Author: Rahul

JavaScript is a versatile programming language that supports a wide range of programming paradigms. One of the most powerful features of JavaScript is closures, which allow developers to create powerful and flexible code. In this article, we will explore what closures are and how they work, along with some examples. What is a Closure in JavaScript? A closure is an inner function that has access to the outer function’s variables, parameters, and arguments. The inner function can access these variables even after the outer function has returned. A closure allows you to encapsulate and protect data within a function, preventing…

JavaScript is a versatile and powerful programming language that has been used extensively in the development of web applications. As a developer, it’s essential to have a solid understanding of the language’s capabilities and advanced techniques to create robust, efficient, and scalable web applications. Here are 15 advanced JavaScript techniques that every developer should know. 1. Closures Closure is a powerful technique in JavaScript that allows you to create functions with persistent state. Essentially, a closure is a function that “remembers” the environment in which it was created. This can be useful for creating private variables, as well as for…

Async/await is a feature of JavaScript that allows developers to write asynchronous code in a more synchronous-looking way. With async/await, developers can write code that waits for an asynchronous operation to complete, without blocking the main thread of execution. In this article, we’ll explore how to use async/await in JavaScript with some examples. Syntax of Async/Await The syntax of async/await is fairly simple. To define an asynchronous function, you add the async keyword before the function keyword, like this:

Inside the async function, you can use the await keyword to wait for a Promise to resolve, like this:

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Zsh is a powerful shell that provides a wide range of features and functionalities to enhance the user’s experience. One of the key features of Zsh is its support for special variables, which allow users to perform various tasks easily and efficiently. In this article, we will explore some of the most useful special variables in Zsh and discuss how they can be used to improve your shell scripts. $0 – Get the running script name The $0 variable in Zsh refers to the name of the current script or shell being executed. This variable is particularly useful when you…

Sed, short for “stream editor”, is a powerful text-processing tool that is commonly used in Linux and Unix systems. It can perform a wide range of operations on text files, including searching, replacing, inserting, and deleting lines. One common task that users often need to perform with Sed is uncommenting lines in a text file. In this article, we’ll provide a guide to mastering Sed and using it to uncomment lines in text files. Before we dive into the specifics of using Sed to uncomment lines, let’s first define what we mean by “uncommenting.” In programming, a comment is a…

Disk Input/Output (I/O) is a critical aspect of system performance in Linux environments. Efficiently monitoring and managing disk I/O is essential for system administrators, as it enables them to identify potential bottlenecks, troubleshoot performance issues, and optimize their systems. This comprehensive guide will cover various tools and techniques to monitor disk I/O in Linux systems. 1. Understanding Disk I/O Disk I/O refers to the process of reading data from or writing data to a storage device, such as a hard disk or solid-state drive. High disk I/O can lead to slow system performance and impact overall user experience. Monitoring disk…

Sending emails is an essential task for system administrators, and PowerShell makes it simple to automate this process using remote SMTP. In this article, we will provide you with a PowerShell script that will send an email through remote SMTP. This script will allow you to send emails automatically, without having to do it manually, saving you time and improving your productivity as a system administrator. By creating this PowerShell script, you can automate your email sending process, and ensure that the messages are sent quickly and efficiently, without having to worry about typing out the same email over and…

Bash is a powerful shell that provides a wide range of special variables that can be used to manipulate and control the behavior of scripts. These variables provide essential information about the environment in which the script is running, including the command-line arguments, the current process ID, and the status of the last executed command. In this article, we’ll provide an in-depth guide to all bash special variables, including examples of their usage and common pitfalls to avoid. `$0` – The name of the script being executed. `$1-$9` – The first nine command-line arguments. `$#` – The number of command-line…

Bash is a powerful scripting language that can be used for a variety of tasks, including mathematical calculations. However, working with numbers in Bash can be challenging, especially when dealing with floating-point arithmetic, large numbers, and complex calculations. In this article, we will explore some tips and tricks for mathematical calculations in Bash. Use the Right Tool for the Job Bash has several built-in tools for performing mathematical calculations, such as the (( )) and $(( )) operators, the expr command, and the bc command. Each tool has its strengths and weaknesses, and choosing the right one can make a…

When it comes to mathematical calculations in Bash, there are a few built-in tools that you can use, such as the expr command and the “(( ))” arithmetic expression. However, there are also other tools that can come in handy, such as awk and sed, which are powerful text processing tools that can be used to perform calculations on data stored in files or output by other commands. In this article, we will explore how to use awk, bc, and expr to perform math calculations in Bash, and how to choose the right tool for the job. Using Awk for…