Version: 7.3.0, 6.4.0, 4.0.0 (Just tested these three) Platform: 1. Linux 4.8.13-1-ARCH #1 SMP PREEMPT x86_64 GNU/Linux 2. Also tested in Chrome 55.0.2883.75 (64-bit) ``` function test(){ this['fake'] = () =>{ console.log(arguments) } } var a = new test('a'); a.fake('dummyArguments') => 'a' ``` Shouldnt this return 'dummyArguments' since the arguments object is scoped http://stackoverflow.com/questions/29216881/inner-function-scope-in-javascript Where as when not using the function shorthand: ``` function test(){ this['fake'] = function() { console.log(arguments) } } var a = new test('a'); a.fake('dummyArguments') => 'dummyArguments' ```