ArgumentsOptional.js

function addTogether(x) {
console.log("\n");  
console.log("In function" + arguments.length);

  if(arguments.length==2 && typeof arguments[0] === "number" && typeof arguments[1] === "number"){
    
    var sum = arguments[0] + arguments[1];
    return sum;
  }else{
    
      if(arguments.length==1){
          var n1 = arguments[0];
          console.log(n1);
          return function(n){
              console.log(n1);
              console.log(typeof n1);
              console.log(typeof arguments[0]);
              if(typeof n1 === "number" && typeof arguments[0] === "number"){
                var sum = n1 + arguments[0] ;
                  return sum;
              }else{
                
                  return undefined;
              }
          };//function
      }else{
          return undefined;    
      }
  } // if else
}