Mastering Async Await in JavaScript for Cleaner Code

𝗧𝗶𝗽𝘀 𝗳𝗼𝗿 𝗪𝗿𝗶𝘁𝗶𝗻𝗴 𝗕𝗲𝘁𝘁𝗲𝗿 𝗖𝗼𝗱𝗲 𝗳𝗮𝘀𝘁 You're stuck with JavaScript errors. You see "Cannot read property" errors. This happens when your code expects something to exist, but it does not. TypeScript can help you avoid these errors. TypeScript is like a safety net for your code. It checks for bugs before you run your code. Here's what it does: - Tells you when you're accessing properties that do not exist - Helps with autocompleting your objects - Documents your code through types - Helps you refactor your code without fear To get started with TypeScript, you need: - Cheatsheets for syntax - The handbook to get oriented - A solid grasp of tsconfig.json Start with a small project and use strict mode. You will learn more from one strict project than from ten tutorials. Let's look at an example: fetching and displaying a user. We can define a User interface with id, name, and email. Then we can use this interface to fetch a user. TypeScript will catch typos and help with autocompleting. But we need to handle edge cases. We can use optional chaining to safely access properties. We can also use type guards to validate the API response at runtime. Some popular frameworks for TypeScript are: - Next.js / React with Zod or Valibot - NestJS with class-validator and class-transformer Remember to: - Use explicit interfaces - Check for null and undefined - Use union types for all states - Validate API responses at runtime Source: https://lnkd.in/g3KQZXbV

Recently, I revisited one JavaScript concept that has confused me more than once: the this keyword 🤯 I knew what this was supposed to represent, but in real projects, it often didn’t behave the way I expected. Sometimes it worked ✅, sometimes it returned undefined ❌, and sometimes it pointed somewhere completely unexpected 😅 While digging deeper, I finally understood how call, apply, and bind actually give us control over this 🔧 Here’s what clicked for me 👇 1️⃣ call() lets you invoke a function immediately and explicitly tell it what this should be. 2️⃣ apply() does the same thing, but expects the arguments as an array 📦 3️⃣ bind() doesn’t execute the function right away — instead, it returns a new function where this is permanently fixed 🔒 Once I understood this difference, a lot of JavaScript behavior started to feel predictable instead of magical ✨➡️📐 To make sure I really internalized it, I wrote a short blog using a simple real-world example and practical code snippets 🧠💻 Sharing it here in case it helps someone else who’s wrestling with this 👇 🔗 https://lnkd.in/gDXMqP8m Hitesh Choudhary Piyush Garg Chai Aur Code Akshay Saini 🚀 #JavaScript #LearningInPublic #WebDevelopment #CallApplyBind #ThisKeyword #Frontend

So, you're writing JavaScript code across multiple files - it's a mess. Three files, to be exact: user.js, admin.js, and main.js. It's simple. You've got variables flying around, and they're all overwriting each other - not good. This happens because, by default, you're loading scripts into the global scope, which is like trying to have a conversation in a loud bar - everything gets lost in the noise. To fix this, you need to think about Modules - they're like little containers that keep your code organized. You enable Modules by adding type="module" to your script tag, like this: <script type="module" src="main.js"></script>. And just like that, you've got three strict rules in place: - File-Level Scope, which means variables aren't global by default - they're more like secrets shared among friends. - Strict Mode, which is like having a code reviewer who's always on your case - it's a good thing, trust me. - Deferred Execution, which means your code waits patiently until the HTML is parsed - it's like waiting for your coffee to brew before you start your day. Think of a Module like a private club - nothing gets in or out unless you explicitly allow it. You export what you want to share, and you import what you need - it's like trading secrets with your friends. And when you import a Module, you get a Live Reference, which is like having a direct hotline to the variable inside the Module - if something changes, you'll know instantly. Modules are also Singletons, which means the Engine evaluates them only once, and every subsequent import is like getting a reference to the same old friend - you're not starting from scratch every time. Using Modules gives you boundaries, and that's a beautiful thing - you can build complex systems without everything collapsing into the global scope. It's like having a clean and organized desk - you can focus on what matters. Source: https://lnkd.in/gD78hVjr #JavaScript #Modules #CodingBestPractices

So promises in JavaScript are a big deal. They're essential. You gotta handle asynchronous operations - think API calls, file reading, that kind of thing. And JavaScript's got your back, it can definitely do that. But before promises, things were a bit messy, to be honest. Callbacks were the way to go, but they led to this whole "Callback Hell" situation - you know, where your code starts to look like a tangled mess. It's like trying to have a conversation with someone who keeps interrupting you, and you're like, "wait, what were we talking about again?" Promises changed the game, though. They make things way cleaner, with better error handling, and you can chain operations together - it's like a breath of fresh air. A promise can be in one of three states: pending, fulfilled, or rejected. Pending is like waiting for your coffee to brew - you're not sure if it's gonna be good or not. Fulfilled is like, yeah, your coffee's ready, and it's amazing. Rejected is like, oh no, the coffee machine's broken. Once a promise is fulfilled or rejected, it's settled - like, the coffee's either in your cup or it's not. You can use .then() and .catch() to handle success and error - it's like having a plan for when things go right or wrong. And the best part? Promises can be chained, so you can perform multiple async tasks without losing your mind. This helps you avoid callback hell, and your code's way more readable - it's like the difference between a messy room and a tidy one. Check out this article for more info: https://lnkd.in/g-s7f_8a #JavaScript #Promises #AsyncOperations

If you work with JavaScript, you know how often you forget small but important details. I put together a complete JavaScript quick reference guide that covers: – fundamentals – arrays & objects – async / await – DOM manipulation – advanced concepts with real examples It’s meant to be bookmarked and reused. Read here: https://lnkd.in/gNun7kxB

