When you execute the above code in a Node.js application, it will print the absolute path of the current module file, including the filename. For example:<\/p>\n The \u2018__filename\u2019 global object is particularly useful when you want to access the file path or extract information about the current module being executed. It allows you to dynamically reference the current file within your code.<\/p>\n Here’s a practical example that demonstrates the usage of \u2018__filename\u2019:<\/strong><\/p>\n In Node.js, the \u2018__dirname\u2019 global object represents the directory name of the current module file. It provides the absolute path of the directory containing the currently executing script. In this section, we will explore the usage of the \u2019 __dirname\u2019 global object with a code example.<\/p>\n When you execute the above code in a Node.js application, it will print the absolute path of the directory containing the current module file. For example:<\/p>\n The \u2018__dirname\u2019 global object is useful when you want to access the directory path or resolve file paths relative to the current module.<\/p>\n Here’s a practical example that demonstrates the usage of \u2018__dirname\u2019:<\/strong><\/p>\n The \u2018global\u2019 object is the root object of the Node.js runtime environment. It provides properties and methods that are available globally in your application. While using global objects is generally discouraged due to potential naming conflicts, understanding their capabilities is crucial. Here’s an example:<\/p>\n The \u2018console\u2019 object provides methods for writing output to the console, which is useful for debugging and logging messages. Here’s an example of how to use it:<\/p>\n The \u2018process\u2019 object provides information and controls over the current Node.js process. It contains properties and methods that allow you to interact with the environment, access command-line arguments, and more. Here’s an example:<\/p>\n The \u2018module\u2019 object represents the current module in Node.js. It contains information about the current module, such as its filename, exports, and more. Let’s see an example:<\/p>\n Although not a global object itself, the \u2018require\u2019 function is a fundamental part of Node.js. It allows you to load external modules and their functionality into your application. Here’s a basic usage example:<\/p>\n It’s worth noting that the global objects mentioned above are just a subset of what Node.js offers. There are additional global objects and functions available that serve specific purposes, such as \u2018setTimeout\u2019, \u2018setInterval\u2019, \u2018clearTimeout\u2019, \u2018clearInterval\u2019, and more.<\/p>\n The \u2018setTimeout()\u2019 function allows you to execute a specified function after a specified delay in milliseconds. Here’s an example:<\/p>\n In the above example, the \u2018setTimeout()\u2019 function calls the provided function after a delay of 2 seconds.<\/p>\n The’setInterval()’ function enables you to periodically call a certain function after a given milliseconds-long delay. Here’s an example:<\/p>\n The \u2018clearTimeout()\u2019 function is used to stop the execution of a function that was scheduled to run after a specified delay using \u2018setTimeout()\u2019. Here’s an example:<\/p>\n In the above example, the \u2018setTimeout()\u2019 function calls the provided function after a delay of 2 seconds. The \u2018clearTimeout()\u2019 function is then used to stop the execution of the function.<\/p>\n The \u2018clearInterval()\u2019 function is used to stop the execution of a function that was scheduled to run repeatedly using \u2018setInterval()\u2019. Here’s an example:<\/p>\n In the above example, the \u2018setInterval()\u2019 function calls the provided function repeatedly after a delay of 1 second. The \u2018clearInterval()\u2019 function is then used to stop the execution of the function.<\/p>\n While global objects provide convenience, it’s generally recommended to limit their usage and opt for modular code. Excessive reliance on global objects can lead to potential conflicts and make your code harder to maintain and test.<\/p>\n The TextEncoder class is used to encode JavaScript strings into a specified character encoding. It provides the encode() method to convert a string into an encoded Uint8Array<\/p>\n![\"filename\"](\"https:\/\/techvidvan.com\/tutorials\/wp-content\/uploads\/sites\/2\/2023\/08\/filename-2.webp\")
<\/a><\/p>\n\/home\/user\/project\/app.js\n<\/pre>\n
const path = require('path');\n \nconsole.log(`The current script is located at: ${__filename}`);\n \nconst directory = path.dirname(__filename);\nconsole.log(`The current script is in the directory: ${directory}`);\n<\/pre>\n__dirname:<\/h4>\n
console.log(__dirname);\n<\/pre>\n
<\/a><\/p>\n\/home\/user\/project\/\n<\/pre>\n
const path = require('path');\n \nconsole.log(`The current script is located in the directory: ${__dirname}`);\n \nconst filePath = path.join(__dirname, 'data', 'file.txt');\nconsole.log(`The absolute path to file.txt is: ${filePath}`);\n<\/pre>\nGlobal Objects:<\/h3>\n
\/\/ Accessing global object properties\nconsole.log(global.process); \/\/ Access the 'process' object\n \n\/\/ Modifying global object properties\nglobal.myVariable = 'Hello, Global!';\nconsole.log(myVariable); \/\/ Hello, Global!\n<\/pre>\n
Console Objects:<\/h3>\n
\/\/ Logging messages to the console\nconsole.log('This is a log message');\nconsole.error('This is an error message');\nconsole.warn('This is a warning message');\n<\/pre>\nProcess Objects:<\/h3>\n
\/\/ Accessing process-related information\nconsole.log(process.pid); \/\/ Process ID\nconsole.log(process.cwd()); \/\/ Current working directory\nconsole.log(process.argv); \/\/ Command-line arguments\n<\/pre>\n
Module Objects:<\/h3>\n
\/\/ Accessing module-related information\nconsole.log(module.filename); \/\/ File name of the current module\nconsole.log(module.exports); \/\/ Exported objects and functions\n<\/pre>\n
Require Function:<\/h3>\n
\/\/ Loading a module using 'require'\nconst fs = require('fs'); \/\/ Load the 'fs' module for file system operations\nfs.readFile('example.txt', 'utf8', (err, data) => {\n if (err) throw err;\n console.log(data);\n});\n<\/pre>\n1. setTimeout FUNCTION:<\/h4>\n
\/\/ Call a function after a delay of 2 seconds\nsetTimeout(() => {\n console.log('2 seconds have passed');\n}, 2000);\n<\/pre>\n2. setInterval FUNCTION:<\/h4>\n
\/\/\u00a0Call\u00a0a\u00a0function\u00a0repeatedly\u00a0after\u00a0a\u00a0delay\u00a0of\u00a01\u00a0second\nconst intervalId = setInterval(() => {\n console.log('1 second has passed');\n}, 1000);\n<\/pre>\n3. clearTimeout FUNCTION:<\/h4>\n
\/\/ Call a function after a delay of 2 seconds and then stop it using clearTimeout()\nconst timeoutId = setTimeout(() => {\n console.log('2 seconds have passed');\n}, 2000);\n \nclearTimeout(timeoutId); \/\/ Stop the execution of the above function\n<\/pre>\n4. clearInterval FUNCTION:<\/h4>\n
\/\/ Call a function repeatedly after a delay of 1 second and then stop it using clearInterval()\nconst intervalId = setInterval(() => {\n console.log('1 second has passed');\n}, 1000);\n \nclearInterval(intervalId); \/\/ Stop the execution of the above function\n<\/pre>\nfunction printHello() {\n console.log( \"Hello, World!\");\n}\n\/\/ Now call above function after 2 seconds\nvar timeoutObj = setTimeout(printHello, 2000);\n<\/pre>\n<\/a><\/p>\n5. TextEncoder:<\/h4>\n