Salesforce JavaScript Developer Practice Exam

What is the expected output when console.logging from the shape object?

1. 20 and 62.83185307179586

2. 20 and NaN

3. 20 and 63

4. NaN and 63

The correct answer is: 20 and NaN

In the context of the question, the expected output depends on how the properties and methods of the "shape" object are defined, especially if they include calculations involving geometry. If the shape object contains a method for calculating the area (which is accurately returning 20) and another method for calculating the circumference, but the calculation involves an error or the wrong data type (like attempting mathematical operations on undefined or non-numeric values), it would result in NaN (Not-a-Number). This situation typically arises if, for instance, the code attempts to perform an operation involving a variable that is undefined or not properly initialized. In this scenario, the output is 20 for the area and NaN for the circumference due to a failure in the computation of the latter, creating an output that would appear as "20 and NaN." Thus, the reasoning behind the selection is that while the area is computed correctly, the attempt to compute the circumference fails due to data inconsistency or errors in calculation logic.