What is 'null' in Javascript

• In JavaScript, null is a primitive data type that represents the intentional absence of any object value. It is typically used to indicate that a variable or property has no value or is intentionally empty.

• Here's an example of a variable that is assigned null:

    

    let foo = null;

    console.log(foo); // Output: null

• In this example, the foo variable is assigned the value null explicitly.

• null is often used to indicate that an object or property doesn't exist, or to clear a variable that previously held an object or value. For example, we can use null to clear the value of an object property:

    let person = {

        name: 'John',

        age: 30

    };

    person.age = null;

    console.log(person); // Output: { name: 'John', age: null }

• In this example, we're setting the age property of the person object to null, indicating that we intentionally want the property to have no value.

• It's important to note that null is not the same as undefined. undefined represents the absence of a value or the lack of definition, while null represents the intentional absence of any object value.

• Overall, null is a primitive data type in JavaScript that represents the intentional absence of any object value. It's commonly used to indicate that an object or property has no value, or to clear a variable that previously held an object or value.