What happens when the following code is executed if the intent property is null? val message = intent.extras?.getString("message").toString()

What happens when the following code is executed if the intent property is null? val message = intent.extras?.getString("message").toString()

• A. The app will crash because it attempted to access the extras property on a null object.
• B. The app will crash because it attempted to access a null object.
• C. The app will not crash because the extras property is accessed unsafely using '?'
• D. The app will not crash because the extras property is accessed safely using '?'

Answer: (A)

In this scenario, when the intent property is null, the code being executed will not crash because of the safe call operator `?.`. Safe calls help prevent null pointer exceptions by allowing you to safely access properties or methods on a nullable type. In this case, if `intent` is null, the expression `intent.extras` will also be null, but because of the safe call operator, the code will short-circuit and not attempt to access `extras`, thereby avoiding a crash. Instead, the expression `intent.extras?.getString("message")` will evaluate to null, leading to the next part of the code, which converts that to a String using `toString()`. Since `toString()` on null returns the string `"null"`, the final value of `message` will simply be the string "null" rather than causing a runtime exception. This means that the app will run smoothly without crashing, confirming that access through the safe call operator makes it possible to handle potentially null values without an issue.

In this scenario, when the intent property is null, the code being executed will not crash because of the safe call operator ?.. Safe calls help prevent null pointer exceptions by allowing you to safely access properties or methods on a nullable type. In this case, if intent is null, the expression intent.extras will also be null, but because of the safe call operator, the code will short-circuit and not attempt to access extras, thereby avoiding a crash.

Instead, the expression intent.extras?.getString("message") will evaluate to null, leading to the next part of the code, which converts that to a String using toString(). Since toString() on null returns the string "null", the final value of message will simply be the string "null" rather than causing a runtime exception.

This means that the app will run smoothly without crashing, confirming that access through the safe call operator makes it possible to handle potentially null values without an issue.