hoorain-atm/src/validation.ts

ATM Simulator: A Node.js package for creating console-based ATM simulations. Offers interactive prompts and colorful output for an engaging user experience.

//* Function to validate user pin
export const validatePin = (input: string) => {
    const number = parseInt(input, 10);

    if ((isNaN(number))  || (input.trim().length !== 4)) {
        return `Please enter a valid pin.`;
    }
    return true;
};

//* Function to validate user id/name
export const validateName = (input: string) => {
    if (input == '') {
        return "Please enter a valid username."
    }
    return true;
}

//* Function to validate amount user wants to transfer /deposit /withdraw
export const validateAmount = (input: string) => {
    const number = parseInt(input, 10);

    if ((isNaN(number)) || (number < 0)) {
        return `Please enter a valid amount.`;
    }
    if (!(number % 500 === 0)) {
        return `Please enter a amount in multiple of 500.`;
    }
    return true;
};

//* Function to validate account that user wants to transfer amount
export const validateAccount = (input: string) => {
    const number = parseInt(input, 10);

    if ((isNaN(number)) || (input.trim().length !== 11)) {
        return `Please enter a valid account number.`;
    }
    return true;
};