How can I implement custom callbacks in JavaScript to execute code after a function completes?

Creating Custom Callbacks in JavaScript

To execute a callback function after a current function execution completes, you can implement a callback mechanism in JavaScript.

Declaring a Callback

Declare the callback as an argument to your function:

function LoadData(callback) {
    // Function body
}

Using the Callback

When calling the function, provide a callback function reference:

object.LoadData(function(loadedData, currentObject) {
    // Actions to perform when LoadData completes
});

Code Sample

// Define the callback:
function success(loadedData, currentObject) {
    // Actions to perform when LoadData is successful
}

// Call the function with the callback:
object.LoadData(success);

Advanced Features

• Calling with Specific Context: Use the call() method to specify the context for the callback, allowing access to a specific object's attributes and methods:

callback.call(this);

• Passing Arguments: Pass arguments to the callback using call() or apply():

callback.call(this, 'argument1', 'argument2');

callback.apply(this, ['argument1', 'argument2']);

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