call back in js code example
Example 1: call back function in javascript
function greeting(name) {
alert('Hello ' + name);
}
function processUserInput(callback) {
var name = prompt('Please enter your name.');
callback(name);
}
processUserInput(greeting);
Example 2: javascript callback
// Create a callback in the probs, in this case we call it 'callback'
function newCallback(callback) {
callback('This can be any value you want to return')
}
// Do something with callback (in this case, we console log it)
function actionAferCallback (callbackData) {
console.log(callbackData)
}
// Function that asks for a callback from the newCallback function, then parses the value to actionAferCallback
function requestCallback() {
newCallback(actionAferCallback)
}
Example 3: js callback function
const add = (num1, num2) => num1 + num2;
const result = (num1, num2, cb) => {
return "result is:" + cb(num1, num2);
}
const res = result(12, 13, add);