What are Delegates?
In object-oriented programming, a delegate is a method that is called when another method is invoked.
Essentially, a delegate is a placeholder or a wrapper for a function.
This allows for code reusability and flexibility.
This page demonstrates the concept of delegates in object-oriented programming.
In object-oriented programming, a delegate is a method that is called when another method is invoked.
Essentially, a delegate is a placeholder or a wrapper for a function.
This allows for code reusability and flexibility.
Let's say we have a class called DataProcessor. It has a processData(data) method.
We can define a Delegate class that inherits from DataProcessor and provides a processData(data) method.
Now, you can use the Delegate class anywhere that has access to the DataProcessor instance.
data = 123
DataProcessor.processData(data)
This will call the processData method on the DataProcessor instance.
- Reusability: A delegate is reusable, not hardcoded.
-Flexibility: Allows you to easily add new behaviors without changing the original code.
Delegate Type: A method that is called when another method is invoked.
Delegate Name: The name of the method being called.
Input: The data passed to the delegate.
Example: A Listener
In event-driven programming, a listener is a delegate that responds to events.
A button click event triggers the listener.
myButton.addEventListener('click', myDelegate);
myDelegate: This is the method called when the button is clicked.
This shows a nested delegate to demonstrate that a method can also be a delegate.
function nestedFunction(data) {
nestedFunction.processData(data)