pvdz.ee - 11.2.2 New Operator

NewExpression : new NewExpression

Code: (Meta Ecma)

function evaluate(new NewExpression) {
  var ref = evaluate(NewExpression);
  var constructor = GetValue(ref);
  if (Type(constructor) != 'object') throw TypeError;
  if (!([[Construc]] in constructor)) throw TypeError;
  return constructor.[[Construct]]();
}

Note that this production explicitly allows the new operator to be used without parenthesis. So "new Object;" and "new Object();" are the same because a new Object is created for both and no parameters are supplied for both. There is no noticable difference. Note that syntactically, you could even do "new new Object".

NewExpression : new MemberExpression Arguments

Code: (Meta Ecma)

function evaluate(new MemberExpression Arguments) {
  var ref = evaluate(MemberExpression);
  var constructor = GetValue(ref);
  var argList = evaluate(Arguments); // returns a List
  if (Type(constructor) != 'object') throw TypeError;
  if (!([[Construc]] in constructor)) throw TypeError;
  return constructor.[[Construct]](argList);
}