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Is there a performance difference between a for loop and a for-each loop?
...nt e : elements) {
doSomething(e);
}
When you see the colon (:), read it as
“in.” Thus, the loop above reads as
“for each element e in elements.” Note
that there is no performance penalty
for using the for-each loop, even for
arrays. In fact, it may offer a slight
perfo...
SQL: IF clause within WHERE clause
...
@Kash the link you provided is a register-to-read, is there any publicly available documenation that describes what you are saying?
– Steve
Mar 14 '13 at 19:26
...
PHP script to loop through all of the files in a directory?
.../to/files";
if ($handle = opendir($path)) {
while (false !== ($file = readdir($handle))) {
if ('.' === $file) continue;
if ('..' === $file) continue;
// do something with the file
}
closedir($handle);
}
?>
...
Changing user agent on urllib2.urlopen
...lib2.Request('www.example.com', None, headers)
html = urllib2.urlopen(req).read()
Or, a bit shorter:
req = urllib2.Request('www.example.com', headers={ 'User-Agent': 'Mozilla/5.0' })
html = urllib2.urlopen(req).read()
sh...
How can I add numbers in a Bash script?
...b directly, no need to ls
echo "$j"
# 'grep' can read files, no need to use 'cat'
metab=$(grep EndBuffer "$j" | awk '{sum+=$2} END { print sum/120}')
num=$(( $num + $metab ))
done
echo "$num"
done
As described in Bash FAQ 022, Bash does not...
How do I serialize an object and save it to a file in Android?
...s = new ObjectInputStream(fis);
SimpleClass simpleClass = (SimpleClass) is.readObject();
is.close();
fis.close();
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物联网入门 · App Inventor 2 中文网
...数据
新建过程 updateDataLabel，将 LabelData.文本 设置为：
Reading: X [Accel_X] Y [Accel_Y] Z [Accel_Z]
9. 接收数据事件
加入 当 Arduino101Accelerometer1.AccelerometerDataReceived，把三个参数分别存入全局变量，然后调用 updateDataLabel。
10. 测试加...
/etc/apt/sources.list" E212: Can't open file for writing
... of how to save those changes:
One time Setup demo to create a root owned read only file for a lower user:
sudo touch temp.txt
sudo chown root:root temp.txt
sudo chmod 775 temp.txt
whoami
el
First open the file as normal user:
vi temp.txt
Then make some changes to the file, it warns you its r...
How to choose between Hudson and Jenkins? [closed]
...f the core developers, the community, and (so far) much more actual work.
Read that post I linked up top, then read the rest of these in chronological order. For balance you can read the Hudson/Oracle take on it. It's pretty clear to me who is playing defensive and who has real intentions for the ...
Play audio with Python
...
Reading this made me so emotional. My eyes literally teared up with happiness. Did not expect that kind of reaction from myself. (They linked to a module I made.)
– ArtOfWarfare
Jan 24 '...