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 x = null; For 'undefined', you could declare a variable without assigning it: let y; console.log(y); // This will log 'undefined'.

Are there any situations where they can be used interchangeably?

While they are different, in some cases, like conditionals, both can evaluate to false. However, it's best to use them according to their intended purpose.

How do they behave in comparisons?

In loose equality (==), null and undefined are considered equal. However, in strict equality (===), they are not equal to each other or to any other value.