What will be logged to the console if a modified object is reused as a default parameter in a function call?

When a modified object is reused as a default parameter in a function call, the same modified instance will be passed each time the function is invoked. This happens because default parameter values in JavaScript are evaluated at the time the function is defined, not at the time the function is called. Consequently, if an object is passed as a default parameter, modifications to that object will persist across function calls.

For instance, if you define a function with an object as a default parameter and then modify that object inside the function, those changes will reflect in every subsequent call to the function. The reason is that the default parameter is not a new instance each time the function is called; it simply references the same object instance in memory. Therefore, any alteration to this object during any function call will affect its value in every subsequent call where the object is used as a default parameter.

This characteristic of JavaScript can lead to unintended side effects if developers are not aware that the object being passed as a default parameter retains its state across calls. Thus, the answer accurately reflects this behavior of function parameters and object references in JavaScript.