For the love of god, please do not use single-line alternatives to braced scopes. It's only tolerable in lambdas like Array.map( v => v**2 ). It's not for an implicit scope. It's for evaluating a return value.

But holy shit is it nice to have ?. in Javascript. It's such an anything-goes language until you look at it funny and it just shits the bed and silently dies. Hate hate haaate having to check if things exist, when so many other details fail politely and impact nothing. At least now it's one extra character instead of try-catch rigmarole.