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Algorithm to get the excel-like column name of a number
...recursive function (Based on zero indexed numbers, meaning 0 == A, 1 == B, etc)...
function getNameFromNumber($num) {
$numeric = $num % 26;
$letter = chr(65 + $numeric);
$num2 = intval($num / 26);
if ($num2 > 0) {
return getNameFromNumber($num2 - 1) . $letter;
} else ...
Why is String immutable in Java?
...ring in network connections, database connection urls, usernames/passwords etc. If it were mutable, these parameters could be easily changed.
Synchronization and concurrency: making String immutable automatically makes them thread safe thereby solving the synchronization issues.
Caching: when compi...
Can I “multiply” a string (in C#)?
... the scenes, then mutates it. It doesn't work like a regular List<T> etc.
– Marc Gravell♦
Feb 10 '09 at 16:05
1
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How do I extract the contents of an rpm?
... the example below:
$ rpm2cpio php-5.1.4-1.esp1.x86_64.rpm | cpio -idmv
/etc/httpd/conf.d/php.conf
./etc/php.d
./etc/php.ini
./usr/bin/php
./usr/bin/php-cgi
etc
share
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improve this an...
How do I check whether a file exists without exceptions?
... exists(). Here is some simple REPL output:
>>> os.path.isfile("/etc/password.txt")
True
>>> os.path.isfile("/etc")
False
>>> os.path.isfile("/does/not/exist")
False
>>> os.path.exists("/etc/password.txt")
True
>>> os.path.exists("/etc")
True
>>>...
How do I return multiple values from a function? [closed]
...g (or too simplistic).
Returning a dictionary with keys "y0", "y1", "y2", etc. doesn't offer any advantage over tuples. Returning a ReturnValue instance with properties .y0, .y1, .y2, etc. doesn't offer any advantage over tuples either. You need to start naming things if you want to get anywhere, a...
Query EC2 tags from within instance
...NCE_ID" --output=text | sed -r 's/TAGS\t(.*)\t.*\t.*\t(.*)/\1="\2"/' > /etc/ec2-tags
You need the AWS CLI tools installed on your system: you can either install them with a packages section in a cloud-config file before the script, use an AMI that already includes them, or add an apt or yum com...
How to edit multi-gigabyte text files? Vim doesn't work =( [closed]
...ndle large files pretty well. I just edited a 3.4GB file, deleting lines, etc. Three things to keep in mind:
Press Ctrl-C: Vim tries to read in the whole file initially, to do things like syntax highlighting and number of lines in file, etc. Ctrl-C will cancel this enumeration (and the syntax ...
Is PowerShell ready to replace my Cygwin shell on Windows? [closed]
...n PowerShell, or just stick with Cygwin /Perl scripts/Unix shell scripts, etc.
18 Answers
...
What is the difference between require and require-dev sections in composer.json?
...oding style issues)
phpunit/phpunit (to drive the development using tests)
etc.
Deployment
Now, in development and testing environments, you would typically run
$ composer install
to install both production and development dependencies.
However, in staging and production environments, you onl...