--- title: Learn Computing from the Experts | The Rheinwerk Computing Blog (23) description: Dive into programming, web development, and more with Rheinwerk Computing Blog! Your go-to resource for expanding your computing knowledge. (23) --- [![Rheinwerk Computing Logo](https://blog.rheinwerk-computing.com/hubfs/computing_logo-header.svg)](https://blog.rheinwerk-computing.com/) [Blog](https://blog.rheinwerk-computing.com) - Books - Get an overview of our wide selection of books on every relevant computing topic. - [General Computing](https://www.sap-press.com/rheinwerk-computing/general-computing/) - [DevOps](https://www.sap-press.com/rheinwerk-computing/devops/) - [Programming Languages](https://www.sap-press.com/rheinwerk-computing/programming-languages/) - [Security](https://www.sap-press.com/rheinwerk-computing/security/) - [Software Development](https://www.sap-press.com/rheinwerk-computing/software-development/) - Book Subscription - Get unlimited access to all Rheinwerk Computing books! - [Programming Subscription](https://sap-press.com/subscriptions/) ![](https://blog.rheinwerk-computing.com/hs-fs/hubfs/How%20to%20Write%20Your%20Own%20Python%20Functions.jpg?width=1000&name=How%20to%20Write%20Your%20Own%20Python%20Functions.jpg) [Featured](https://blog.rheinwerk-computing.com/tag/featured) | Featured article ## [How to Write Your Own Python Functions](https://blog.rheinwerk-computing.com/how-to-write-your-own-python-functions) Functions in Python provide functionality that you or someone else has already pro­grammed. In this post, we’ll teach you how to write your own Python functions. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/how-to-write-your-own-python-functions) # Latest Blog Posts [![How to Install Bash](https://blog.rheinwerk-computing.com/hs-fs/hubfs/How%20to%20Install%20Bash.png?height=600&name=How%20to%20Install%20Bash.png)](https://blog.rheinwerk-computing.com/how-to-install-bash) [Programming Languages](https://blog.rheinwerk-computing.com/tag/programming-languages) ## [How to Install Bash](https://blog.rheinwerk-computing.com/how-to-install-bash) In this blog post, we’ll teach you have to install Bash on your system. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/how-to-install-bash) [![How to Perform Matrix Multiplication with Python](https://blog.rheinwerk-computing.com/hs-fs/hubfs/How%20to%20Perform%20Matrix%20Multiplication%20with%20Python.png?height=600&name=How%20to%20Perform%20Matrix%20Multiplication%20with%20Python.png)](https://blog.rheinwerk-computing.com/how-to-perform-matrix-multiplication-with-python) [Python](https://blog.rheinwerk-computing.com/tag/python) ## [How to Perform Matrix Multiplication with Python](https://blog.rheinwerk-computing.com/how-to-perform-matrix-multiplication-with-python) *Matrix multiplication* is needed, for example, in the calculation of electrical networks. Python can perform these multiplications for you. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/how-to-perform-matrix-multiplication-with-python) [![A/B Testing in Design Projects](https://blog.rheinwerk-computing.com/hs-fs/hubfs/AB%20Testing%20in%20Design%20Projects.png?height=600&name=AB%20Testing%20in%20Design%20Projects.png)](https://blog.rheinwerk-computing.com/ab-testing-in-design-projects) [Web Development](https://blog.rheinwerk-computing.com/tag/web-development) ## [A/B Testing in Design Projects](https://blog.rheinwerk-computing.com/ab-testing-in-design-projects) A/B testing is a unique form of usability and UX testing in which at least two solution variants are compared. This testing can be conducted either... ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/ab-testing-in-design-projects) [![What Is PostgreSQL?](https://blog.rheinwerk-computing.com/hs-fs/hubfs/What%20Is%20PostgreSQL.png?height=600&name=What%20Is%20PostgreSQL.png)](https://blog.rheinwerk-computing.com/what-is-postgresql) [What Is?](https://blog.rheinwerk-computing.com/tag/what-is) ## [What Is PostgreSQL?](https://blog.rheinwerk-computing.com/what-is-postgresql) PostgreSQL has been holding its own in the open-source database market for many years. With features that usually only very expensive *enterprise...* ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/what-is-postgresql) [![Regression Analysis with Python](https://blog.rheinwerk-computing.com/hs-fs/hubfs/Regression%20Analysis%20with%20Python.png?height=600&name=Regression%20Analysis%20with%20Python.png)](https://blog.rheinwerk-computing.com/regression-analysis-with-python) [Python](https://blog.rheinwerk-computing.com/tag/python) ## [Regression Analysis with Python](https://blog.rheinwerk-computing.com/regression-analysis-with-python) A *regression analysis* is a statistical analysis method that examines the relationships between two variables. