1function generateOTP() {
2          
3    // Declare a digits variable 
4    // which stores all digits
5    var digits = '0123456789';
6    let OTP = '';
7    for (let i = 0; i < 4; i++ ) {
8        OTP += digits[Math.floor(Math.random() * 10)];
9    }
10    return OTP;
11}