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What is getattr() exactly and how do I use it?
...ct.x, because you don't know in advance which attribute you want (it comes from a string). Very useful for meta-programming.
you want to provide a default value. object.y will raise an AttributeError if there's no y. But getattr(object, 'y', 5) will return 5.
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Get property value from string using reflection
I am trying implement the Data transformation using Reflection 1 example in my code.
22 Answers
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Git for beginners: The definitive practical guide
... simply a directory containing a special .git directory.
This is different from "centralised" version-control systems (like subversion), where a "repository" is hosted on a remote server, which you checkout into a "working copy" directory. With git, your working copy is the repository.
Simply run gi...
Difference between solr and lucene
... plain Lucene as it's easy to use. However, they never restrain themselves from customizing Solr to the maximum extent.
BTW, I see that there are more resources on Solr (4.x) than Lucene (4.x).
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Deep cloning objects
...en an object gets too complex.
And with the use of extension methods (also from the originally referenced source):
In case of you prefer to use the new extension methods of C# 3.0, change the method to have the following signature:
public static T Clone<T>(this T source)
{
//...
}
Now the ...
Which websocket library to use with Node.js? [closed]
...roxy like nginx, you can route the WebSocket protocol urls to another port from the normal HTTP protocols.
– Prahlad Yeri
Dec 5 '15 at 22:54
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How does password salt help against a rainbow table attack?
...n later "update" it with some salt. You have to take the salt into account from the beginning.
This is the whole reason for why you need a rainbow table in the first place. Because you cannot get to the password from the hash, you precompute all the hashes of the most likely used passwords and then ...
Strange, unexpected behavior (disappearing/changing values) when using Hash default value, e.g. Hash
... in the hash if required.
So we must store the default value in the hash from within the block if we wish to use << instead of <<=:
h = Hash.new { |h, k| h[k] = [] }
h[0] << 'a' #=> ["a"]
h[1] << 'b' #=> ["b"]
h #=> {0=>["a"], 1=>["b"]}
This e...
Android Bitmap to Base64 String
...yte[] byteArray = byteArrayOutputStream .toByteArray();
to encode base64 from byte array use following method
String encoded = Base64.encodeToString(byteArray, Base64.DEFAULT);
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Why are quaternions used for rotations?
...ler angles use the least memory; matrices use more memory but don't suffer from Gimbal lock and have nice analytical properties; and quaternions strike a nice balance of both, being lightweight, but free from Gimbal lock.
sh...