callback function

A callback function is a function passed as an argument to another function. The receiving function (often called the higher-order function) then invokes the callback function at some point during its execution.

function greet(name, callback) {
  console.log("Hello,", name);
  callback(name); // Call the callback function
}
 
function sayGoodbye(name) {
  console.log("Goodbye,", name);
}
 
greet("Alice", sayGoodbye);  // Pass sayGoodbye as a callback
 
// Output:
// Hello, Alice
// Goodbye, Alice
 

Benefits:

• Flexibility: Enables customization of behavior within a function.
• Asynchronous Programming: Allows functions to execute tasks and then call another function when finished.
• Code Reusability: Promotes modularity by separating concerns.