JavaScript Interview Preparation: let, const, and var

In this article, we’ll dive into the differences between let, const, and var in JavaScript and cover many important problems based on block scope and function scope also explore best practices for their usage.

Read the full article it will definitely help you in your JavaScript interview.

When working with JavaScript, you’ll frequently encounter three keywords for declaring variables: let, const, and var. Each of these has a distinct purpose and scope, and understanding when and how to use them is essential for writing clean and maintainable code.

Points related to var variables:

1. Function Scope: Variables declared with var are function-scoped, which means they are accessible within the function in which they are defined.
2. Hoisting: Declarations made with var are hoisted to the top of their containing function or global scope. This means you can use a variable before it's declared, but it will be undefined until the declaration is reached in the code.
3. No Block Scope: Unlike let and const, variables declared with var do not have block scope. They are visible throughout the entire function, even if they are defined within a block (such as an if statement).
4. Global Scope: If a var…