Preventing Scope Leaks with JavaScript's Let

Unpopular opinion: "Performance" is a feature, not an afterthought. Most devs wait until the site feels "heavy" to start optimizing. By then, your bounce rate has already spiked. I wanted to make the technical side of speed easier to digest, so I built a checklist with the exact benchmarks you should be hitting in 2026 Whether you're a junior dev or a senior architect, this should be in your bookmarks. 🔖 Link: https://lnkd.in/eq_Np6JJ #WebDesign #Programming #TechTips #JavaScript

Revisiting the JavaScript DOM (Document Object Model) today to strengthen my fundamentals. Sometimes the best way to move forward in development is to go back and revise the basics. While revising, I focused on: • What the DOM actually is • The core pillars of DOM manipulation • Handling multiple events • Selecting multiple elements efficiently • Using setTimeout and setInterval • Building small interactive examples Every time I revisit these concepts, I discover something new and deepen my understanding of how JavaScript interacts with the browser. Small steps every day toward becoming a better developer. 🚀 #javascript #dom #webdevelopment #frontenddevelopment #codingjourney #100daysofcode #programming #developerlife #learninginpublic

Predict the output: function test() { console.log(a); var a = 10; } test(); Output: undefined Why? Because of hoisting. JavaScript rewrites it internally as: function test() { var a; console.log(a); a = 10; } Only declaration is hoisted. Not initialization. Now try with let: function test() { console.log(a); let a = 10; } This throws an error. Because let has temporal dead zone. Understanding hoisting prevents subtle bugs. #javascript #frontend #webdevelopment #programming

JavaScript Lexical Scoping and Scope Chain.............................. This diagram demonstrates how lexical scoping works in JavaScript. A variable declared in the global scope is accessible throughout the entire program. Inside the outer() function, outerVar is limited to that function and any blocks nested within it. The if statement creates a new block scope containing level1, which is only accessible inside that block and its child blocks. A deeper nested block defines level2, which can access its own variable as well as level1, outerVar, and globalVar. JavaScript resolves variables by searching outward through parent scopes, forming the scope chain. #javascript #lexicalscope #scopechain #globalscope #functionscope #blockscope #let #const #variables #programming #webdevelopment #frontend #coding #softwaredevelopment #jsconcepts

JavaScript does NOT use classical inheritance. It uses Prototype inheritance. Example: function Person(name) { this.name = name; } Person.prototype.sayHi = function() { console.log("Hi " + this.name); }; const p1 = new Person("Prakhar"); p1.sayHi(); How it works: JavaScript creates empty object Links it to Person.prototype Assigns this Returns object If property not found on object, JavaScript looks up the prototype chain. This is how inheritance works internally. Understanding prototypes makes debugging easier. #javascript #webdevelopment #frontend #programming

Day 2- of Leetcode 30 days of javascript. Problem 2620 The problem statement was to return a function inside a parent function, and when the parent function is called, it should return in subsequent ascending +1 result. i,e n, n+1, n+2 for any value of n. This problem was based on closures and lexical scope of higher ordered function. There are many approach for this problem but I tried by setting a counter n - 1 and then incrementing it by 1, ie counter += 1. I am open to advice and please comment on how can I improve. #Leetcode #coding #javascript #Logic #growth #programming #higherorderfunction #closures #lexicalscope #scope

Mastering JavaScript Closures: A Comprehensive Guide with Practical Examples JavaScript closures are a fundamental concept that allows a function to remember and access its lexical scope even when it's executed outside that scope. This tutorial demystifies closures, explaining their mechanics, practical applications, and how they empower powerful design patterns in your JavaScript code. Read the full article 👇 https://lnkd.in/gK4b6gvw #Technology #Programming #WebDevelopment #SoftwareEngineering #Coding #JavaScript #JSClosures #JavaScriptClosures #FunctionalProgramming #FrontendDevelopment #FutureOfWork #DigitalTransformation

Instead of just using .map(), I tried implementing it myself using Array.prototype polyfills to understand how it actually works internally. The idea is simple: Loop through the array Run a callback on each element Store the returned value in a new array Return the new array at the end Small exercise, but it really helps understand what JavaScript is doing behind the scenes when we call built in methods. Sometimes writing things from scratch teaches more than just using the method. Hitesh Choudhary Chai Aur Code Akash Kadlag Jay Kadlag #javascript #webdevelopment #frontenddevelopment #learninginpublic #coding #chaiaurcode

Predict the output: console.log(typeof null); Answer: object This is a historical bug in JavaScript. It exists because of how early JavaScript stored type tags in memory. null was incorrectly tagged as object. This behavior cannot be fixed now due to backward compatibility. JavaScript has many such interesting edge cases. Understanding internals makes you a better engineer. #javascript #webdevelopment #frontend #softwareengineering #datastructures #algorithms #programming #frontenddeveloper

Built an efficient JavaScript solution to find the maximum and second maximum elements in an array using a single pass approach, optimizing performance with O(n) time complexity and constant space. #JavaScript #DSA #Coding #LeetCode #WebDevelopment