Looks better than if(typeof x ==='undefined')?
In most cases, you can (and should) write just
if (x !== undefined)
It's only when dealing with possibly undeclared variables that you need to use
typeof, and those cases are rare enough to not warrant special syntax.
I am asking if it is defined goddamnit, not if its type is undefined. That should sound like same thing, but google searches doesnt make best programming language.
Let’s calm down please :-)
I understand that you’re saying “is x defined” sounds clearer than “is the type of x undefined”, and i agree!
However, since the way to check for definededness is well understood, and since adding new syntax is a large change and thus requires a very compelling reason to add, how would you persuade those who don’t think it’s worth it?
There should be hook method for syntax in every engine.
e.g. python has customizable grammar by file next to source, adding new syntax to langs is easy.
I just think that typeof undefined... it's clumsy.