Add PureScript's Halogen v2.1.0

[thomashoneyman]

Hi @krausest!

I've provided a benchmark of the Halogen framework from PureScript (repo here).

This is a PureScript framework written 100% in PureScript including the virtual DOM. I believe it is the most widely-used framework in production.

[thomashoneyman]

Circle CI build:
https://circleci.com/gh/saylu/js-framework-benchmark/5

[krausest]

Thanks. Results are here.
To be honest - not really impressive. Does halogen support keyed updates?

The disk size is 146MB for halogen which is compared to the 177MB for ember quite ok.

Update: After running the benchmark I noticed that halogen doesn't preload the remove icon. I changed that in commit be8bb0f . I'll update the results soon, but I don't expect that it changes a lot.

[thomashoneyman]

I believe it's possible to do a keyed variant also. I've been stretched for time lately but can work on a keyed implementation to see if that has different results.

There are other PureScript frameworks that rely on React (Thermite is basically a wrapper for React) and should be fast for that reason. However, Halogen is 100% PureScript, which both has the benefit of being a joy to develop in and the downside of less investment into performance optimization.

Thanks for the merge!

[krausest]

@thomashoneyman I just noticed a bug: If you click "create 1,000 rows" and then "swap rows" the labels, but not the row ids, are swapped.

Can you please take a look at that?