Is there a “not in” operator in JavaScript for checking object properties?

Question

Is there any sort of \"not in\" operator in JavaScript to check if a property does not exist in an object? I couldn’t find anything about this around Google or Stack Overflo

Answer 1

Personally I find

if (id in tutorTimes === false) { ... }

easier to read than

if (!(id in tutorTimes)) { ... }

but both will work.