Callback Function Javascript

• What is a Callback function?

  • A callback function is a function passed into another function as an argument, which is then invoked inside the outer function to complete some kind of routine or action.

• Example 1:

function greeting(name) {
	console.log("Hello " + name);
}

function processUserInput(callback) {
	var name = "Chaitanya";
	callback(name);
}

processUserInput(greeting); // Greeting is the callback function

• Example 2:

// the anonymous function is the callback function
document.addEventListener("click", function () {

})