Programming Leftovers

• Vue Computed with Parameter

  The Computed property is usually used to compute data from some other data. It is known for its reactivity because whenever a variable involved in some computed property gets changed, the whole property gets recomputed.This post will learn to pass the parameter to computed property and see how to use Vue computed with parameter. Before getting started with passing parameters to the computed property, let’s first understand the computed properties by going through the example.

• Vue Computed Property not updating; Troubleshooting Steps

  Vue.js is a very popular JavaScript library that is known for its reactivity, flexibility, and intuitive API. However, reactivity and flexibility come with some drawbacks, leading to the developer’s performance or a headache. The computed property is a very famous and most known feature of Vue.js, which is used to update some variable or perform some calculation depending upon some other variable’s updation. This post will try to troubleshoot the problems that occurred when the computed property does not work or update what we want. Let’s have a look at the scenarios, what might go wrong, and Vue Computed Property not updating.

• How to Use Heredoc in Shell Scripting

  Here document (Heredoc) is an input or file stream literal that is treated as a special block of code. This block of code will be passed to a command for processing. Heredoc originates in UNIX shells and can be found in popular Linux shells like sh, tcsh, ksh, bash, zsh, csh. Notably, other programming languages like Perl, Ruby, PHP also support heredoc. Structure of Herdoc Heredoc uses 2 angle brackets (<<) followed by a delimiter token. The same delimiter token will be used to terminate the block of code. Whatever comes within the delimiter is considered to be a block of code. Look at the example below. I am redirecting the block of code to the cat command. Here the delimiter is set to “BLOCK” and terminated by the same “BLOCK“.

• LLVM Clang Mainlines Support For The Motorola 68000 Series (m68k) - Phoronix

  If it wasn't odd enough during these pandemic times seeing Nintendo 64 support upstreamed into the Linux 5.12 kernel a few weeks back, the latest vintage hardware seeing open-source support still going on is the Motorola 68000 series 32-bit processors. LLVM/Clang today merged the "m68k" target for these three decade old processors. The Motorola 68000 (m68k) 32-bit processors were found in early Apple Macintosh computers, the Amiga, Sega Genesis, and other vintage devices. Motorola hasn't even been developing the 68000 series since the mid 90's but it has remained popular in some retro computing circles and still sees Linux/open-source work.

• How CSS Positioning and Flexbox Work – Explained with Examples

  If you have ever used CSS, then you know how hard it is to position elements. But by the end of this tutorial you'll know much more about CSS positioning and Flexbox, and you'll be able to position elements in your dream project like a boss.

• How Classes Work in C++

  C++ supports Object Oriented Programming, and classes and objects are the heart of this programming paradigm. You might be wondering – what is a class and why do we need them? In this article I'll go over some basics to help you understand how classes work in C++.

• A Jetpack Compose Tutorial for Beginners – How To Understand Composables & Recomposition

  This tutorial will teach you a few fundamental concepts and terms related to the Jetpack Compose UI Library on Android. While this is a beginner's guide to Compose, it will not be a beginner's guide to Android – so you should have built at least an application or two (though not in Compose, necessarily). Before we begin, I was initially planning to write a follow up article directed towards more senior developers until I came across Leland Richardson’s two part article series. Leland is not only a Software Engineer working on the Jetpack Compose team, but I see that he is a great writer as well.

• Git Cheat Sheet – 50 Git Commands You Should Know

  A distributed version control system is a system that helps you keep track of changes you've made to files in your project. This change history lives on your local machine and lets you revert to a previous version of your project with ease in case something goes wrong. Git makes collaboration easy. Everyone on the team can keep a full backup of the repositories they're working on on their local machine. Then, thanks to an external server like BitBucket, GitHub or GitLab, they can safely store the repository in a single place. This way, different members of the team can copy it locally and everyone has a clear overview of all changes made by the whole team. Git has many different commands you can use. And I've found that these fifty are the ones I use the most often (and are therefore the most helpful to remember).

today's howtos

• Installing Apache CouchDB on Fedora

  Developed by Apache software foundation, CouchDB is a database management system that stores data in JSON documents. We can access our data using the HTTP protocol. Similarly, we can manipulate the data with JavaScript.

