The value null is a primitive data type that represents the intentional absence of any object value. It is often assigned explicitly to a variable or property to indicate that it has no value or that it is intentionally empty. It is a value that is assigned by the programmer.
let variable = null; console.log(variable); // Output: null
The value undefined is a primitive data type that is automatically assigned to a variable or property when it has been declared but has not been assigned any value. It is the default value given to variables that have not been initialized.
let variable; console.log(variable); // Output: undefined
nullis an assignment value that represents the intentional absence of an object value, whereas
undefinedrepresents the absence of any assigned value.
- null is of type "object", while undefined is of type "undefined".
- When comparing null and undefined using strict equality (===), they are not considered equal because they are of different types.