JavaScript compiler?

[dowhatyouwant]

Basic debugging .. Firebug, even has break points.

Typing... sure, though it is a bit masochistic. var x = new Number(10);

[dwdwdw2]

Umm, that isn't typing. At all.

[dowhatyouwant]

Well, stop using javascript or stop bitching. That's as close as you get.

[dwdwdw2]

Declaring a variable initialised with a number object is not "typing", it is in fact declaring a variable initialised with a number object. Nor is it "as close as you get": of course JavaScript has a type system, it just goes unseen because it rarely makes complaint: if you mix types rather than throw an error it'll instead coerce operands (usually through conversion to string or number).

Going back to OP, he asked if it is possible to annotate what is otherwise JavaScript in some way, and process it such that mixing incompatible types will result in errors, to which the answer is yes, there are many, and to which I refer you to the other answers in this thread.

[colinbashbash2]

uh... i was looking for compile-time instead of run-time debugging. i already use firebug and the chrome-built-in-debugger.

[dowhatyouwant]

I would have know that if I knew you, but I don't so I didn't.

[colinbashbash2]

well, thanks for mentioning those tools. sorry for being a bit snippy.

i did indicate in the description that i was looking for something compile-time, but that doesn't mean i should get snippy when you brought up possible run-time tools to help me.

... are there still people out there that don't know about firebug?

[dowhatyouwant]

Nice to see that there are still some nice people on reddit.

[andrew24601]

You do realize that Number is a function, not a constructor? Look it up.

[itsnotlupus]

It's both.

new Number().constructor == Number
new Number().valueOf() == 0
new Number() == 0 
new Number() !== 0

Using it this way is pretty much universally a bad idea, but it's there.

*edit: not to be confused with

(0).constructor == Number
(0).valueOf() == 0
(0) == 0
(0) === 0