Tab vs Space => can not remove Space, so Tab has to go, not adding value :)
Single Quote vs Double Quote => keep Double Quote, single quote is used as apostrophe
"let" vs "var" keyword => keep "let", var is confusing people; const is even better
"stop using IE" :) "IE does not spark joy"
"null" vs "undefined" => get rid of "null"
null could be defined as immutable empty object in ES6: const null = Object.freeze(Object.create);
link from: .NET Rocks! vNext