ecmascript-harmony

I want to cache large objects in JS. These objects are retrieved by key, and it makes sense to cache them. But they won't fit in memory all at once, so I want them to be garbage collected if needed - the GC obviously knows better. It is pretty trivial to make such a cache using WeakReference or WeakValueDictionary found in other languages, but in ES6 we have WeakMap instead, where keys are weak. So, is it possible to make something like a WeakReference or make garbage-collected caches from WeakMap ? is it possible to make WeakReference from WeakMap or make garbage-collected cache from WeakMap

Could someone help me understand the differences between using Koa.js and Bluebird.js with ES6 Harmony. Specifically, how does co( function * () { //stuff } ); compare to, Promise.coroutine( function * () { //stuff } ); It just seems Koa should be using Bluebird and not recreating the wheel. What's different? For now the difference is that Koa allows yielding more than just promises. However a feature is being added that allows not only yielding callbacks, thunks etc but any arbitrary thing that comes to your mind. Bluebird is also the fastest. So after this version koa should be just using

I'm really enjoying ES6 generators. Is there a way I can detect generator support in browsers? I know generators might not be in a lot of browsers (or possible no browsers at all) at the moment, but that's OK for my purposes. I tried: try { function *(){} } catch(err) { console.log("No generators"); } But it doesn't seem to work. How can I detect support for ES6 generators in browsers? Jeremy J Starcher One of the few times that eval is actually the right solution. For language construct changes, you need something like this: try { eval("(function *(){})"); } catch(err) { console.log(err);

I used node.js(0.11.13) with --harmony flag and used function *() and yield keywords. I tried to simplify my development on node.js with help of coffeescript, so far it works great but I went into troubles with yield and declaring a generator - it complains about 'reserved keyword yield' . Any ideas? Another way to open the gate to the black dimension is: co = require 'co' sleep = require 'co-sleep' co(`function*(){1` console.log 'hi!' `yield sleep(1000)` console.log 'bye!' `1}`)() It's seems to be perfectly valid coffee-script, though, webstorm cofeescript plugin cries about errors, but it