How to Implement Closures Using SpiderMonkey API?

Question

I've been working with the SpiderMonkey C API and would like to implement a closure in C using their API. The one I would like to implement is fairly complex, but I can't even figure out how to do a simple one such as:

function x() {
   var i = 0;
   return function() { i++; print(i); };

}

var y = x();
y(); //1
y(); //2
y(); //3 

I was wondering if anyone knows how I might do this. I found the JS_NewFunction method, but I don't actually know if that is a step in the right direction. Any help will be appreciated, thanks!

Answer 1

I don't know if there's a pure C way of doing closures or not. I would reccomend though, if you can, to just implement the functionality you need in javascript, and simply evaluate the javascript text in JSAPI. From there, use JSAPI to grab whatever handles/variables you need to implement your host functionality. It's really onerous to do javascripty things using JSAPI, avoid it if you can.