Mocking Dependencies in JavaScript Tests with Jest

😍Complete Guide to JavaScript Promises, Async/await and Promise Methods😍 𝗙𝗼𝗿 𝗺𝗼𝗿𝗲 𝘀𝘂𝗰𝗵 𝘂𝘀𝗲𝗳𝘂𝗹 𝗰𝗼𝗻𝘁𝗲𝗻𝘁, 𝗱𝗼𝗻'𝘁 𝗳𝗼𝗿𝗴𝗲𝘁 𝘁𝗼 𝗳𝗼𝗹𝗹𝗼𝘄 Muhammad Nouman 𝗺𝗲. #javascript #reactjs #nextjs #webdevelopment

💡How to access keys, values and key-value pairs from object in JavaScript💡 𝗙𝗼𝗿 𝗺𝗼𝗿𝗲 𝘀𝘂𝗰𝗵 𝘂𝘀𝗲𝗳𝘂𝗹 𝗰𝗼𝗻𝘁𝗲𝗻𝘁, 𝗱𝗼𝗻'𝘁 𝗳𝗼𝗿𝗴𝗲𝘁 𝘁𝗼 𝗳𝗼𝗹𝗹𝗼𝘄 𝗺𝗲. #javascript #reactjs #nextjs #webdevelopment

🚀 Iterators and Generators (JavaScript) Iterators provide a standardized way to access elements of a collection sequentially. Generators are special functions that can be paused and resumed, allowing you to create iterators easily. Generators use the `yield` keyword to return values one at a time. Iterators and generators are fundamental to the `for...of` loop and other iterable-based features. #JavaScript #WebDev #Frontend #JS #professional #career #development

⚡ Most developers accidentally make async JavaScript slower than it needs to be. A lot of people write async code like this: await first request wait… await second request wait… await third request It works. But if those requests are independent, you’re wasting time. The better approach: ✅ run them in parallel with Promise.all() That small change can make your code feel much faster without changing the feature at all. Simple rule: If task B depends on task A → use sequential await If tasks are independent → use Promise.all() This is one of those JavaScript habits that instantly makes you look more senior 👀 Join 3,000+ developers on my Substack: 👉 https://lnkd.in/dTdunXEJ How often do you see this mistake in real codebases? #JavaScript #WebDevelopment #Frontend #SoftwareEngineering #AsyncJavaScript #Promises #CodingTips #Developers #LearnToCode #AITechDaily

🚀 Prototypal Inheritance (JavaScript) JavaScript uses prototypal inheritance, a mechanism where objects inherit properties and methods from other objects. Every object has a prototype, which is another object. When a property is accessed on an object, JavaScript first checks if the object itself has the property. If not, it looks up the prototype chain until the property is found or the end of the chain is reached. This allows for code reuse and creating hierarchies of objects. Understanding prototypes is essential for building complex object-oriented applications in JavaScript. The `__proto__` property (deprecated but still often seen) and the `Object.getPrototypeOf()` method are used to access an object's prototype. #JavaScript #WebDev #Frontend #JS #professional #career #development

𝗣𝗹𝗮𝘆𝘄𝗿𝗶𝗴𝗵𝘁 𝘄𝗶𝘁𝗵 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 & 𝗧𝘆𝗽𝗲𝗦𝗰𝗿𝗶𝗽𝘁 – 𝗗𝗮𝘆 𝟴 𝗝𝘂𝗺𝗽𝗶𝗻𝗴 𝗦𝘁𝗮𝘁𝗲𝗺𝗲𝗻𝘁𝘀 Jumping statements are control statements that immediately change the normal flow of program execution. they jump from one place in the code to another place. 𝟭. 𝗕𝗿𝗲𝗮𝗸 used to break the loop intentionally, when a specific condition is met.  𝗯𝗿𝗲𝗮𝗸; 𝟮. 𝗖𝗼𝗻𝘁𝗶𝗻𝘂𝗲 used to skip the current iteration and move to the next iteration when a specific condition is met 𝗰𝗼𝗻𝘁𝗶𝗻𝘂𝗲; 𝟯. 𝗥𝗲𝘁𝘂𝗿𝗻 return exists a function and optionally send a value back to the caller ex: function add(a:number, b:number) : number{ 𝗿𝗲𝘁𝘂𝗿𝗻 a+b; } 𝟰. 𝗧𝗵𝗿𝗼𝘄 throw stops program execution by throwing an error. ex: function withdraw(amount:number){ if(amount<=0){ 𝘁𝗵𝗿𝗼𝘄 new Error ("Invalid Amount") } Follow me for regular insights on 𝗣𝗹𝗮𝘆𝘄𝗿𝗶𝗴𝗵𝘁 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 𝗧𝗲𝘀𝘁𝗶𝗻𝗴. #JavaScript #TypeScript #NodeJS #Playwright #AutomationTesting #SoftwareTesting #QA #LearningInPublic #TestAutomation

🚫 Do Not Overuse <div> in React When working with HTML, we often use <div> to wrap multiple elements. But in React, unnecessary <div> elements can create extra nodes in the DOM. 💡 React introduced Fragments (React 16.2) to solve this problem. Why use React Fragments? • No extra DOM nodes • Cleaner and less cluttered DOM • Slightly better performance • Easy way to group multiple elements React also provides a Fragment shorthand (<> </>) which makes code cleaner and easier to write. 📌 I’ve explained this concept in a simple swipe PDF for beginners. #React #ReactJS #JavaScript #FrontendDevelopment #WebDevelopment #MohitDecodes

🚀 First-Class Functions (JavaScript) In JavaScript, functions are first-class citizens, meaning they can be treated like any other variable. They can be assigned to variables, passed as arguments to other functions, and returned as values from other functions. This allows for powerful abstractions and code reuse, enabling techniques like higher-order functions and function composition. #JavaScript #WebDev #Frontend #JS #professional #career #development

Stop watching JavaScript tutorials. ❌ Start practicing JavaScript where it actually makes you think.✅ Most beginners don’t fail at JS because it’s hard — They fail because they don’t know where to practice it properly. Master JS by solving, building, breaking, and fixing — not just watching. 🚀 🔖 Save this post & find the list below 👇 Follow me: - Parthib M. 🐺 to explore more updates on Web Development. #SoftwareEnginner #webdeveloper #frontend #backend #javascript #reactjs #fullstack #interviewpreparation

🧠 JavaScript Concept: Promise vs Async/Await Handling asynchronous code is a core part of JavaScript development. Two common approaches are Promises and Async/Await. 🔹 Promise Uses ".then()" and ".catch()" for handling async operations. Example: fetchData() .then(data => console.log(data)) .catch(err => console.error(err)) 🔹 Async/Await Built on top of Promises, but provides a cleaner and more readable syntax. Example: async function getData() { try { const data = await fetchData(); console.log(data); } catch (err) { console.error(err); } } 📌 Key Difference: Promise → Chain-based handling Async/Await → Synchronous-like readable code 📌 Best Practice: Use async/await for better readability and maintainability in most cases. #javascript #frontenddevelopment #reactjs #webdevelopment #coding