OSINT username list generator, enumerating usernames, list of usernames etc.

whatsmyusername.js

// OSINT username list generator

const arg = process.argv.slice(2);

if (process.argv.length === 3) {
  console.log("[*]usage: node whatsmyusername.js Hugo Smith")
  console.log("Enter first name and last name!(E.g Hugo Smith)")
  process.exit(1);
}

fName = arg[0]
mName = ''
lName = arg[1]

const x = [];
const y = [];

// first and last names
x[1] = fName + ' ' + lName;
x[2] = fName.substr(0, 1) + '. ' + lName;
x[3] = lName + ' ' + fName;
x[4] = lName + ' ' + fName.substr(0, 1) + '.';
x[5] = lName;
x[6] = fName.toLowerCase() + '.' + lName.toLowerCase();
x[7] = lName.toLowerCase() + '.' + fName.toLowerCase();
x[8] = fName.substr(0, 1).toLowerCase() + '.' + lName.toLowerCase();
x[9] = lName.toLowerCase() + '.' + fName.substr(0, 1).toLowerCase();
x[10] = fName.toLowerCase() + lName.toLowerCase();
x[11] = lName.toLowerCase() + fName.toLowerCase();
x[12] = fName.substr(0, 1).toLowerCase() + lName.toLowerCase();
x[13] = lName.toLowerCase() + fName.substr(0, 1).toLowerCase();
x[14] = fName.toLowerCase() + lName.substr(0, 1).toLowerCase();
x[15] = fName.substr(0, 1) + lName;
x[16] = lName + fName.substr(0, 1);
console.log('---------------------------------')
x.forEach(element => console.log(element));

// if middle name exists
if (mName.length > 0) {
  y[1] = fName + ' ' + mName + ' ' + lName;
  y[2] = fName.substr(0, 1) + '. ' + mName.substr(0, 1) + '. ' + lName;
  y[3] = lName + ' ' + fName + ' ' + mName;
  y[4] = lName + ' ' + fName.substr(0, 1) + '. ' + mName.substr(0, 1) + '.';
  y[5] = mName + ' ' + lName;
  y[6] = fName.toLowerCase() + mName.toLowerCase() + lName.toLowerCase();
  y[7] = lName.toLowerCase() + fName.toLowerCase() + mName.toLowerCase();
  y[8] = fName.substr(0, 1).toLowerCase() + mName.substr(0, 1).toLowerCase() + lName.toLowerCase();
  y[9] = lName.toLowerCase() + fName.substr(0, 1).toLowerCase() + mName.substr(0, 1).toLowerCase();
  y[10] = mName.toLowerCase() + lName.toLowerCase();
  y[11] = lName.toLowerCase() + mName.toLowerCase();
  y[12] = mName.toLowerCase();
  y.forEach(element => console.log(element));
}