Is the implementation of XMLHttpRequest different per browser? - web

Please, help me to figure out this, I was curious about the source code of methods like XMLHttpRequest.open() as per
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest,
after some (relatively) lazy googling I wasn't able to find out how methods of that API are implemented, I found references to some code on c++, for example here nsXMLHttpRequest. My question is, are the implementation of that object especific to browsers?
A beginner question, certainly. Thanks if you can help me to understand how this all stuff is related.

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What is the purpose of 'require.paths.unshift()' in Node.js?

I'm new to javascript and NodeJS and I've been looking at a bit of deprecated code and I've come across 'require.paths.unshift()' on many occasions at the start of a file. To my understanding, this syntax has been long removed from NodeJS, but in order for me to understand and potentially fix up the old code, I need to understand it's meaning and context.
I've tried looking for it online but I couldn't find much on it. If someone could please explain the context of it's use or a newer implementation, I'd much appreciate it.

Learning Viewflow and Documentation

Viewflow sounds like a really useful library, but I've spent two days reading everything I can about it and still don't have a good idea of how to use it.
The current documentation seems to cover
The problems that viewflow is intended to solve
Some very basic examples
In-depth details of its various components.
What seems to be missing is the area between two and three. So I'm looking for something that gives a certain amount of detail and explains viewflow's overall structure while also explaining how things are being done and how one might do something differently if one wanted to.
Does anyone know of any tutorials or documentation that could help to fill this gap? Viewflow certainly sounds great but at the moment, I'm a long way from finding it usable.

Semantics based code search

We have a large number of repositories. We want to implement a semantics(functionality) based code search on those repositories. Right now, we already have implemented keyword based code search in which we crawled through all the repository files and indexed them using elasticsearch. But that doesn't solve our problem as some of the repositories are poorly commented and documented, thus searching for specific codes/libraries become difficult.
So my question is: Is there any opensource libraries or any previous work done in this field which could help us index the semantics of the repository files, so that searching the code becomes easy and this would also help us in re-usability of the codes. I have found some research papers like Semantic code browsing, Semantics-based code search etc. but were of no use as there was no actual implementation given. So can you please suggest some good libraries or projects which could help me in achieving the same.
P.S:-Moreover, companies like Koders, Google, cocycles.com etc. started their code search based on functionality. But most of them have shut down their operations without giving any proper feedback, can anyone please tell me what kind of difficulties they are facing.
not sure if this is what you're looking for, but I wrote https://github.com/google/zoekt , which uses ctags-based understanding of code to improve ranking.
Take a look at insight.io
It provides semantic search and browsing

Using Hint to dynamically compile and load Haskell

In this post, the discussion makes it seem like Haskell's Hint package can compile source code and load compiled programs (as opposed to interpreting a source file).
However, I don't really see any of that functionality in the API, and that post seems to have gone dead before answering the question.
So... how do you do it, or did I get the wrong impression?
Thanks!

Does anyone know where decent documentation describing the Lucene index format IN DETAIL on the web is?

I am mainly curious as to the inner workings of the engine itself. I couldnt find anything about the index format itself (IE in detail as though you were going to build your own compatible implementation) and how it works. I have poked through the code, but its a little large to swallow for what must be described somewhere since there are so many compatible ports to other languages around. Can anyone provide a decent link?
Have you seen this: http://lucene.apache.org/java/2_4_0/fileformats.html? It's the most detailed I've found.
Although Lucene in Action does stop short of the detail in that link, I found it a useful companion to keep a handle on the big picture concepts while understanding the nitty gritty.

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