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/regression-analysis-with-python) [![The Stream API in Java Programming](https://blog.rheinwerk-computing.com/hs-fs/hubfs/The%20Stream%20API%20in%20Java%20Programming.png?height=600&name=The%20Stream%20API%20in%20Java%20Programming.png)](https://blog.rheinwerk-computing.com/the-stream-api-in-java-programming) [Java](https://blog.rheinwerk-computing.com/tag/java) ## [The Stream API in Java Programming](https://blog.rheinwerk-computing.com/the-stream-api-in-java-programming) Together with lambda expressions on the language side, an entire new library was implemented in Java 8 that makes processing datasets easy called the ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/the-stream-api-in-java-programming) [![What Is a Stream in Node.js?](https://blog.rheinwerk-computing.com/hs-fs/hubfs/What%20Is%20a%20Stream%20in%20Nodejs.png?height=600&name=What%20Is%20a%20Stream%20in%20Nodejs.png)](https://blog.rheinwerk-computing.com/what-is-a-stream-in-node.js) [JavaScript](https://blog.rheinwerk-computing.com/tag/javascript) ## [What Is a Stream in Node.js?](https://blog.rheinwerk-computing.com/what-is-a-stream-in-node.js) “We should have some ways of connecting programs like garden hose—screw in another segment when it becomes necessary to massage data in another way.” ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/what-is-a-stream-in-node.js) [![What Is Azure DevOps?](https://blog.rheinwerk-computing.com/hs-fs/hubfs/What%20Is%20Azure%20DevOps.png?height=600&name=What%20Is%20Azure%20DevOps.png)](https://blog.rheinwerk-computing.com/what-is-azure-devops) [What Is?](https://blog.rheinwerk-computing.com/tag/what-is) ## [What Is Azure DevOps?](https://blog.rheinwerk-computing.com/what-is-azure-devops) Azure DevOps is Microsoft’s offering for companies to conduct modern software development with *continuous integration/continuous deployment (CI/CD)* ... ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/what-is-azure-devops) [![How to Create Your First Node.js Application](https://blog.rheinwerk-computing.com/hs-fs/hubfs/How%20to%20Create%20Your%20First%20Node.js%20Application.png?height=600&name=How%20to%20Create%20Your%20First%20Node.js%20Application.png)](https://blog.rheinwerk-computing.com/how-to-create-your-first-nodejs-application) [Programming Languages](https://blog.rheinwerk-computing.com/tag/programming-languages) ## [How to Create Your First Node.js Application](https://blog.rheinwerk-computing.com/how-to-create-your-first-nodejs-application) When you create applications using Node.js, the source code of that application is contained in one or more files. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/how-to-create-your-first-nodejs-application) [![What Are the Principles of Functional Programming?](https://blog.rheinwerk-computing.com/hs-fs/hubfs/What%20Are%20the%20Principles%20of%20Functional%20Programming.png?height=600&name=What%20Are%20the%20Principles%20of%20Functional%20Programming.png)](https://blog.rheinwerk-computing.com/what-are-the-principles-of-functional-programming) [What Is?](https://blog.rheinwerk-computing.com/tag/what-is) ## [What Are the Principles of Functional Programming?](https://blog.rheinwerk-computing.com/what-are-the-principles-of-functional-programming) Functional programming, like other programming paradigms, follows different principles or has special characteristics. These are essentially as... ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/what-are-the-principles-of-functional-programming) - - [1](https://blog.rheinwerk-computing.com/page/1) - [...](https://blog.rheinwerk-computing.com/page/18) - [21](https://blog.rheinwerk-computing.com/page/21) - [22](https://blog.rheinwerk-computing.com/page/22) - [23](https://blog.rheinwerk-computing.com/page/23) - [24](https://blog.rheinwerk-computing.com/page/24) - [25](https://blog.rheinwerk-computing.com/page/25) - [...](https://blog.rheinwerk-computing.com/page/28) - [30](https://blog.rheinwerk-computing.com/page/30) - ### Blog Topics - [All Topics](https://blog.rheinwerk-computing.com) - [Programming Languages](https://blog.rheinwerk-computing.com/tag/programming-languages) - [How To](https://blog.rheinwerk-computing.com/tag/how-to) - [DevOps](https://blog.rheinwerk-computing.com/tag/devops) - [JavaScript](https://blog.rheinwerk-computing.com/tag/javascript) - [Featured](https://blog.rheinwerk-computing.com/tag/featured) - [Cybersecurity](https://blog.rheinwerk-computing.com/tag/cybersecurity) - [What Is?](https://blog.rheinwerk-computing.com/tag/what-is) - [Artificial Intelligence](https://blog.rheinwerk-computing.com/tag/artificial-intelligence) - [Web Development](https://blog.rheinwerk-computing.com/tag/web-development) - [Software Development](https://blog.rheinwerk-computing.com/tag/software-development) **Subscribe to our blog!**Get notified about future blog updates. - - - ### Most Popular Blog Posts 1. 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