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Comment by sreque | Hacker News Reader

1. No it's not. It's mediocre at best. See my previous post.

2. No you can't, not anymore than you can reuse Java code between client and server with GWT. The difference between a browser and a client environment is just so great. NaCl will hopefully provide a way to bridge that gap, but that will work for every language, not just Javascript.

3. PyPy is starting to catch up to v8. This point is irrelevant for the AppEngine, by the way. I doubt Rhino is any faster than Jython.

4. Ever heard of Jython?

5. Ever heard of Jython?

Certain languages get way over-hyped on HN, and Javascript is one of them.

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> 1. No it's not. It's mediocre at best. See my previous post.

of course it is

> No you can't, not anymore than you can reuse Java code between client and server with GWT. The difference between a browser and a client environment is just so great.

pure bs, obviously you don't know what you are talking about. I am reusing extensively between server and client, not only for simple stuff like validations, but also to render graphics (have a server side canvas implementation that renders to svg), to perform web crawling (I use a simple version of envjs and jQuery/sizzle on the server side for crawling), i use the same template engine on server side and client side, etc, etc...

> 4. Ever heard of Jython?

Why would I be interested in Jython??!

1. You either didn't see my previous post or have no useful response.

2. Sorry, let me rephrase my point here. You can reuse code, but not all code. Any code you could reuse could also be re-used in another languages using tools like GWT, py2js, j2js, etc, mitigating server-side javascript's advantage here.

As for points 4 and 5, I couldn't care less whether you're interested or not. My point is that javascript has no unique advantage here over most other popular scripting languages, and you made an earlier comparison to Python, hence the Python example.

> 1. You either didn't see my previous post or have no useful response.

Javascript is a great language with some mistakes. a lot of the mistakes (including some you mentioned) are fixed in Ecmascript 5. I programmed in Ruby from 2002 since 2009, and I am happy I switched to JavaScript: I prefer the syntax, I totally love prototipical inheritance, I love to object literal notation, and the use of closures everywhere.

> 2. Sorry, let me rephrase my point here. You can reuse code, but not all code. Any code you could reuse could also be re-used in another languages using tools like GWT, py2js, j2js, etc, mitigating server-side javascript's advantage here.

as I said, pure bs.

> 4.5.

JavaScript has some advantages and some disadvantages to Python. AppengineJS is for people who know JavaScript (just about every web developer) and do not want to learn Python. If you know Python, just stick with the Python SDK.

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