I want to set additional Parameters to callback function when defining it. // min Length validator function minLengthValidator(input, minLength) { console.log("Length is", input.length, "min Length is", minLength); return input.length >= minLength; } // using the callback in an validate function (e.g. on an Input field) and only give it the input value function validate(callback) {… Read More Javascript add param when calling a callback function

I have this error and can not solve this. I tried looking for asked questions and none answers my problem.I tried working with the code, it looks simple but yet confusing as I’m just learning this.I want output as Nepal, China and the United States I have this code: import { countries } from "./data.js";… Read More Cannot generate required string with reduce in JS

I have a script that has a lot of height animations. So i figured I could juste make one function with the animation and call it whenever I want. The thing is, when the function is complete I have various things that can be done. So this is the solution I have so far that… Read More jQuery callback after function is complete

Suppose I have a 3 functions: void A(int i){…} void B(bool b, string s){…} void C(float f, double d, char c){…} In my application, in a given moment, I open a popup that has a button. My popup has a controller (called PopupController). It has references for everything in the popup and includes the function… Read More how to store functions and arguments to execute later

Going through some practice problems and can’t figure out how correctly callback. It returns " let myForEach = function(array, cb) { for (let j = 0; j < array.length; j++) { cb(array[j]) } }; myForEach([‘a’, ‘b’, ‘c’], function(el, i) { console.log(el + ‘ is at index ‘ + i); }); // expected return “a is… Read More How do I utilize the index for my callback?

I have the following code to demonstrate a function been called inside another function. The below code works correctly: #include <iostream> #include <functional> int thirds(int a) { return a + 1; } template <typename T, typename B , typename L> //————————————————VVVVV- int hello(T x, B y, L func) { int first = x + 1;… Read More std::function error conversion from ‘x' to non-scalar type ‘y’ requested?

I am trying to understand the use of callback, promise, and async/await. The code I pasted below is working fine but I am wondering if it is the best way to present the same meaning in using callbacks, given that callback style might lead to "callback hell", or should I train myself writing all codes… Read More The uses of callback or async await

Good day. I am a flutter beginner and now do some simple pratice. I want: Press a button and call login api, if api response is success then go to main page. but I don’t know how to get callback result. viewModel Future<String> login(String account, String password) async { try { futureLogin = logon(account, password);… Read More How to get Future callback in Flutter

I’m trying to make a custom ElevatedButton widget whose constructor will receive one of two options: either a new page to push into the Navigator (my custom StatefulWidget), or a callback method to override the button’s onPressed entirely. I tried to create two separate constructors – one for each of the possibilities but the constructor… Read More Pass either a widget or a callback to button