<a              href="https://www.sitepoint.com/javascript-error-handling/?utm_source=rss"              title="The Ultimate Guide to JavaScript Error Handling"              rel="nofollow"            >              <img        class="webfeedsFeaturedVisual"        style="display: block; margin: auto; margin-bottom: 5px;max-width: 100%;"        src="https://uploads.sitepoint.com/wp-content/uploads/2023/01/1674711853javascript-error-handling.jpg"        alt="The Ultimate Guide to JavaScript Error Handling"        srcset="https://uploads.sitepoint.com/wp-content/uploads/2023/01/1674711853javascript-error-handling-300x170.jpg 300w, https://uploads.sitepoint.com/wp-content/uploads/2023/01/1674711853javascript-error-handling-1024x580.jpg 1024w, https://uploads.sitepoint.com/wp-content/uploads/2023/01/1674711853javascript-error-handling-768x435.jpg 768w, https://uploads.sitepoint.com/wp-content/uploads/2023/01/1674711853javascript-error-handling.jpg 1200w"        sizes="(max-width: 300px) 100v

The Ultimate Guide to JavaScript Error Handling — SitePoint. We can throw our own exceptions when an error occurs — or should occur.

SitePoint

Posted on Mar 7                  Hello my beginner frontend developers, today i will be showing Javascript string methods in 2 different categories - Important and rarely used.Let's get started...Which method according to you is more or less important in a real world project?THANK YOU FOR CHECKING THIS POSTYou can contact me on -Instagram - https://www.instagram.com/supremacism__shubh/LinkedIn - https://www.linkedin.com/in/shubham-tiwari-b7544b193/Email - shubhmtiwri00@gmail.comYou can help me with some donation at the link below Thank you👇👇☕ --> https://www.buymeacoffee.com/waaduheck <--Also check these posts as wellTemplates let you quickly answer FAQs or store snippets for re-use.        Are you sure you want to hide this comment? It will become hidden in your post, but will still be visible via the comment's permalink.      Hide child comments as well                  Confirm              For further actions, you may consider blocking this person and/or reporting abuse              Julia 👩🏻‍💻 GDE - Feb 18                          Siddhartha Mishra - Feb 18                          Adrian Sandu - Feb 16                          Temani Afif - Mar 4                  DEV Community — A constructive and inclusive social network for software developers. With you every step of your journey.    Built on Forem — the open source software that powers DEV and other inclusive communities.Made with love and Ruby on Rails. DEV Community © 2016 - 2024.          We're a place where coders share, stay up-to-date and grow their careers.

Javascript | String Methods. With you every step of your journey.

DEV Community

Javascript | String Methods

Posted on Mar 7                  With the constant developing software industry, building the robust, scalable and maintainable apps is a constant pursuit.In order to achieve such great challenges we have microservices. As the name suggest, these can be judged as multiple small services that are integrated together to form one complete application.And when we write these services with the help of the Nodejs, these are then known as the microservices with nodejs.Microservices architecture decomposes complex applications into independent, loosely coupled services. Each service encapsulates a specific functionality, communicates with others through well-defined APIs (Application Programming Interfaces), and is independently deployable. This approach offers several advantages:Scalability: Individual services can be scaled independently based on their specific needs, ensuring efficient resource utilization.Agility: Development teams can work on and deploy services in isolation, leading to faster development cycles and easier maintenance.Resilience: Failure in one service has minimal impact on others, enhancing overall application reliability.Technology Agnosticism: Different services can be built with different languages and technologies, fostering flexibility.Node.js, with its event-driven, non-blocking I/O model, is particularly adept at building microservices.Here's why:Lightweight and Efficient: Node.js excels at handling numerous concurrent connections, making it ideal for microservices that handle high volumes of requests.Rapid Development: JavaScript, the language behind Node.js, is known for its ease of use and extensive ecosystem of libraries and frameworks, accelerating development.Community and Support: Node.js boasts a vast and active community, providing ample resources and support for developers venturing into microservices.There is a lot more to learn about what are microservices and how to efficiently use the microservice architecture while building your back-end. Here are some of the resources that will help beginners to get started with the microservices in NodejsHands-On Mircroservices with Nodejs by :- Diogo Resende .YT channel explaining microservices with nodejs  .Feel free to make a learning project github repository and reach out to me, to learn together and collaborate to develop your first Nodejs back-end system with MicroservicesHappy Coding!! Templates let you quickly answer FAQs or store snippets for re-use.        Are you sure you want to hide this comment? It will become hidden in your post, but will still be visible via the comment's permalink.      Hide child comments as well                  Confirm              For further actions, you may consider blocking this person and/or reporting abuse              Ramu Narasinga - Feb 27                          Akash Pattnaik - Feb 27                          Rubén Alapont - Feb 27                          Ricardo Esteves - Mar 2                  DEV Community — A constructive and inclusive social network for software developers. With you every step of your journey.    Built on Forem — the open source software that powers DEV and other inclusive communities.Made with love and Ruby on Rails. DEV Community © 2016 - 2024.          We're a place where coders share, stay up-to-date and grow their careers.

