What are the best practices for using const, let, and var in JavaScript?

What are the best practices for using const, let, and var in JavaScript?

It's best to use 'const' for variables that won't change, 'let' for those that will, and avoid 'var' due to its hoisting issues.

Can you explain why 'var' is not recommended?

Sure! 'Var' is function-scoped and can lead to unexpected behavior due to hoisting, making code harder to debug.

When should I use 'let' instead of 'const'?

Use 'let' when you need to reassign a variable, like in loops or conditionals, while 'const' is for immutable references.

Are there any exceptions to using 'const'?

Yes, you can use 'const' for objects and arrays, but you can still modify their properties or elements.

What about performance differences between them?

In most cases, the performance difference is negligible. Focus on readability and maintainability instead.