What is the purpose of using 'const' in JavaScript?

What is the purpose of using 'const' in JavaScript?

The 'const' keyword is used to declare variables that are block-scoped and cannot be reassigned. It helps in maintaining immutability.

Can you give me an example of how to use 'const'?

Sure! Here's an example:

const pi = 3.14;
console.log(pi);

In this case, 'pi' cannot be reassigned to a different value.

What happens if I try to reassign a 'const' variable?

If you try to reassign a 'const' variable, JavaScript will throw a TypeError. For example:

const x = 10;
x = 20; // This will cause an error.

Are there any exceptions to using 'const'?

Yes, while 'const' prevents reassignment, it does not make objects immutable. You can still modify properties of a 'const' object.