// 'arguments' is allowed with rest parameters. var args; function restWithArgs(a, b, ...rest) { return arguments; } args = restWithArgs(1, 3, 6, 9); assertEq(args.length, 4); assertEq(JSON.stringify(args), '{"0":1,"1":3,"2":6,"3":9}'); args = restWithArgs(); assertEq(args.length, 0); args = restWithArgs(4, 5); assertEq(args.length, 2); assertEq(JSON.stringify(args), '{"0":4,"1":5}'); function restWithArgsEval(a, b, ...rest) { return eval("arguments"); } args = restWithArgsEval(1, 3, 6, 9); assertEq(args.length, 4); assertEq(JSON.stringify(args), '{"0":1,"1":3,"2":6,"3":9}'); function g(...rest) { h(); } function h() { g.arguments; } g(); // eval() is evil, but you can still use it with rest parameters! function still_use_eval(...rest) { eval("x = 4"); } still_use_eval();