• How to Install PHP 8 on Linux Mint 20? – Linux Hint

  Being a popular server-side scripting language, PHP is used in the creation of dynamic websites, content management systems, and many famous frameworks such as Laravel, WordPress, etc which are developed in PHP. As of preparing this post, the latest stable release of PHP is 8.2.

• How to Install Steam on Linux Mint 20? – Linux Hint

  Developed by Valve Corporation, steam is a multi-platform application for playing games. There are 30,000+ games available on Steam. Using Steam, you can meet and interact with new people. It can be installed on Linux Mint 20 from the Software Manager utility, from the terminal using the apt command, and from the steam official website.

• How to Create Simple Shell Scripts in Linux Using Vim – Linux Hint

  Shell Scripting executes commands to perform some useful functions and is designed to run in the shell. Shell scripts are quite handy to perform operations like file manipulation, automating tasks to avoid time consumption; you can even create your commands. Shell is an interface between the user and operating system that lets users interact with the operating system and perform various tasks using commands. Shell takes input from the user through the terminal, interacts with the kernel, processes it, and gives the output.

• How to Create and Delete Users on CentOS 8 – Linux Hint

  User management is much needed and must-know technique for a Linux server administrator. A Linux administrator often needs to create and grant different privileges and permissions to different users. This post will perform a couple of tasks like creating and deleting the user on the CentOS 8 Operating system. As you know, the creation and deletion of a user is an administrative type of task, and for performing such tasks, you must log in as a root user or execute all the commands with the sudo privileges. Let’s start and see how to add or create a user in the CentOS 8 system.

• How to Customize a Bash Shell with the shopt Command – Linux Hint

  Shopt is a built-in command in Unix-like operating systems, such as macOS and Linux distributions. The “shopt” command provides control over many settings that are used to tweak the operations in a Bash shell. This article shows you how to work with the “shopt” command in Linux. Since this command is built-in, it is not required to install this command to use it. The number of options available for the “shopt” command varies from version to version; older versions will have fewer commands compared to newer versions. Some options in Bash are enabled or disabled by default, but these options can temporarily be tweaked, once you restart the shell, these options will be reverted. However, it is also possible to permanently change these options if you are interested in keeping a tweaked version of the shell.

Python Programming

• How to Filter Data in Django? – Linux Hint

  It is a very common requirement for the web application to display data on the web page based on the user’s interest. The searching feature of the application makes it more user-friendly. Django framework has a built-in filter() method to filter data from the database tables. A table can contain many records and sometimes determining some specific data are required based on the particular criteria. This task becomes easier by using the filter() method in different ways. How the data from a database table can be filtered using the filter method in four different ways will be discussed in this tutorial.

• How to Create Django Templates? – Linux Hint

  A template contains HTML data that is generated from a view and displayed in the browser. The static and dynamic HTML pages can be created using the template. Logic and design have been kept separately in the Django application. Python code can’t be used directly in the Django template because the browser can’t interpret the python code. The designer can design the HTML pages only with the necessary format or styling, and the coder adds the static or dynamic data into the template using Django Template Language (DTL). How the Django template can be created and how the DTL can be used to add static or dynamic content to the template have been shown in this tutorial.

• How to Create Django Form? – Linux Hint

  The use of the form is an essential part of any web application. The input from the website users can be taken using the form. It can contain different types of fields, such as text box, combo box, check box, radio button, etc. to take data from the users. Django framework contains a large number of libraries to help the web developer to design an HTML form for taking input from the user, process the input, and respond to the user’s input. How HTML form can be used to take data from the user, read the input values, and print the values in the browser using Django is shown in this tutorial.

• How to Get Started with Pandas in Python – a Beginner's Guide

  The Pandas package in Python gives you a bunch of cool functions and features that help you manipulate data more efficiently. It also lets you perform numerous data cleaning and data preprocessing steps with very little hassle. That's great isn't it? Here's a list of some of the most frequently used Pandas functions and tricks to help you enjoy your data science journey.