the operating system, such as the platform, hostname, and architecture.<\/p>\nconst util = require('util');\n \nfunction Parent() {}\nParent.prototype.greet = function() {\n console.log('Hello, I am the parent.');\n}\n \nfunction Child() {}\nutil.inherits(Child, Parent);\n \nconst childObj = new Child();\nchildObj.greet(); \/\/ Output: Hello, I am the parent.\n<\/pre>\nconst util = require('util');\nconst fs = require('fs');\n \nconst readFileAsync = util.promisify(fs.readFile);\n \nreadFileAsync('file.txt', 'utf8')\n .then(data => console.log(data))\n .catch(err => console.error(err));\n<\/pre>\nPath Module<\/h4>\n
\/\/ Require path\nconst path = require('path');\n \n\/\/ Display Resolve\nconsole.log('resolve:' + path.resolve('paths.js'));\n \n\/\/ Display Extension\nconsole.log('extension:' + path.extname('paths.js'));\n<\/pre>\n<\/a><\/p>\nconst path = require('path');\n \nconst filePath = '\/path\/to\/file.txt';\nconst fileInfo = path.parse(filePath);\n \nconsole.log(fileInfo);\n\/* Output:\n{\n root: '\/',\n dir: '\/path\/to',\n base: 'file.txt',\n ext: '.txt',\n name: 'file'\n}\n*\/\n<\/pre>\nCrypto Module<\/h4>\n
const crypto = require('crypto');\n \nconst data = 'Hello, World!';\nconst hash = crypto.createHash('md5').update(data).digest('hex');\n \nconsole.log(hash); \/\/ Output: 6cd3556deb0da54bca060b4c39479839\n<\/pre>\nOS Module<\/h4>\n
\/\/ Require operating System module\nconst os = require(\"os\");\n \n\/\/ Display operating System type\nconsole.log('Operating System type : ' + os.type());\n \n\/\/ Display operating System platform\nconsole.log('platform : ' + os.platform());\n \n\/\/ Display total memory\nconsole.log('total memory : ' + os.totalmem() + \" bytes.\");\n \n\/\/ Display available memory\nconsole.log('Available memory : ' + os.availmem() + \" bytes.\");\n<\/pre>\n