#Microservices in Nodejs. Here are some of the resources that will help beginners to get started with the microservices in NodejsHands-On Mircroservices with Nodejs by :- Diogo Resende

#Microservices in Nodejs

Posted on Mar 7                  Understanding discrete mathematics is crucial to acquiring in-depth knowledge in various areas of Computer Science, such as algorithms, data structures, computing theory, and cryptography. Unlike Continuous Mathematics, which deals with infinite and continuous structures, discrete mathematics focuses on the study of finite and discrete processes.At the heart of discrete mathematics lies mathematical logic, which investigates the principles of valid reasoning. Using symbols and precise rules, mathematical logic allows the systematic and rigorous representation and manipulation of propositions (statements). This approach provides a precise and detailed analysis of systems, constituting a fundamental basis for several fields of Computer Science.In this article we will present basic concepts of mathematical logic, such as propositions, connectives and truth tables.A proposition is a statement that can be either true or false. For example:Note that not every sentence is a proposition:Simple propositions, which cannot be further decomposed, are known as atomic propositions, while compound propositions are constructed from these atomic elements linked by connectives. The truth value of a compound proposition is determined by the truth values assigned to its individual atomic propositions.A conjunction is a compound proposition in the form p ∧ q, where p and q are propositions. The truth value of this proposition is true only if both propositions are true.In programming, we use generally use the && symbol to control the program flow with conjuntions.The truth table of the connective ∧ is:A truth table is a representation that shows the different combinations of logical values for each component of a proposition. In a truth table, the columns represent the simple component propositions and a compound proposition, while the rows represent the various possible combinations of true and false for these propositions. We can use the truth table to summarize how a connective behaves.A disjunction is a compound proposition in the form p ∨ q, where p and q are propositions. The truth value of this proposition is true if at least one of the propositions is true.The truth table of the connective ∨ is:In programming, we use generally use the || symbol.This disjunction is called exclusive in the sense that it allows only one proposition to be true so that it results in the true logical value. We use the ⊕ operator to generate this disjunction. See the truth table:This is also called eXclusive OR (XOR).The negation of a proposition generates a new proposition with the opposite logical value to the original. In this way, if the proposition is true, the new one will be false and vice versa. We have the ¬ operator (we generally use ! in programming). See the truth table for this operator:In languages like JavaScript we use double negation to convert a truthy value into a boolean: !!p A proposition of the form p → q is called an implication or conditional, where p is a proposition called an antecedent and q is a proposition called a consequent. This proposition will be false only if the antecedent is true but the consequent is not. We can see this operator in the truth table:Programming languages have a conditional structure similar to this, called if.A proposition in the form p ↔ q is called biconditional or equivalence, also used as "if and only if". It is true only if both propositions have the same logical value. See the truth table:Through propositions, connectives, and truth tables, we have only scratched the surface of mathematical logic, which enables precise reasoning and system analysis. A solid understanding of mathematical logic not only enhances your analytical skills in programming but also helps in problem-solving and bug fixing effectively.Templates let you quickly answer FAQs or store snippets for re-use.        Are you sure you want to hide this comment? It will become hidden in your post, but will still be visible via the comment's permalink.      Hide child comments as well                  Confirm              For further actions, you may consider blocking this person and/or reporting abuse              Dwayne Crooks - Aug 7 '19                          Anna Buianova - Jul 30 '19                          Juneau Lim - Jul 13 '19                          Contra - Jul 12 '19                  DEV Community — A constructive and inclusive social network for software developers. With you every step of your journey.    Built on Forem — the open source software that powers DEV and other inclusive communities.Made with love and Ruby on Rails. DEV Community © 2016 - 2024.          We're a place where coders share, stay up-to-date and grow their careers.

