A Js function to create a function add a set of number - #LIT

add.js

function add(x,y) {
  var foo = "function customAdd(";
  var script = document.createElement('script');
  script.setAttribute('type', 'text/javascript');
  foo += arguments[0];
  for (var i = 1; i < arguments.length; i++){
    if(typeof arguments[i] != "number"){
      throw new Error("you cheater");
    }
    foo += "," + arguments[i];
  }
  
  foo += "){ return "+ arguments[0];
  
  for (var i = 1; i < arguments.length; i++){
    foo += "+" + arguments[i];
  }
  
  foo += '); } alert(customAdd());'
  
  console.log(foo);
  script.src = foo;
  document.getElementsByTagName('head').apendChild(script);
}
add(1,2,3,4,5)