JavaScript has got more expressive - reduce vs Object.groupBy for group data. For years, we used reduce(), when we wanted to group data. It worked. It was powerful. But it wasn't always readable. → The old way with reduce() const grouped = users.reduce((acc, user) => { const key = user.role;   (acc[key] ||= []).push(user);   return acc; }, {}); recude() is a general-purpose accumulator. We used it for grouping because we didn't have native alternative. → The native Object.groupBy()approach. const grouped = Object.groupBy(users, user => user.role); Same result. Much clearer code. Now the code says exactly what it does. - Less boilerplate. - More declarative. - Easier for teams to maintain. → The real win This isn’t about fewer lines it’s about readability, consistency, and maintainability at scale. → Use: - groupBy() → for grouping - reduce() → for true aggregation / complex transformations Your future teammates will thank you. Have you started switching to Object.groupBy() yet? 👀 #JavaScript #CleanCode #WebDevelopment #DeveloperExperience #SoftwareEngineering

𝗧𝗵𝗲 𝗧𝗿𝗮𝗻𝗾𝗎𝗶𝗹 𝗪𝗼𝗿𝗹𝗱 𝗢𝗳 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 𝗔𝗿𝗿𝗮𝘆𝘀 𝗮𝗻𝗱 𝗢𝗯𝗷𝗲𝗰𝘁𝘀 You're a developer, and you need to store data. Do you use an array or an object? Here's what you need to know: - Arrays are ordered lists. - Objects give your data labels. Use an array when: - Order matters - Items are similar Use an object when: - Items are different - Need labels Examples: - List of student names: Array - One student's profile: Object - Weekly temperatures: Array - Weather Object In JavaScript, arrays are objects. Let's look at an example: let arr = ["a", "b", "c"]; JavaScript sees this as: { 0: "a", 1: "b", 2: "c", length: 3 } Destructuring lets you unpack values in one line. You can use it with arrays and objects. Example: let student = { name: "Arjun", age: 21 }; let { name, age } = student; console.log(name); // "Arjun" console.log(age); //

𝐖𝐡𝐚𝐭 𝐦𝐚𝐤𝐞𝐬 𝐚𝐧 𝐀𝐏𝐈 “𝐑𝐄𝐒𝐓𝐟𝐮𝐥”? Not every API that returns JSON is RESTful. REST is not about technology. It’s about design principles. Let’s simplify it 👇 𝟏. 𝐑𝐞𝐬𝐨𝐮𝐫𝐜𝐞𝐬 (Not actions) Your URLs should represent nouns. Good: → GET /notes   → DELETE /notes/5  Not: → GET /getNotes   → POST /deleteNote  APIs describe resources. HTTP methods describe actions. 𝟐. 𝐒𝐭𝐚𝐭𝐞𝐥𝐞𝐬𝐬 Each request must contain everything the server needs. → No hidden memory. → No dependency on previous calls. Every request stands on its own. That’s what makes systems scalable. 𝟑. 𝐑𝐞𝐩𝐫𝐞𝐬𝐞𝐧𝐭𝐚𝐭𝐢𝐨𝐧 (Usually JSON) The client and server exchange structured data. → Not HTML pages. → Not server-rendered views. Clean, predictable data structures. Here’s the simple formula: Resources → identified by URLs   Actions → defined by HTTP methods   State → not stored between requests  If your API follows these rules, it’s not just working ... 👉 It’s well designed. 𝐏𝐒: Next, I’ll show how I built a Notes API using in-memory storage and what breaks when multiple requests hit the server. Follow Fatima Hamid for simple, practical lessons that scale from UI to systems. . . . ➥ Tags: Mian Ahmad Basit #NodeJS #BackendDevelopment #APIDesign #WebDevelopment #SoftwareEngineering #RESTAPI #JavaScript #FullStackDeveloper

𝗧𝗵𝗲 𝗚𝗵𝗼𝘀𝘁 𝗶𝗻 𝗧𝗵𝗲 𝗠𝗮𝗰𝗵𝗶𝗻𝗲: 𝗔𝗻𝗼𝗻𝘆𝗺𝗼𝘂𝘀 𝗙𝘂𝗻𝗰𝘁𝗶𝗼𝗻𝘀 𝗶𝗻 𝗦𝘁𝗮𝗰𝗸 𝗧𝗿𝗮𝗰𝗲𝘀 You see a browser console error with a stack trace. It looks like a list of ghosts: - at <anonymous>:1:13 - at Array.map (<anonymous>) - at Object.onClick (index.js:42:10) The Stack Trace is your map to the crime scene. But when it's filled with "Anonymous Functions," it's hard to find the problem. In JavaScript, an anonymous function is a function without a name. They are created "on the fly" as values. - Traditional Expression: const login = function() { ... }; - Arrow Function: const logout = () => { ... }; When an error occurs, the JavaScript engine creates a Stack Trace. If your functions have names, the engine lists them. If they don't, it labels them <anonymous>. You can use Named Function Expressions (NFE) to fix this. Give the function an internal name totag it for the debugger. - const processPayments = function validateAndTax(amount) { ... }; Now you know which business logic triggered the error. - Use anonymous arrows for simple logic. - Always name your functions for complex logic. - Never use anonymous functions for recursion. Source: https://lnkd.in/gKUBY488