Discrete Maths for Devs: An brief introduction to Mathematical Logic. A disjunction is a compound proposition in the form p ∨ q, where p and q are propositions.

Discrete Maths for Devs: An brief introduction to Mathematical Logic

Posted on Mar 7                      • Originally published at phuoc.ng                   Here's what we'll cover:The macOS Calculator app is a simple but powerful tool that has been included with every Mac for many years. It lets you do basic arithmetic functions like addition, subtraction, multiplication, and division. The app's interface is clean and user-friendly, which makes it a go-to tool for anyone needing quick calculations.In this post, we'll explore how to create a macOS calculator layout using HTML and CSS. To make it fully functional, we'll need JavaScript to implement the real calculator. But we'll skip this part and focus solely on creating the layout.Before we get into the details, here's the final layout we'll be creating:The calculator is constructed using various elements, including a div element to display the result and several buttons that allow users to interact with it.It's all pretty straightforward. We've added div and button elements in the order they appear on the calculator, from top to bottom and left to right.The result element has the calculator__result class, while all the buttons have the calculator__key class.Let's talk about how to create a grid layout for our calculator. Imagine the calculator as a grid of 4 columns and 6 rows. To make this happen, we use the display: grid property which sets the root element as a grid container. Then, we can define the number of columns and rows in our grid using grid-template-columns and grid-template-rows.To keep things simple, we use the repeat() function to set up our grid without having to manually specify each column or row. In this case, we want a grid with 4 columns, each with a width of 4rem, and 6 rows, each with a height of 4rem. This creates a neat and uniform grid where each cell has equal dimensions.Here are the CSS styles we apply to the root element of the calculator:Let's take a closer look at the result element in our calculator layout. This is the big box at the top that shows all the calculations. We make it take up the whole first row of the layout using a special CSS property called grid-column. Remember how we talked about grid-column-start and grid-column-end in our previous post? Well, we set grid-column to 1/5. This means the element starts at column 1 and ends at column 5, effectively covering the whole top row of the layout.With this one simple CSS trick, the result element now dominates the top row of our calculator layout.Next, let's talk about the special button that allows users to enter the number zero. This button takes up two cells in our grid. To make it span two columns, we use the grid-column property to position it. We add a new CSS class with the declaration grid-column: 1 / 3; to style the zero button and set its position in the grid layout.To align the result element to the right of its cell, we can use the justify-content property with a value of end. This will push the contents of our result element to the right. We can also set the align-items property to center and add some padding to the right side using the padding-right property, to make it look more visually pleasing. Depending on the font size, you may need to manually adjust the padding-right value.By using these declarations, we have aligned the result element to the right side of its cell while keeping it centered vertically.To make our buttons look sleek and professional, we need to center their content. Luckily, we can easily achieve this with CSS flexbox. By adding display: flex to our .calculator__key CSS class, we can turn each button into a flex container. This allows us to use align-items and justify-content properties to align the content of our buttons both horizontally and vertically.In this case, we want to center the text inside each button. To do this, we simply add the following declaration to our .calculator__key CSS class:By making these declarations, the content of all our buttons will now be centered both horizontally and vertically within their respective cells in the grid layout.To make the calculator look like the real deal, we can change the background and text colors of the result and buttons. It's a simple fix. Here's an easy implementation using the background property to adjust the background color of these elements:Check out the demo below:In this post, we explored how to create a macOS-style calculator layout using HTML and CSS. We learned how to use the grid-template-columns and grid-template-rows properties to define the number of columns and rows in our grid layout.Additionally, we discovered how to use the grid-column property to adjust the placement of a grid item. By using align-items, justify-content, and display properties with flexbox, we were able to align the content of our buttons both horizontally and vertically.As you can see, the macOS calculator layout is just one example of the many amazing things that can be achieved with CSS grid.If you found this series helpful, please consider giving the repository a star on GitHub or sharing the post on your favorite social networks 😍. Your support would mean a lot to me!If you want more helpful content like this, feel free to follow me:Templates let you quickly answer FAQs or store snippets for re-use.        Are you sure you want to hide this comment? It will become hidden in your post, but will still be visible via the comment's permalink.      Hide child comments as well                  Confirm              For further actions, you may consider blocking this person and/or reporting abuse              Joseph - Feb 17                          Pieces 🌟 - Mar 1                          Raza - Feb 21                          Siddhartha Mishra - Feb 18                  DEV Community — A constructive and inclusive social network for software developers. With you every step of your journey.    Built on Forem — the open source software that powers DEV and other inclusive communities.Made with love and Ruby on Rails. DEV Community © 2016 - 2024.          We're a place where coders share, stay up-to-date and grow their careers.

