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Are Javascript arrays sparse?
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How exactly JavaScript arrays are implemented differs from browser to browser, but they generally fall back to a sparse implementation - most likely the same one used for property access of regular objects - if using an actual array would be inefficient.
You'll have to ask some...
In mongoDb, how do you remove an array element by its index?
...ions. If we need the operation to be atomic, we could:
Read the document from the database
Update the document and remove the item in the array
Replace the document in the database. To ensure the document has not changed since we read it, we can use the update if current pattern described in the m...
What is a mixin, and why are they useful?
In " Programming Python ", Mark Lutz mentions "mixins". I'm from a C/C++/C# background and I have not heard the term before. What is a mixin?
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How to create module-wide variables in Python? [duplicate]
...nt the variable to be "private" to the module. If you ever do an import * from mymodule, Python will not import names with two leading underscores into your name space. But if you just do a simple import mymodule and then say dir(mymodule) you will see the "private" variables in the list, and if y...
Getting visitors country from their IP
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You can use a simple API from http://www.geoplugin.net/
$xml = simplexml_load_file("http://www.geoplugin.net/xml.gp?ip=".getRealIpAddr());
echo $xml->geoplugin_countryName ;
echo "<pre>";
foreach ($xml as $key => $value)
{
echo $k...
How do I make a matrix from a list of vectors in R?
Goal: from a list of vectors of equal length, create a matrix where each vector becomes a row.
6 Answers
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Can I do a synchronous request with volley?
...'t understand. It sits until a notify will be called and it will be called from UI thread. Until you have two different thread I can't see the deadlock
– greywolf82
May 17 '15 at 14:58
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Checking from shell script if a directory contains files
From a shell script, how do I check if a directory contains files?
26 Answers
26
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How can I exclude some folders from my Eclipse project?
...e-base, and I'd like to know if there is a way to exclude some directories from being picked up by eclipse at all? The reason is that we have a huge "third-party" directory in our repository that cannot be present in the project for the pair-programming plugin we are using to be able to sync effi...
Get underlying NSData from UIImage
I can create UIImage from NSData using [UIImage imageWithData:] or [UIImage initWithData:] methods.
6 Answers
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