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Creating a simple Javascript Pin code validation

I'm trying to create a pin validation in javascript. I want to ask the user for a pin and they input 1234. If they enter the wrong pin 3 times I want it to say the message "incorrect pin. contact bank". Thanks for any help

function pinCode() {
  const Pin = "1234"; {}
  const name = prompt("Please enter your full name");
  const user_Attempt = prompt("Please enter your PIN number to access your bank account");
  if (user_Attempt = Pin) {
    alert("Welcome" + name);
  } else {
    alert("Incorrect pin. Please contact your bank");
    return;
  }

}

3 months ago ·

Juan Pablo Isaza

3 answers

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Answer 1 · 2022-06-30T14:57:52.252Z

Perhaps use recursion for this


var incorrectCount = 0;

function pinCode() {
    if (incorrectCount != 3) {
        // prompts here
        if (user_Attempt === Pin) {
            // do stuff
         } else {
           incorrectCount += 1;
           pinCode();
        }
    } else {
        // code for too many incorrect tries
    }
}

Answer 2 · 2022-06-30T14:57:52.260Z

const pin = "1234";

let attemptsLeft = 3


const name = prompt("Please enter your full name");
for (attemptsLeft; attemptsLeft >= 0; attemptsLeft--) {
  if (attemptsLeft === 0) {
    alert("Incorrect pin. Please contact your bank");
    break;
  }
  const userAttempt = prompt(`Please enter your PIN number to access your bank account. You have ${attemptsLeft} left.`);
  if (userAttempt === pin) {
    alert("Welcome " + name);
    break;
  }
}

Answer 3 · 2022-06-30T14:57:52.266Z

Use a while loop to keep looping until either the attempts run out or pinCorrect is true.

const correctPin = '1234';
const maxAttempts = 3;
let attempts = 0;
let pinCorrect = false;

while (attempts < maxAttempts && !pinCorrect) {
  const pinInput = prompt(`Please enter your PIN number to access your bank account. ${maxAttempts - attempts} attempts left.`);
  pinCorrect = pinInput === correctPin;
  attempts++;
}

if (!pinCorrect) {
  alert('Incorrect pin. Please contact your bank');
} else {
  alert('Pin accepted');
}