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Question: What will be the output of the following JavaScript code?

console.log(typeof null);
console.log(typeof undefined);
console.log(null == undefined);
console.log(null === undefined);

Options:

        
• A) object, undefined, true, false
        
• B) null, undefined, true, true
        
• C) object, undefined, false, false
        
• D) undefined, undefined, true, false
    

Correct Answer: A) object, undefined, true, false

Detailed Explanation:

        
•             typeof null returns "object":             This is a well-known legacy quirk in JavaScript. In the initial implementation of JavaScript, values were represented in type tags, and null had a type tag of 0 (corresponding to an object reference), causing typeof to return "object".         
        
•             typeof undefined returns "undefined":             The type of an unassigned or undefined variable is strictly its own primitive type, which is "undefined".         
        
•             null == undefined evaluates to true:             When using the loose equality operator (==), JavaScript performs type coercion. According to the ECMAScript specification, null and undefined are considered loosely equal to each other and nothing else.         
        
•             null === undefined evaluates to false:             The strict equality operator (===) checks both the value and the type without performing type coercion. Since null (type: object/null) and undefined (type: undefined) belong to different types, the result is false.