Create a macOS calculator layout. Before we get into the details, here's the final layout we'll be creating:. To align the result element to the right of its cell, we can use the justify-content property with a value of end.. Additionally, we discovered how to use the grid-column property to adjust the placement of a grid item.

Create a macOS calculator layout

Posted on Mar 6                      • Originally published at selftaughttxg.com                   In this article, I will continue to cover React concepts I am learning by pair programming with AI to create a Star Wars Ahsoka website.This article will focus on adding YouTube videos to a React project. In addition, I covered adding a helper JavaScript file, including a "handleVideoClick" function. I also cover how I implemented the YouTube videos into my project, how I conditionally rendered the YouTube components, and some issues I ran into while incorporating it.If you've been following along with this article series or would like a more in-depth explanation of how to incorporate YouTube videos in React projects, feel free to continue reading this article!Building on the series of articles about creating a "Star Wars Ahsoka React website," understanding the implementation of YouTube videos requires familiarity with certain concepts. Please refer to my previous articles to understand the custom components and functions used.The prerequisites for creating the dropdown menu include:Familiarity with the Menu and Navbar components.Familiarity with the StarWarsCard, SmallCardContent, and LargeCardContent components.Understanding of the mapItems function used for generating multiple components.Familiarity with the Hamburger menu component.Developing a Dynamic Hamburger Menu in React: A Step-by-Step GuideBuilding a Dropdown Menu in React: A Step-by-Step GuideA Guide to Better Code Organization in React through File SeparationLearn to Use Component Identifiers as Props for Rendering Various HTML Elements DynamicallyThe React YouTube library is a tool that makes adding YouTube videos to your React applications easy. It works like a bridge between the YouTube video platform and your React project, allowing you to use a component to embed and control YouTube videos directly on your web pages. With this library, all I need to do is install it, drop a YouTube component into your project, and tell it which video you want to show by giving it the video's ID.To further enhance the functionality and appearance of the embedded YouTube videos in your React application, the React YouTube Library offers theoptsobject. This feature provides a wide range of customizable options that adhere to the YouTube IFrame Player API specifications, allowing for a tailored viewing experience.Theoptsobject in thereact-youtubecomponent allows you to customize the YouTube player with various options. These options are derived from the YouTube IFrame Player API and can include:height: The height of the player.width: The width of the player.playerVars: An object containing player parameters such as:Please note that YouTube may update or change these parameters, so it's a good idea to refer to the official YouTube IFrame Player API documentation for the most current information and additional parameters.I added a YouTube object array consisting of name, image, about, and youtubeId keys to implement YouTube videos to my Star Wars Ahsoka React project. With this method, I can use my previously created mapping function to render the YouTube videos in conjunction with my SmallCardContent and LargeCardContent card components.Note: I also had to add the youtube object array to the export.💡 Tip: To get the YouTube "video thumbnails," I copied the name of each YouTube video and used a Google image search. I then saved the YouTube thumbnail images to my images folder and imported them into my data file.Incorporating the YouTube component into my project involves utilizing the LargeCardContent component. By adding a youtubeId prop and implementing conditional logic, I ensure the YouTube component is displayed only when a valid youtubeId is provided.Given that the LargeCardContent component is also utilized for content unrelated to videos, I've implemented conditional logic to add or remove a 'ctn-youtube' class. This ensures the layout remains consistent, regardless of whether the content includes a YouTube video or not.My Menu component renders HTML buttons for each category in my data file. Since I added the YouTube category, it was initially rendered