didSetnewValue

didSet is a property observer in Swift that is called immediately after a value has been set. It allows you to perform actions or updates in response to a property's value changing. The didSet observer is invoked every time the property's value is set, including during initialization.

Within the didSet block, you can access the new value that was just assigned to the property. This is done using the implicit parameter named newValue. Therefore, the syntax is typically written as `didSet(newValue) { ... }`. Inside this block, you can use newValue to refer to the updated value of the property.

didSet is useful for a variety of tasks, such as updating the user interface, invalidating related data, or triggering other logic based on the property's change. For example, if you have a property representing a user's score, you might use didSet to update a score label on the screen whenever the score changes. Another common use case is to reset or re-calculate other properties when a specific property is modified.

It's important to note that you cannot modify the property itself within its own didSet observer. Doing so would lead to an infinite loop. If you need to perform actions that might modify the property, you should consider using willSet, which is called *before* the value is stored, or restructuring your logic. Both willSet and didSet are powerful tools for managing state and reactivity in your Swift code.