Callbacks Functions

JavaScript File

     //  Callbacks Functions 

function hello() {
    document.writeln("This Will print,Hello After 5 Seconds !");
}

function bye() {
    document.writeln("This Will print, Bye After 2 Seconds !");
}
setTimeout(hello, 5000);
setTimeout(bye, 2000);



// Call Backs Function Example !
// Function pass to the function is called Callback Functions
document.writeln("
This Is Callback function
");

function callback(callbackfunc) {
       document.writeln("This is first functions ! first one");
       callbackfunc(); // this is callback func, instant call after first function
}
callback(() => document.writeln("
This is Callbackfunc functions, second function!"));
document.writeln("
Callback Function Stored in Parameter and call via in arguments
");
document.writeln("

");

// Parameterized Callback Functions !
document.writeln("
Paramerized Callback function
");
function fetchdata(callbackfunct) {
    let data = "Data from phonepay upi !, Call via paramter !";
    callbackfunct(data);
};

fetchdata((n) => document.writeln(n));

document.writeln("

");



// Topics to Learn

// callback function
// fetch api
// Promises
// Async Wait

    

JavaScript Output :