What will happen if you try to access an undefined property in an object?

When you attempt to access an undefined property in an object, the result is that the value of that property will simply be undefined. In JavaScript, undefined is the value returned when a variable is declared but not initialized, or when trying to reference a property that does not exist on an object.

For instance, if you have an object defined as let obj = { a: 1 }; and you try to access obj.b, the expression will evaluate to undefined. This behavior allows developers to programmatically check for the existence of properties and handle cases where properties are lacking without causing the program to crash.

In a debugging context, accessing an undefined property typically results in the console logging undefined, which provides a visual cue that the property was not found. This is crucial in scenarios where tracking object properties is essential for debugging and development purposes.

The behavior indeed prevents errors from disrupting the program flow, thus enabling a more robust handling of objects in JavaScript.