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Difference between string and text in rails?
I'm making a new web app using Rails, and was wondering, what's the difference between string and text ? And when should each be used?
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.gitignore for PhoneGap/Cordova 3.0 projects - what should I commit?
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The answer depends on wich platforms you're developing the phongap app, and if you're following the standard directory structure.
If your project directory structure is standard, then you can start from this gitignore and modify it for your needs.
On a rule of thumb you've to exclude all genera...
Scalar vs. primitive data type - are they the same thing?
...ticles I have read, there are sometimes references to primitive data types and sometimes there are references to scalars.
7...
source of historical stock data [closed]
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Let me add my 2¢, it's my job to get good and clean data for a hedge-fund, I've seen quite a lot of data feeds and historical data providers. This is mainly about US stock data.
To start with, if you have some money don't bother with downloading data from Yahoo, get...
jQuery: Return data after ajax call success [duplicate]
... it's waiting for the response.
You can pass in a callback function that handles the result:
function testAjax(handleData) {
$.ajax({
url:"getvalue.php",
success:function(data) {
handleData(data);
}
});
}
Call it like this:
testAjax(function(output){
// here you use t...
Keep file in a Git repo, but don't track changes
...t solution to do this. First change the file you do not want to be tracked and use the following command:
git update-index --assume-unchanged FILE_NAME
and if you want to track the changes again use this command:
git update-index --no-assume-unchanged FILE_NAME
git-update-index documentation...
Should I declare Jackson's ObjectMapper as a static field?
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Yes, that is safe and recommended.
The only caveat from the page you referred is that you can't be modifying configuration of the mapper once it is shared; but you are not changing configuration so that is fine. If you did need to change conf...
virtualenv --no-site-packages and pip still finding global packages?
...on that virtualenv --no-site-packages would create a completely separate and isolated Python environment, but it doesn't seem to.
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What does static_assert do, and what would you use it for?
...n example where static_assert(...) ('C++11') would solve the problem in hand elegantly?
8 Answers
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Get a specific bit from byte
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Easy. Use a bitwise AND to compare your number with the value 2^bitNumber, which can be cheaply calculated by bit-shifting.
//your black magic
var bit = (b & (1 << bitNumber-1)) != 0;
EDIT: To add a little more detail because there ...