unintentionally.To exclude the newly added YouTube category from my Menu component, I added a filter as follows:The "handleVideoClick" function is designed to update the application's state to reflect the selected YouTube video category. When a user clicks on the "VIDEO" button, this function is triggered, setting the selectedCategory state to the YouTube category from your categories object. This action causes the app to re-render and display YouTube video content based on the newly selected category, allowing users to interact with and view the YouTube videos associated with that category.Initially, I wrote this function twice, once in the Navbar component and once in the Hamburger menu component. So, thinking about clean code practices, I consulted my AI assistant Rix to see if I could create a separate file for this function, including what to name it, where to put it, and what kind of file it should be. And I must say, refactoring it was not as easy as I thought, and it created more questions!Refactoring questions:Why create a helper.js file instead of a helper.jsx file?If I'm passing props as a value, why does it work in JavaScript?If I'm moving the handleVideoClick function into the helper.js file, why not also the handleClick function?Why use an anonymous function with the handleVideoClick function and not the handleClick?In refactoring my code to follow best coding practices, my AI assistant told me to create a JavaScript file named helper.js and move my handleVideoClick function there. But why a JavaScript file and not a JSX file? Although the JavaScript file seems out of place in a React project to me, my AI assistant explains that it is common. So, at this point, I will just take the AI's word for it.So now I have a JavaScript file with a function named handleVideoClick that takes two parameters, categories and setSelectedCategory. But aren't these parameters actually props in my React project?So, when I asked my AI assistant if categories and setSelectedCategory are parameters or props, here is the explanation I received:"In the context of your project,categoriesandsetSelectedCategoryserve dual roles as both props and parameters, depending on where and how they are used. When passed into your components (Navbar,HamburgerMenu) through their props, they are indeed considered props. These props are objects that your components receive from their parent components in the React tree.""When you usecategoriesandsetSelectedCategoryinside thehandleVideoClickfunction, they are parameters of that function. This function is defined to accept an object that destructures intocategoriesandsetSelectedCategory. So, in this specific context within thehandleVideoClickfunction, they are parameters.""The distinction comes from their usage: in the components, they are props because they are passed into the components by their parents. In thehandleVideoClickfunction, they are parameters because they are inputs to the function when it is called*."*So now that I created a helper.js file for my functions, why can't I move my handleClick function into it? In this case, this is a boolean function that directly manipulates the state of my component. Here is the AI's detailed explanation:"ThehandleClickfunction directly manipulates the state of theHamburgerMenucomponent by toggling theisActivestate. Since this state is internal to theHamburgerMenucomponent and directly influences its behavior and presentation (such as showing or hiding the dropdown menu), it's essential forhandleClickto remain within the component. Moving it to a separate utility file likehelper.jswould abstract away the direct manipulation of the component's state, making the component's logic less clear and potentially complicating the state management. Furthermore, React's useState hook, which provides theisActivestate and its setter functionsetIsActive, is designed to be used within the body of a functional component, not outside in separate utility files."To open up my hamburger menu, I have an onclick event that triggers my handleClick boolean function. As you can see in the code block below, I directly assign handleClick for it to work.But to get my handleVideoClick function to work as expected, I can not directly assign it; it needs an anonymous function to assign it.So once again, so that I can better understand why and how this works, I conversed with my AI assistant as follows:My Question: It looks like I'm using an anonymous function to call an imported function. Can I remove the anonymous function and just