JavaScript version of this jQuery line [closed] - javascript

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I am searching for a javascript alternative for the following code:
$('a[href*="vivo.sx/"]').attr('href')
I have never worked with javascript. This may be very simple for someone who's more experienced with javascript.

I've done a version that does it both way for comparison..
Please note I've used document.querySelector, not document.querySelectorAll, if you use the All variant, remember you need to loop the result.
console.log( $('a[href*="vivo.sx/"]').attr('href') );
console.log( document.querySelector('a[href*="vivo.sx/"]').href );
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
one

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return hex(id(self.table[hash]))
I do not know how to convert the following code from python to java script.
You don't.
There is no equivalent code to that in JavaScript, since id returns the address of the object (in CPython anyway), and there's no way to do that in JavaScript.

Best way to understand javascript complex code? [closed]

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What is the best way to understand javascript complex code, like I use to debugger for understand the java complex code.
So, there is any way for javascript like java?
you can use either IE/Chrome Developer Tools, press F12 on the browser and afterward put any breakpoint on javascript file.

Multilanguage in a HTML webpage [closed]

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I am realtivly new to web programming and I am looking for something similar as res/values/strings.xml in android, but for a webpage. Does something like this exist (a link to a book describing this solution)?
Thanks!
Try to read about knockout.js, I think it's useful framework in your case.

how does getElementsByClassName() work under the hood? [closed]

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I've tended to just loop over elements selectively to find elements of a specific class, but I'm curious if using getElementsByClassName (for applicable browsers) will increase performance at all.
How does it actually WORK?
I could easily run a test to check performance obviously, but I'm really curious what's going on in there anyway.

How should I go about writing a JavaScript plugin API in Ruby? [closed]

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I'm doing a project in Ruby, and I want to be able to write plugins for it in JavaScript, so I'm working on a JavaScript API for it. How should I go about doing this?
I would recommend using an existing javascript interpreter, like therubyracer. You can eval the plugin code and interact with it through that.

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