When should I use const or let in JavaScript?

Can you explain when to use const or let in JavaScript?

Sure! In JavaScript, use 'const' for variables that won't be reassigned, and 'let' for those that might change.

What happens if I try to reassign a const variable?

If you try to reassign a const variable, you'll get a TypeError. It's meant to be a constant reference.

Are there any cases where I should avoid using const?

You should avoid using const when you need to reassign a variable, like in loops or when the value changes.

Can I use var instead of let or const?

Yes, but 'var' has function scope and can lead to unexpected behavior. It's generally better to use 'let' or 'const'.