Consider the following JavaScript object:

let employee = {
name: "Bob",
salary: 80000,
benefits: {
bonus: 5000,
insurance: "full"
}
};

Which of the following correctly increases Bob's salary by 5000 and updates his bonus to be 15% of the new salary?

Question

Consider the following JavaScript object:

let employee = {
    name: "Bob",
    salary: 80000,
    benefits: {
        bonus: 5000,
        insurance: "full"
    }
};

Which of the following correctly increases Bob's salary by 5000 and updates his bonus to be 15% of the new salary?

BlackTom AI · Accepted Answer

We start by understanding the task: increase Bob's salary by 5000 and then set the bonus to 15% of the new salary.

Option 1: employee.salary += 5000; employee.benefits.bonus = employee.salary * 0.15;
- Step 1: The expression employee.salary += 5000 increments the salary property from 80000 to 85000.
- Step 2: The next expression updates the nested bonus property to be 0.15 times the (new) salary, which is 85000 * 0.15 = 12750.
- Result: salary is 85000 and bonus is 12750 inside employee.benefits. This matches the requirement of increasing salary by 5000 and setting the bonus to 15% of the new salary.

Option 2: employee["salary"] += 5000; employee["benefits"]["bonus"] = employee["salary"] * 0.15;
- Step 1: Using bracket notation, employee["salary"] += 5000; also increases the salary from 80000 to 85000, just like the dot notation in Option 1.
- Step 2: Then, employee["benefits"]["bonus"] = employee["salary"] * 0.15; computes 0.15 of the updated salary (85000) and assigns it to the nested bonus property.
- Result: The same end state as Option 1—salary 85000 and bonus 12750 within employee.benefits.

Both options perform the required two-step update in JavaScript object syntax:
- They correctly modify the top-level salary by +5000.
- They set the nested bonus to 15% of the new salary, ensuring the bonus reflects the updated salary value.

Common pitfalls to watch for in similar problems:
- Using the original salary (before the increment) when computing the bonus would yield the wrong bonus amount.
- Forgetting to update the nested bonus or accessing the wrong property (e.g., updating a non-existent path) would fail to reflect the required structure.
- Mixing different notation styles (dot vs bracket) is acceptable as long as they correctly reference the intended properties.

In summary, both provided options correctly accomplish the two-step update on Bob’s object structure, resulting in salary = 85000 and bonus = 12750.

Consider the following JavaScript object: let employee = { name: "Bob", salary: 80000, benefits: { bonus: 5000, insurance: "full" } }; Which of the following correctly increases Bob's salary by 5000 and updates his bonus to be 15% of the new salary?多项选择题

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