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How can I trim beginning and ending double quotes from a string?
...\"$ for this.
E.g.
string = string.replaceAll("^\"|\"$", "");
To learn more about regular expressions, have al ook at http://regular-expression.info.
That said, this smells a bit like that you're trying to invent a CSV parser. If so, I'd suggest to look around for existing libraries, such as Op...
What is the performance cost of having a virtual method in a C++ class?
...at matters is whether the function has been run before recently (making it more likely to be in cache), and whether your architecture can predict static (not virtual) branches and fetch those instructions into cache ahead of time. My PPC does not, but maybe Intel's most recent hardware does.
My ti...
Storing money in a decimal column - what precision and scale?
...f thumb for storage of fixed point decimal values is to store at least one more decimal place than you actually require to allow for rounding. One of the reasons for mapping the old Currency type in the front end to DECIMAL(19, 4) type in the back end was that Currency exhibited bankers' rounding by...
What are some good resources for learning about Artificial Neural Networks? [closed]
...mple gradient descent, but this can be much slower and less effective than more nuanced methods like
Once you've got the basic ideas down you can start to experiment with different "squashing" functions in your hidden layer, adding various kinds of regularization, and various tweaks to make learni...
Number of occurrences of a character in a string [duplicate]
...ensions to make a simpler, and almost as efficient version. There is a bit more overhead, but it's still surprisingly close to the loop in performance:
int cnt = test.Count(c => c == '&');
Then there is the old Replace trick, however that is better suited for languages where looping is awk...
Understanding recursion [closed]
...Why, yes, recursion can be replaced with iteration, but often recursion is more elegant.
Let's talk about trees. In computer science, a tree is a structure made up of nodes, where each node has some number of children that are also nodes, or null. A binary tree is a tree made of nodes that have exa...
Create Windows service from executable
...otation marks around the actual exe path, and a space after the binPath=.
More information on the sc command can be found in Microsoft KB251192.
Note that it will not work for just any executable: the executable must be a Windows Service (i.e. implement ServiceMain). When registering a non-servic...
How to retrieve all keys (or values) from a std::map and put them into a vector?
...unctionality away from the call site. Which can make maintenance a little more difficult.
I'm not sure if your goal is to get the keys into a vector or print them to cout so I'm doing both. You may try something like this:
std::map<int, int> m;
std::vector<int> key, value;
for(std::map...
Rails find_or_create_by more than one attribute?
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