randchars.gs

function RANDCHARS(len, num) {
  let text = "";
 
  //Check if numbers
  if(typeof len !== 'number' ||  typeof num !== 'number'){return text = "NaN"};
  
  const charString = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*()<>-=_+:;";
  let charStringRange = undefined;
  switch (num){
     case 0:
       //大文字小文字のアルファベット
       charStringRange = charString.substring(0,52);
       break;
      
     case 1:
       //英数字
       charStringRange = charString.substring(0,62);
       break;
      
     case 2:
       //英数字、記号
       charStringRange = charString;
       break;
      
    case 3:
       //小文字英数字
       charStringRange= charString.substring(26, 62);
       break;
      
     default:
       //error reporting
       return text = "Error: Type choice > 2"    
     
  }
  for (var i = 0; i < len; i++)
    text += charStringRange.charAt(Math.floor(Math.random() * charStringRange.length));
    
  return text;
}