Dealing with new not being used when calling constructors in JS

JavaScript New Issue

// Quietly just handle the issue - but requires remembering to write the constructor name in the check!
// =====================================================================================================

function Foo(){
   // if user accidentally omits the new keyword, this will silently correct the problem...
   if ( !(this instanceof Foo) ){
      return new Foo();
   }
   // constructor logic follows...
}


// Throw an excpetion
// =====================================================================================================

function Foo(){
   if ( !(this instanceof arguments.callee) ){
      throw new Error("Constructor called as a function");
   }
   // constructor logic follows...
}