generateRandomPassword

generateRandomPassword.js

/// @param {number} length
/// @param {boolean} useUpper
/// @param {boolean} useLower
/// @param {boolean} useNumber
/// @return {string} Generated password.
/// Generate password
function generateRandomPassword(length, useUpper, useLower, useNumber, useSymbol, easy) {
  if (typeof length === "undefined") length = 12;
  if (typeof useUpper === "undefined") useUpper = true;
  if (typeof useLower === "undefined") useLower = true;
  if (typeof useNumber === "undefined") useNumber = true;
  if (typeof useSymbol === "undefined") useSymbol = true;
  if (typeof easy === "undefined") easy = true;
  if (!(useUpper || useLower || useNumber || useSymbol)) throw "Set true to at least one of useUpper, useLower, useNumber and useSymbol.";
  
  var uppers = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
  var lowers = uppers.toLowerCase();
  var numbers = '0123456789';
  var symbols = '!"#$%^&*()_=-+<>,./?:;\'@\\|{}[]`~';
  
  var chars = '';
  if (useUpper) chars += uppers;
  if (useLower) chars += lowers;
  if (useNumber) chars += numbers;
  if (useSymbol) {
    if (easy) chars += chars + chars;
    chars += symbols;
  }
  var password = '';
  for (var i = 0; i < length; i++) {
    password += chars[Math.floor((Math.random() * chars.length))];
  }
  
  return password;
}