Callback Functions in JavaScript

Callback Functions in JavaScript

function mySandwich(param1, param2, callback) {
    alert('Started eating my sandwich.\n\nIt has: ' + param1 + ', ' + param2);
    callback();
}
mySandwich('ham', 'cheese', function() {
alert('Finished eating my sandwich.');
});

function mySandwich(param1, param2, callback) {
alert('Started eating my sandwich.\n\nIt has: ' + param1 + ', ' + param2);
callback();
}

mySandwich('ham', 'cheese');

function mySandwich(param1, param2, callback) {
alert('Started eating my sandwich.\n\nIt has: ' + param1 + ', ' + param2);
if (callback) {
callback();
}
}

mySandwich('ham', 'cheese');

function mySandwich(param1, param2, callback) {
alert('Started eating my sandwich.\n\nIt has: ' + param1 + ', ' + param2);
if (callback && typeof(callback) === "function") {
callback();
}
}

mySandwich('ham', 'cheese', 'vegetables');

 

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