JSFiddle - React, Tailwind, and code Playground

JavaScript

var Calculator = {
add: function() {
    var x = 0;
    for(var i=0; i<arguments.length; i++){
       x += arguments[i];
    }
     return x;
 },

subtract: function(arg1, arg2) {
  var y = arg1 - arg2;
  return y;
  },
  
multiply: function(arg1, arg2) {
  var z = arg1 * arg2;
  return z;
  },
  
divide: function(arg1, arg2) {
  if((!arg1 || !arg2) == 0){
  var w = arg1/arg2;
  return w;
  } else {
  return false;
  }
}
};

console.log(Calculator.add(4,4,8));