Salesforce JavaScript Developer Practice Exam

How can the assertion be corrected if the sum3 method is updated to multiply numbers?

1. let res = sum3([1, 2]); console.assert(res === 3);

2. let res = sum3([1, 2, 3, 4]); console.assert(res === 10);

3. let res = sum3([1, 2, 3, 4]); console.assert(res === 24);

4. let res = sum3([3, 2, 1]); console.assert(res === 6);

The correct answer is: let res = sum3([1, 2, 3, 4]); console.assert(res === 24);

When the definition of the sum3 method changes from summing numbers to multiplying them, the assertion must reflect the new expected behavior. In the case of option C, the method is called with the parameters [1, 2, 3, 4]. When multiplied together, the calculation would be: 1 * 2 * 3 * 4 = 24. Therefore, the assertion correctly checks whether the result of the sum3 method, which is now performing multiplication, equals 24. This aligns perfectly with the behavior of the updated method. In contrast, the other choices do not provide the correct expected outcome based on the new multiplication logic. Option A incorrectly asserts that the result of adding the numbers together would equal 3, which does not apply to the new multiplication function. Similarly, option B reflects a sum result of 10, and option D indicates a sum of 6, neither of which accurately correspond to the multiplication of the specified numbers. Thus, C stands out as the only choice that is in harmony with the updated functionality of the sum3 method.