What is the difference between let and const in JavaScript?

What is the difference between let and const in JavaScript?

In JavaScript, 'let' allows you to declare variables that can be reassigned, while 'const' is for variables that cannot be reassigned after their initial assignment.

Can you give me an example of using let?

Sure! Here's an example:

let x = 10;
x = 20; // This is valid because 'x' is declared with 'let'

And what about const?

Here's an example of 'const':

const y = 30;
y = 40; // This will throw an error because 'y' cannot be reassigned

When should I use let instead of const?

You should use 'let' when you expect the variable's value to change, and 'const' when you want to ensure the variable remains constant.