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What is the difference between \r and \n?
...ac) use just a LF character to indicate a newline.
Old (pre-OSX) Macintosh files used just a CR character to indicate a newline.
VMS, CP/M, DOS, Windows, and many network protocols still expect both: CR LF.
Old IBM systems that used EBCDIC standardized on NL--a character that doesn't even exist in ...
I need to pop up and trash away a “middle” commit in my master branch. How can I do it?
...In this case remove the line for the commit you want to erase and save the file. Rebase will finish its work.
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Difference between app.all('*') and app.use('/')
...r middleware is reached (which handles all the method routes... GET, POST, etc).
NOTICE: app.router has been deprecated in express 4.x
app.use() attaches to the application's main middleware stack, so it's used in the order specified by middleware. eg, if you put it first, it will be the fir...
How can I get stock quotes using Google Finance API?
...amp;q=AAPL,YHOO
You can also get charts: https://www.google.com/finance/getchart?q=YELP
Note that if your application is for public consumption, using the Google Finance API is against Google's terms of service.
Check google-finance-get-stock-quote-realtime for the complete code in python
...
Assign same value to multiple variables at once?
...y means $a = ( $b = ( $c = $d ) )
PHP passes primitive types int, string, etc. by value and objects by reference by default.
That means
$c = 1234;
$a = $b = $c;
$c = 5678;
//$a and $b = 1234; $c = 5678;
$c = new Object();
$c->property = 1234;
$a = $b = $c;
$c->property = 5678;
// $a,b,c-&g...
Rails :include vs. :joins
...oins => users to pull in all the user information for sorting purposes, etc it will work fine and take less time than :include, but say you want to display the comment along with the users name, email, etc. To get the information using :joins, it will have to make separate SQL queries for each u...
What is a good reason to use SQL views?
...gregated tables, where the database engine aggregates
data (sum, average etc) and presents the calculated results as part of the data
Views can hide the complexity of data; for example a view could appear as
Sales2000 or Sales2001, transparently partitioning the actual underlying table
Views tak...
Static method in a generic class?
...oid doIt(T object) {
System.out.println("shake that booty '" + object.getClass().toString()
+ "' !!!");
}
private static class KC {
}
private static class SunshineBand {
}
public static void main(String args[]) {
KC kc = new KC();
SunshineBand sunshi...
What is a semaphore?
... resource
That is, a mutex can be used to syncronize access to a counter, file, database, etc.
A sempahore can do the same thing but supports a fixed number of simultaneous callers. For example, I can wrap my database calls in a semaphore(3) so that my multithreaded app will hit the database with ...
Best design for a changelog / auditing database table? [closed]
...ifferent change log/auditing
(when something was added, deleted, modified, etc). I don't need to store particularly detailed info, so I was thinking something along the lines of:
...