𝗧𝗵𝗲 𝗚𝗵𝗼𝘀𝘁 𝗶𝗻 𝗧𝗵𝗲 𝗠𝗮𝗰𝗵𝗶𝗻𝗲: 𝗔𝗻𝗼𝗻𝘆𝗺𝗼𝘂𝘀 𝗙𝘂𝗻𝗰𝘁𝗶𝗼𝗻𝘀 𝗶𝗻 𝗦𝘁𝗮𝗰𝗸 𝗧𝗿𝗮𝗰𝗲𝘀 You see a browser console error with a stack trace. It looks like a list of ghosts: - at <anonymous>:1:13 - at Array.map (<anonymous>) - at Object.onClick (index.js:42:10) The Stack Trace is your map to the crime scene. But when it's filled with "Anonymous Functions," it's hard to find the problem. In JavaScript, an anonymous function is a function without a name. They are created "on the fly" as values. - Traditional Expression: const login = function() { ... }; - Arrow Function: const logout = () => { ... }; When an error occurs, the JavaScript engine creates a Stack Trace. If your functions have names, the engine lists them. If they don't, it labels them <anonymous>. You can use Named Function Expressions (NFE) to fix this. Give the function an internal name totag it for the debugger. - const processPayments = function validateAndTax(amount) { ... }; Now you know which business logic triggered the error. - Use anonymous arrows for simple logic. - Always name your functions for complex logic. - Never use anonymous functions for recursion. Source: https://lnkd.in/gvt_jFRS

🛑 "Using Nested For-Loop" JavaScript has evolved significantly, but many of us still rely on outdated nested loops, a major bottleneck for performance optimization. If your code looks like the left side of this image, it’s time for an upgrade. Check out this quick breakdown of why nested loops are inefficient and how modern alternatives can revolutionize your data processing: 🔹 The "Don't": Standard nested loops create high overhead and are difficult for the browser to optimize and slow in querying database. They lead to slow code execution. 🔹 The "Do": Modern, clean alternatives like .forEach(), .map(), .filter(), and .reduce(). These methods are not only more readable but also leverage modern engine optimizations for massive speed boosts. Don't let legacy coding habits hold your application back. Embrace the efficiency of modern JavaScript. #JavaScript #CodingBestPractices #SoftwareEngineering

💡 **JavaScript Tip: map() vs filter() vs forEach()** These three array methods look similar but serve different purposes. 🔹 **map()** → Transforms every element and returns a **new array** 🔹 **filter()** → Selects elements that pass a **condition** and returns a **new array** 🔹 **forEach()** → Runs a function for each element but **does not return a new array** 👉 **Quick rule:** Use **map** to transform data, **filter** to select data, and **forEach** to simply loop through data. #JavaScript #WebDevelopment #Frontend #CodingTips

Do you know how Promise.all() works in JavaScript? The more I build, the more I realize how much there is to learn. Recently, I was working with Supabase as my database to store both default events and user-created events. I needed to fetch data from two tables and combine them. My initial approach looked like this: const { data } = await supabase.from("eventchosen_duplicate").select("*"); const { data: eventDefault } = await supabase.from("eventchosen").select("*"); setAllEvents([...data, ...eventDefault]); The issue here is that each await runs sequentially, meaning the second request waits for the first one to finish. A better approach is using Promise.all(): const [duplicateRes, defaultRes] = await Promise.all([ supabase.from("eventchosen_duplicate").select("*"), supabase.from("eventchosen").select("*"), ]); This runs both requests in parallel, improving performance. Small improvement, big lesson: Better async patterns lead to better performance. Still building. Still learning. #JavaScript #React #Supabase #WebDevelopment #FrontendDevelopment #learnInPublic

👋 Hello LinkedIn Network, Understanding data types is essential for writing reliable JavaScript applications. A data type defines the kind of value a variable holds. JavaScript uses data types to determine how operations should behave. The most commonly used data types include: 🔹 String – represents text values 🔹 Number – represents numeric values 🔹 Boolean – represents true or false Example: let name = "Arjun"; // String let age = 21; // Number let isStudent = true; // Boolean Why does this matter? Because JavaScript behaves differently depending on the data type. For instance: console.log(5 + 5); // 10 console.log("5" + "5"); // 55 Proper understanding of data types prevents logical errors and improves code quality. For developers starting their journey in web development, mastering data types is a foundational skill. #JavaScript #WebDevelopment #Programming #FrontendDevelopment #Coding #TechEducation #LearnToCode

𝗧𝘄𝗼 𝗧𝘆𝗽𝗲𝘀 𝗢𝗳 𝗥𝗲𝘁𝘂𝗿𝗻 𝗜𝗻 𝗔𝗿𝗿𝗼𝘄 𝗙𝘂𝗻𝗰𝗍𝗶𝗼𝗻𝘀 You work with arrow functions in JavaScript. You need to know how to return values. There are two ways: implicit return and explicit return. Implicit return works when your function has a single expression. The result is automatically returned. - You define a function with a single expression. - The result is returned without a return keyword. Example: const add = (a, b) => a + b. The result of a + b is returned. Explicit return is necessary when you have multiple operations or a block body. - You use the return keyword to return a value. - This is required when your function has multiple statements or a block body. Example: const setData = (prevData) => { return { ...prevData, content: 'lorem ipsum' }; }; You use implicit return for concise functions. You use explicit return for functions with multiple statements. Understanding both helps you write cleaner code. Source: https://lnkd.in/gGCAXd2k