Hoisting in JavaScript can be confusing at first, but it doesn't have to be. It's often described improperly, which only adds to the confusion. In this post, I try to help shed some light on what hoisting actually is. #javascript #hoisting #coding #developer https://lnkd.in/gs2a7y3B

So, keywords are a big deal in JavaScript. They're like the secret language that JavaScript uses to get things done. You can't just use them for anything, or it's like trying to sit at a table that's already reserved for someone else - it's just not gonna work. Think about it, when you're coding, you're basically giving the computer a set of instructions, and keywords are like the commands that make it all happen. For instance, you useconst to create a constant value, like a fixed price that never changes - it's like setting a price tag that says "this is what it costs, no negotiations." And then there's "let", which creates a variable, like a price that can fluctuate based on demand - it's like a price tag that says "make an offer." And don't even get me started on decision making - that's where "if" and "else" come in, like a flowchart that helps the computer figure out what to do next. It's like, "if it's sunny, then go to the beach, else stay home and watch Netflix." Some other key keywords to keep in mind: - "function" creates a block of code that can be used again and again, like a recipe that you can follow to make your favorite dish. - "return" gives the result of a function, like the final answer to a math problem. The thing is, these keywords can be a bit tricky to use, and they can behave differently in different situations - it's like trying to navigate a maze, you gotta know the right turns to take. So, use them carefully, and make sure you understand how they work. Check out this article for more info: https://lnkd.in/d4s9vnnv #JavaScript #Coding #WebDevelopment

Day 11: Callback Functions in JavaScript JavaScript is single-threaded… so how does it handle async tasks? 🤔 The answer starts with Callbacks. 🔹 What is a Callback? A callback function is a function that is: ✅ Passed as an argument to another function ✅ Executed later 🔹 Basic Example function greet(name) { console.log("Hello " + name); } function processUser(callback) { const name = "Shiv"; callback(name); } processUser(greet); Here, greet is a callback function. 🔹 Async Example setTimeout(function() { console.log("Executed after 2 seconds"); }, 2000); 👉 The function runs after a delay 👉 JavaScript does not block execution 🔥 Why Callbacks Are Important ✔️ Foundation of async JavaScript ✔️ Used in APIs, event listeners, timers ✔️ Core concept before learning Promises ⚠️ The Problem: Callback Hell When callbacks are nested too much: api1(function() { api2(function() { api3(function() { console.log("Done"); }); }); }); This leads to: ❌ Hard-to-read code ❌ Pyramid structure ❌ Difficult debugging This problem was later solved using Promises and Async/Await. #Javascript #CallBack #webdevelopment #LearnInPublic

🚀 Why Akshay Saini’s JavaScript Playlist is a Game Changer If you really want to understand JavaScript from the inside, not just write code that somehow works, then Akshay Saini’s JavaScript playlist is hands down one of the best resources out there. What makes this playlist special is not what he teaches, but how he teaches it. 🧠✨ 🔹 Execution Context — explained the right way He breaks down how JavaScript actually runs your code by explaining the Global Execution Context, the Memory Creation Phase, and the Execution Phase. Once you understand this, JavaScript stops feeling confusing and starts feeling logical. 🔹 Hoisting — not a trick, but a concept Instead of calling hoisting a “weird JS behavior”, he defines it properly: 👉 Before the code is executed, memory is allocated to variables and functions. That single explanation clears years of confusion around hoisting. 🔹 Call Stack — visual and intuitive Function calls are no longer mysterious. You clearly see how every function creates its own Local Execution Context, how it gets pushed onto the Call Stack, and how it is removed after execution. This is where debugging skills level up 📈 🔹 Functions create their own world A function call is not just a line of code — it creates an entirely new execution environment with its own variables, scope, and references. After watching this playlist: ✅ JavaScript fundamentals become rock solid ✅ Interviews start making sense ✅ Console errors feel less scary ✅ Confidence in JS increases massively 💪 This is not just a tutorial series. It’s a mindset shift in how you think about JavaScript.

🧠 Call Stack, Queues & Task Types — The Foundation of Async JavaScript To understand async behavior in Node.js, you need to know four core parts: • Call Stack • Callback Queue • Microtask Queue • Macrotask Queue Let’s break them down simply. 📍 Call Stack — Where code executes The Call Stack is where JavaScript runs functions. It follows one rule: 👉 Last In, First Out (LIFO) Example: function one() { two(); } function two() { console.log("Hello"); } one(); Execution: • one() pushed • two() pushed • console.log() runs • two() removed • one() removed If the stack is busy, nothing else can run. ⚡ Microtask Queue (Higher Priority) This queue is more important than the macrotask queue. Examples: • Promise.then() • queueMicrotask() • process.nextTick() (Node-specific) Microtasks run: 👉 Immediately after the stack becomes empty 👉 Before any macrotask runs 📬 Callback Queue (Macrotask Queue) This is where async callbacks wait. Examples: • setTimeout • setInterval • setImmediate These do NOT go to the stack directly. They wait in the Macrotask Queue. 🔄 Execution Order Rule Every cycle: 1️⃣ Run synchronous code (Call Stack) 2️⃣ Empty all microtasks 3️⃣ Run one macrotask 4️⃣ Repeat This priority system is why Promise callbacks run before setTimeout. 🎯 Key Insight JavaScript isn’t “randomly async”. It follows a strict priority system: Call Stack → Microtasks → Macrotasks #Nodejs #Javascript #Backenddevelopment #Webdevelopment #LearningByDoing