What are the differences between var, let, and const in JavaScript?

Can you explain the differences between var, let, and const in JavaScript?

Sure! In JavaScript, 'var' is function-scoped, while 'let' and 'const' are block-scoped. This means 'let' and 'const' are limited to the block in which they are defined.

What about hoisting? How does it affect these declarations?

Great question! 'var' declarations are hoisted to the top of their function scope, meaning they can be used before they are declared. 'let' and 'const' are also hoisted, but they cannot be accessed until their declaration is reached, leading to a 'temporal dead zone'.

Can you give me an example of when to use each?

Absolutely! Use 'var' for variables that need to be accessible throughout a function. Use 'let' for variables that will change, and 'const' for constants that should not be reassigned.

What happens if I try to reassign a const variable?

If you try to reassign a 'const' variable, you'll get a TypeError. 'const' ensures that the variable reference cannot be changed.