use the imported function like this: onClick={handleVideoClick({ categories, setSelectedCategory })}AI Answer: No, you should not directly invoke the handleVideoClick function like that in the onClick attribute because it will be executed immediately when the component renders, not when the button is clicked. Keeping the anonymous function to wrap the call to handleVideoClick ensures that the function is called only in response to the click event.My Question: But they are both using onClick events. So I'm still confused.AI Answer: The key difference lies in how the functions are defined and used. In the case of handleClick, it is a function directly defined within the same component, so passing it as onClick={handleClick} sets it up to be called when the event occurs. This is a direct reference to the function.For handleVideoClick, you are attempting to pass it arguments ({ categories, setSelectedCategory }). If you were to write onClick={handleVideoClick({ categories, setSelectedCategory })}, it would call handleVideoClick immediately upon rendering, not upon the click event. By wrapping it in an anonymous function () => handleVideoClick({ categories, setSelectedCategory }), you ensure that handleVideoClick is called with the specified arguments only when the click event occurs, not at the time of rendering.Here are the links to the project:GitHub repoNetlify deployed projectLearn to Use Component Identifiers as Props for Rendering Various HTML Elements DynamicallyA Guide to Better Code Organization in React through File SeparationBuilding a Dropdown Menuin React: A Step-by-Step GuideDeveloping a Dynamic Hamburger Menu in React: A Step-by-Step GuideAdding YouTube videos to your React projects is easy with the React YouTube library. Simply install the library, add the YouTube component along with the YouTube ID to the video you want, and you're done!If you want to use more robust features, the React YouTube Library enhances the functionality and appearance of embedded YouTube videos in React applications with the opts object. This feature offers a wide range of customizable options following the YouTube IFrame Player API specifications for a tailored viewing experience.For my Star Wars React Ahsoka project, incorporating YouTube videos presented challenges, such as ensuring the YouTube category was excluded from the Menu component and effectively utilizing the handleVideoClick function. These issues were resolved by applying a filter to exclude the YouTube category from rendering in the Menu and by refactoring the handleVideoClick function into a separate JavaScript file for cleaner code and better reusability across components. Additionally, understanding the distinction between props and parameters and the use of anonymous functions for event handling was key to integrating the React YouTube library effectively.The React YouTube library is a great option for adding YouTube videos to your React projects. Plus, if you need assistance integrating it, consulting AI can provide the coding help you need and explain why and how the code works, ultimately making you a better React developer!Templates let you quickly answer FAQs or store snippets for re-use.        Are you sure you want to hide this comment? It will become hidden in your post, but will still be visible via the comment's permalink.      Hide child comments as well                  Confirm              For further actions, you may consider blocking this person and/or reporting abuse              Sebastian Korotkiewicz - Feb 6                          Mat - Feb 25                          Karen Payne - Feb 24                          Clifton Beale - Feb 1                  DEV Community — A constructive and inclusive social network for software developers. With you every step of your journey.    Built on Forem — the open source software that powers DEV and other inclusive communities.Made with love and Ruby on Rails. DEV Community © 2016 - 2024.          We're a place where coders share, stay up-to-date and grow their careers.

How to Integrate YouTube Videos into React Applications. Here are the links to the project:GitHub repoNetlify deployed projectLearn to Use Component Identifiers as Props for Rendering Various HTML Elements DynamicallyA Guide to Better Code Organization in React through File SeparationBuilding a Dropdown Menuin React: A Step-by-Step GuideDeveloping a Dynamic Hamburger Menu in React: A Step-by-Step GuideAdding YouTube videos to your React projects is easy with the React YouTube library.