When should I use let instead of var in JavaScript?

When should I use let instead of var in JavaScript?

You should use let when you need block scope and var when you need function scope. Let is generally preferred.

Can you explain what block scope means?

Block scope means that the variable is only accessible within the block it is defined, like inside a loop or an if statement.

What are the downsides of using var?

Using var can lead to issues like hoisting and unexpected behavior due to its function scope, which can cause bugs.

Is there any situation where var is still useful?

Var can be useful in older codebases or when you need to declare a variable that should be accessible throughout the function.