What will be the output of console.log(jim.age) and console.log(jim.__proto__.age) given that the prototype age has been set to 29 and jim's age is 18?

What will be the output of console.log(jim.age) and console.log(jim.__proto__.age) given that the prototype age has been set to 29 and jim's age is 18?

• A. 18 and 29
• B. 29 and 18
• C. 29 and undefined
• D. undefined and 29

Answer: (A)

To determine the correct output when you execute `console.log(jim.age)` and `console.log(jim.__proto__.age)`, it's essential to understand how prototype inheritance works in JavaScript. When you call `console.log(jim.age)`, JavaScript will look for the `age` property directly on the `jim` object. Since `jim` has its own `age` property set to 18, it will log `18`. Next, when you execute `console.log(jim.__proto__.age)`, you're accessing the prototype of the `jim` object. Given that the prototype's `age` has been set to 29, the log will display `29`. This chain of property lookup—first checking on the object itself and then moving up to its prototype—explains why the output for the two console logs will be `18` followed by `29`, making the correct answer the first choice. The output sequence illustrates key concepts about JavaScript objects, the prototype chain, and property inheritance.

To determine the correct output when you execute console.log(jim.age) and console.log(jim.__proto__.age), it's essential to understand how prototype inheritance works in JavaScript.

When you call console.log(jim.age), JavaScript will look for the age property directly on the jim object. Since jim has its own age property set to 18, it will log 18.

Next, when you execute console.log(jim.__proto__.age), you're accessing the prototype of the jim object. Given that the prototype's age has been set to 29, the log will display 29.

This chain of property lookup—first checking on the object itself and then moving up to its prototype—explains why the output for the two console logs will be 18 followed by 29, making the correct answer the first choice.

The output sequence illustrates key concepts about JavaScript objects, the prototype chain, and property inheritance.