Apr 18, 2009 · Variables declared with let or const remain uninitialized at the beginning of execution while that variables declared with var are being initialized with a value of undefined.

Jul 11, 2025 · With the introduction of ES6 in 2015 two more keywords, let and const came into the picture. var and let are both used for variable declaration in javascript but the difference between …

Apr 24, 2025 · Understanding the differences between var, let, and const is essential for writing efficient and error-free JavaScript code. While var served well in the early days, the arrival of let and const …

In this tutorial, you will learn about the difference between let and var in JavaScript with the help of examples.

Jul 30, 2025 · JavaScript: var vs let vs const Key Differences and Best Practices In JavaScript, variables can be declared using var, let, or const. Each of these has different characteristics in...

Aug 20, 2025 · Understanding the difference between var, let, and const in JavaScript is crucial for writing clean, efficient, and bug-free code. In this article, we break down their scope, hoisting, …

Nov 24, 2025 · If you’re a frontend dev (especially React/Next.js), you must know the difference between var, let, and const — not just for interviews, but because they impact how your code behaves under …

Dec 19, 2024 · Variables declared with var are scoped to the nearest function - not the block where you declared them. If you declare them outside any function, they become global variables. This means …

These are important to understand to truly be able to tell the difference between let and var in JavaScript. In this guide, you learn what is the difference between var and let in JavaScript.

May 21, 2025 · Understand the differences between var, let, and const in JavaScript. Learn when to use each, how scoping works, and why modern developers prefer let and const.