Is this a callback function?-CodePudding

I m trying to write a callback function but not sure if i did it right.Can you check and correct ?

let username = prompt("Enter your username :");
let password = prompt("Enter your password :");
const userValid = /^[a-za-z0-9_.]*$/.test(username);
const passwordValid = /^[a-za-z0-9_]*$/.test(password);
  

let check = () => {
    if(userValid && passwordValid){
        correct();
    }else{
        not();
    }
}

let correct = () => {
    let msg = new Date(); 
    alert(`Welcome ${username}! Today is ${msg}.`);

}

let not = ()=> {
    alert(`Given username and password pair is not correct.Please try again!`);
}
check(correct,not)

CodePudding user response：

You forgot to add the functions in as parameters to check:

let check = (correct, not) => {
    if(userValid && passwordValid){
        correct();
    }else{
        not();
    }
};