Let vs Const: Best Practices in JavaScript

What are the main differences between let and const in JavaScript?

The main difference is that 'let' allows you to reassign variables, while 'const' creates a constant reference that cannot be reassigned.

When should I use let instead of const?

Use 'let' when you expect the variable's value to change, such as in loops or conditionals. Use 'const' for values that should remain constant.

Are there any performance implications of using let vs const?

Generally, there are no significant performance differences. The choice should be based on the intended use of the variable.

Can you give an example of when to use each?

Sure! Use 'const' for a configuration object that won't change, and 'let' for a counter variable in a loop.