What is the difference between null and undefined in JavaScript?

What is the difference between null and undefined in JavaScript?

In JavaScript, null is an intentional absence of any object value, while undefined means a variable has been declared but not assigned a value.

Can you give me an example of each?

Sure! For null, you might set a variable like this: let a = null;. For undefined, you could declare a variable without assigning it: let b;.

Are there any situations where I should use one over the other?

Use null when you want to explicitly indicate that a variable should have no value. Use undefined when a variable is declared but not yet assigned.

What happens if I try to use them in a comparison?

Using ==, null and undefined are considered equal. However, using ===, they are not equal because they are of different types.