JavaScript var let const: Scope and Reassignment

🧠 Day 10 of 21days challenge JavaScript call, apply, bind 🔥 They allow you to control what “this” refers to in a function. You can borrow functions and use them with different objects. For easy understanding :- call → pass arguments one by one apply → pass arguments as array bind → returns new function 👉 That’s how we control “this” in JavaScript This changed how I understand functions 🚀 #JavaScript #CallApplyBind #Frontend

❓ If variables are stored before execution… 👉 what happens when JavaScript sees a function? Does it also behave like var? #JavaScript #Frontend #WebDevelopment

🚀 💡 JavaScript Tricky Question Explanation const arr = [4, 10, 2, 8]; const result = arr.find(num => num > 5) + arr.findIndex(num => num > 5); console.log(result); 👉 Output: 11 👉 Explanation: * find() returns the first value > 5 → `10` * findIndex() returns its index → `1` * Final result → `10 + 1 = 11` ⚡ Both stop at the **first match** #JavaScript #WebDevelopment #Frontend #CodingInterview #JSConcepts

Day 106 / 365 👨💻 Continued with React practice. 🧩 Revisited component structure 🔁 Practiced state updates in small examples ⚙️ Improved code organization 🧠 Focused on getting comfortable with the flow #365DaysOfCode #React #JavaScript #Frontend

What is a closure in JavaScript? A closure is a function that remembers variables from its outer scope even after that scope has finished executing. Why does this work? - `createCounter` runs once - It creates a variable `count` - The inner function “closes over” that variable - Even after `createCounter` finishes, `count` is still accessible Each time `counter()` runs: → it uses the same preserved state 💡 Closures are everywhere: - React hooks - Event handlers - Memoization - Encapsulation patterns They’re not just a concept — they’re part of how JavaScript manages state. #Frontend #JavaScript #React #WebDevelopment #SoftwareEngineering

Day 107 / 365 👨💻 Focused on small improvements. 🧩 Refined a component structure 🔁 Managed state updates more clearly ⚙️ Simplified conditional rendering 🧠 Focused on writing cleaner React code #365DaysOfCode #React #JavaScript #Frontend

How to understand a Javascript function? What arguments are passed? Why it is passed? What is the function doing inside? What it is returning? What does the JS doing with the returned value? If you can answer to all the questions then you have understood a function. #Javascript #frontenddevelopement

Closures are one of those JavaScript concepts that feel confusing at first, but once you understand them, a lot of things start making sense. #javascript #frontend

Hoisting is a behavior in JavaScript where variable and function declarations are conceptually moved to the top of their containing scope (either the global script or a specific function) during the compilation phase, before the code is actually executed. It is important to understand that your code isn't physically moved anywhere. Instead, the JavaScript engine allocates memory for variable and function declarations before it executes the code line-by-line. #javascript #hoisting #frontend #scripting

Practicing JavaScript Strings with a simple hands-on project 💻 Built a couple of small projects,out of them one is here 🔹 Convert text to UPPERCASE & lowercase 🔹 Remove extra spaces 🔹 Replace specific words dynamically This helped me improve my understanding of: ✔ String methods ✔ Regular expressions for cleaning text ✔ DOM manipulation & event handling #JavaScript #WebDevelopment #Frontend #CodingPractice #LearningJourney