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javascript callback

/*
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. 
*/
function greeting(name) {
  alert('Hello ' + name);
}

function processUserInput(callback) {
  var name = prompt('Please enter your name.');
  callback(name);
}

processUserInput(greeting);
// The above example is a synchronous callback, as it is executed immediately.
Comment

What is callback in js

// What is callback functions in js

// Lets make a function

// Putting parameter in it "callback"
function func1(callback) {
  console.log(callback); // Log 'callback'; And now our parameter callback is a function and we can call it from our func1 and this is what callback is
  hello();
}

// Making one more function to print hello world in console
function hello() {
  console.log("Hello world");
}

func1(hello); // Call func and give hello function as a arguement; Yes we can give function as arguement

// func1(hello()); // This is wrong way to give function as arguement
Comment

callback function

function greeting(name) {
  alert('Hello ' + name);
}

function processUserInput(callback) {
  var name = prompt('Please enter your name.');
  callback(name);
}

processUserInput(greeting);
Comment

create callback function javascript

function add(a, b, callback) {
  if (callback && typeof(callback) === "function") {
    callback(a + b);
  }
}

add(5, 3, function(answer) {
  console.log(answer);
});
Comment

callback function

//Callback functions - are functions that are called AFTER something happened

  const foo = (number, callbackFunction) => {
    //first 
    console.log(number)
    
    //second - runs AFTER console.log() happened
    callbackFunction()
  }
Comment

callback in js

function greeting(name) {
  alert('Hello ' + name);
}

function processUserInput(callback , {
  var name = prompt('Please enter your name.');
  callback(name);
}}

processUserInput(greeting);
Comment

callback function

// Create calculator calling different operators with functions in javascript 

function pow(value0, value1) {
    return Math.pow(value0, value1);
}

function mod(value0, value1) {
    return value0 % value1;
}

function div(value0, value1) {
    return value0 / value1;
}

function mul(value0, value1) {
    return value0 * value1;
}

function add(value0, value1) {
    return value0 + value1;
}

function subtract(value0, value1) {
    return value0 - value1;
}

function calculator(value0, value1, operator) {
    return operator(value0, value1);
}

console.log(calculator(2,5,mod));
Comment

how to make callback function javascript

function startWith(message, callback){
	console.log("Clearly written messages is: " + message);
  
  	//check if the callback variable is a function..
  	if(typeof callback == "function"){
    	callback(); //execute function if function is truly a function.
    }
}
//finally execute function at the end 
startWith("This Messsage", function mySpecialCallback(){
	console.log("Message from callback function");
})
Comment

callback in javascript

function sum(num1,num2,callback){
    let total = num1 + num2
    callback(total)
}

sum(10,20,function(total){
    // received total here
    console.log(total);
})

sum(5,16,(total)=>{
    console.log(total);
})
Comment

callback function

const ironMan = withGloves(withBoots(withArmor(withHelmet(TonyStark))));
Comment

Callback Function

function greeting(name) {
  alert(`Hello, ${name}`);
}

function processUserInput(callback) {
  const name = prompt("Please enter your name.");
  callback(name);
}

processUserInput(greeting);
Comment

JavaScript CallBack Function

// function
function greet(name) {
    console.log('Hi' + ' ' + name);
}

greet('Peter'); // Hi Peter
Comment

example of callback function in javascript

<html>  
<head>  
  
</head>  
<body>  
<h1>Hello User</h1>  
<h2> This is the softhunt.net</h2>  
<script>  
function showData(name, amt) {  
alert(' Hello ' + name + '
 Your entered amount is ' + amt);  
}  
  
function getData(callback) {  
var name = prompt(" Welcome to the softhunt.net 
 What is your name?");  
var amt = prompt(" Enter some amount...");  
callback(name, amt);  
}  
  
getData(showData);  
</script>  
</body>  
  
</html>
Comment

JavaScript Callback

api(function(result){
    api2(function(result2){
        api3(function(result3){
             // do work
            if(error) {
                // do something
            }
            else {
                // do something
            }
        });
    });
});
Comment

JavaScript Callbacks

function myFirst() {
  myDisplayer("Hello");
}

function mySecond() {
  myDisplayer("Goodbye");
}

myFirst();
mySecond();
Comment

javascript callback

method(callback => {
	callback.property
})
Comment
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