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Programming Leftovers

Submitted by Roy Schestowitz on Monday 14th of March 2022 01:41:33 PM Filed under
Development

  • How to Create a Hello World Program in Rust

    There is one building block that all programmers share: a Hello World program. It is a simple but standard program that is specifically designed to be an introduction to a new language. In any language, the Hello World program, introduces the new users to the syntax of the language.

    In this article, we will explore how to create our first Hello World program and discuss the anatomy of the Hello World program in Rust.

  • Bash Assign Default Value if Variable Unset

    In Bash programming, variables play a vital part in transforming the script to a modern standard. Variables are named symbols representing a string or numeric value. Check out this in-depth guide on Bash variables for more info.

    When creating a Bash variable, it must have a value. However, we can use some tricks to set a default value if the variable is not set (or null). This guide will demonstrate how to do just that.

  • PySpark – Sort()

    In Python, PySpark is a spark module used to provide a similar kind of processing like spark using DataFrame. In PySpark, sort() is used to arrange the rows in sorting or ascending order in the DataFrame. It will return the new dataframe by arranging the rows in the existing dataframe. Let’s create a PySpark DataFrame.

  • PySpark – OrderBy()

    In Python, PySpark is a spark module used to provide a similar kind of processing like spark using DataFrame. In PySpark, orderBy() is used to arrange the rows in sorting/ascending order in the DataFrame.

    It will return the new dataframe by arranging the rows in the existing dataframe.

    Let’s create a PySpark DataFrame.

  • Dancer2 0.400000 Released | Jason A. Crome [blogs.perl.org]

    We realize that some of you might be curious as to the large version bump. There are a couple of reasons for this: * Modules we depend on bumped their minimum Perl version to 5.12, requiring us to follow suit. * As of 2022, Dancer2 has an official deprecation policy. We are implementing this policy effective with this release, and it will help shape and guide future development. * We've officially marked a lot of outdated and unused API as being deprecated.

  • How to monetize your cross-platform application with the Qt Digital Advertising platform [Ed: Qt wants Free software developers (and users) to vomit not just because Qt became proprietary]

    Welcome to the third installment of our blog series on digital advertising on embedded and mobile platforms with Qt. In this part, we’re looking into the main challenges associated with cross-platform digital advertising and how Qt can make them a thing of the past for you.

  • It takes a village

    As a prolific maintainer of several dozen FOSS projects, I’m often asked how I can get so much done, being just one person. The answer is: I’m not just one person. I have enjoyed the help of thousands of talented people who have contributed to these works. Without them, none of the projects I work on would be successful.

    I’d like to take a moment to recognize and thank all of the people who have participated in these endeavours. If you’ve enjoyed any of the projects I’ve worked on, you owe thanks to some of these wonderful people. The following is an incomplete list of authors who have contributed to one or more of the projects I have started...

  • Kruskal Algorithm

    A graph that doesn’t have directions is called an undirected graph. Every graph must have a path from one node to another node. A spanning tree is also an undirected connected graph where all the nodes of the graph are present with minimum edges. If a spanning tree doesn’t have all the nodes of the graph, then we cannot say that it is a spanning tree. The spanning-tree total weights will be less than the original weight of the graph as we connected it through the minimum weight edges. The spanning tree also does not have a cycle. Any graph has more than one spanning tree, but only one of those will be unique. We call it a minimal spanning tree since we’re attempting to create a full graph with all nodes while keeping the weight low.

  • LinkedList in Java

    Java provides a LinkedList class which is nothing but an ordered collection that holds multiple objects of the same data type. It belongs to the collection framework of java.util package and it extends/inherits the AbstractList class. The LinkedList class provides numerous methods to perform different functionalities e.g. add() method, remove() method, and many more.

  • ArrayList in Java

    In any programming language, a very significant concept is used to store the data named Arrays. The arrays are static/fixed in size and suitable for fixed-length data structures. But what if someone wants to add or remove the items dynamically? Well in Java, we can utilize the concept of ArrayList which allows us to store the data dynamically and is resizable.

  • ArrayList vs LinkedList in Java | Explained

    In java, ArrayList and LinkedList both belong to the Collection framework of java.util package and both of them inherit the List class. If we talk about the comparison of both these lists, it can be made based on different features, similarities, and differences. Sometimes LinkedList is preferred to use while in some cases, ArrayLists have dominance and are preferred to use.

  • Enum in Java | Explained

    Java provides an enum class that can be used to represent a group of constants and it can have class attributes, member functions, and constructors. Enum class can’t inherit some other class but it can implement different interfaces and we can’t create the object of the enum class.

    In java, if we have to specify a single value as constant we can use the final keyword. However if we have to specify a group/set of constants then we can utilize the concept of enums. In java, numerous methods are available that can be used to perform various functionalities like values(), ordinal(), and many more.

»

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today's howtos

  • How to install go1.19beta on Ubuntu 22.04 – NextGenTips

    In this tutorial, we are going to explore how to install go on Ubuntu 22.04 Golang is an open-source programming language that is easy to learn and use. It is built-in concurrency and has a robust standard library. It is reliable, builds fast, and efficient software that scales fast. Its concurrency mechanisms make it easy to write programs that get the most out of multicore and networked machines, while its novel-type systems enable flexible and modular program constructions. Go compiles quickly to machine code and has the convenience of garbage collection and the power of run-time reflection. In this guide, we are going to learn how to install golang 1.19beta on Ubuntu 22.04. Go 1.19beta1 is not yet released. There is so much work in progress with all the documentation.

  • molecule test: failed to connect to bus in systemd container - openQA bites

    Ansible Molecule is a project to help you test your ansible roles. I’m using molecule for automatically testing the ansible roles of geekoops.

  • How To Install MongoDB on AlmaLinux 9 - idroot

    In this tutorial, we will show you how to install MongoDB on AlmaLinux 9. For those of you who didn’t know, MongoDB is a high-performance, highly scalable document-oriented NoSQL database. Unlike in SQL databases where data is stored in rows and columns inside tables, in MongoDB, data is structured in JSON-like format inside records which are referred to as documents. The open-source attribute of MongoDB as a database software makes it an ideal candidate for almost any database-related project. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the MongoDB NoSQL database on AlmaLinux 9. You can follow the same instructions for CentOS and Rocky Linux.

  • An introduction (and how-to) to Plugin Loader for the Steam Deck. - Invidious
  • Self-host a Ghost Blog With Traefik

    Ghost is a very popular open-source content management system. Started as an alternative to WordPress and it went on to become an alternative to Substack by focusing on membership and newsletter. The creators of Ghost offer managed Pro hosting but it may not fit everyone's budget. Alternatively, you can self-host it on your own cloud servers. On Linux handbook, we already have a guide on deploying Ghost with Docker in a reverse proxy setup. Instead of Ngnix reverse proxy, you can also use another software called Traefik with Docker. It is a popular open-source cloud-native application proxy, API Gateway, Edge-router, and more. I use Traefik to secure my websites using an SSL certificate obtained from Let's Encrypt. Once deployed, Traefik can automatically manage your certificates and their renewals. In this tutorial, I'll share the necessary steps for deploying a Ghost blog with Docker and Traefik.

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