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What exactly is Arel in Rails 3.0?
...age is that ARel implements an actual algebra of query operators. In other words, ARel knows about the mathematical rules for constructing and composing queries. If you concatenate two strings, each of which contains a valid SQL query, the result is probably not going to be a valid SQL query. Or, ev...
Is there a typical state machine implementation pattern?
...
would be better if this answer also would at least say 2 words about the other two approaches: a "global" method with a big switch-case, and separating states with the State Design Pattern and letting each state handle its transitions itself.
– erikbwork
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Should I always use a parallel stream when possible?
...y. However, the parts themselves may be processed simultaneously. In other words, if you have several CPU cores available, each part can run on its own core independently of the other parts, while processing its own elements sequentially. (NOTE: I don't know, if this is how parallel Java streams wor...
Find XOR of all numbers in a given range
...n the lowest two is special is because (00 ^ 01 ^ 10 ^ 11) == 00. In other words, every 4 values you cycle through gets you back to 0, and so you can cancel out all such cycles, which is why a%4 is significant.
– FatalError
May 20 '12 at 4:45
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Where does Java's String constant pool live, the heap or the stack?
...ontained all literal strings earlier used in your program
(the important word here is used – if a class or method was never
loaded/called, any constants defined in it will not be loaded).
The biggest issue with such string pool in Java 6 was its location –
the PermGen. PermGen has a f...
What is a None value?
... here
oops!
So the book is a little misleading mostly in its use of the word reset – assigning None to a name is a signal to a programmer that that value isn't being used or that the function should behave in some default way, but to reset a value to its original, undefined state you must use ...
Image Processing: Algorithm Improvement for 'Coca-Cola Can' Recognition
...em to be able to recognize Coca-Cola 'cans' (note that I'm stressing the word 'cans', you'll see why in a minute). You can see a sample below, with the can recognized in the green rectangle with scale and rotation.
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What is the purpose of AsQueryable()?
...ticular, the article states,
This offers an excellent benefits in real word scenarios where you have certain methods on an entity that return an IQueryable of T and some methods return List. But then you have business rule filter that needs to be applied on all the collection regardless if the c...
Does MySQL ignore null values on unique constraints?
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@Pijusn I got you. You're right, I have removed the wording suggesting otherwise. I mis-read the question. But I believe the answer still may be useful for users that stumble upon this question as I did while trying to find a way to have a unique "nothing" value, but are mista...
How do you maintain development code and production code? [closed]
... release) is implemented in the Git repo itself, with the gitworkflow (one word, illustrated here).
See more at rocketraman/gitworkflow. The history of doing this vs Trunk-Based-Development is noted in the comments and discussions of this article by Adam Dymitruk.
(source: Gitworkflow: A Task-O...