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What is the difference between $(command) and `command` in shell programming?
...need to be seen as deprecated, e.g. the use of waitpid() that prevents you from from seeing the full 32 bits from the exit() parameter, but all shells except the recent Bourne Shell still use waitpid() instead of the waitid() call that is now available since 26 years.
– schily
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How to check whether an array is empty using PHP?
... create an array with database column names as the keys but no values/data from the database), then the array will NOT be empty().
In this case, you can loop the array in a foreach, testing if each key has a value. This is a good method if you need to run through the array anyway, perhaps checkin...
Determine if a function exists in bash
Currently I'm doing some unit tests which are executed from bash. Unit tests are initialized, executed and cleaned up in a bash script. This script usualy contains an init(), execute() and cleanup() functions. But they are not mandatory. I'd like to test if they are or are not defined.
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Check if a JavaScript string is a URL
...ed question with an answer:
Javascript regex URL matching
Or this Regexp from Devshed:
function validURL(str) {
var pattern = new RegExp('^(https?:\\/\\/)?'+ // protocol
'((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|'+ // domain name
'((\\d{1,3}\\.){3}\\d{1,3}))'+ // OR ip (v4) addre...
How to check if character is a letter in Javascript?
... The code only tests whether the character is one of the basic letter from a to z (very few languages are written using only those letters). This is very different from the Java function that was mentioned.
– Jukka K. Korpela
Mar 25 '12 at 19:19
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Where to store global constants in an iOS application?
... @AnsonYao usually when that happens to me I forgot to remove a semicolon from the #define, such as #define kBaseURL @"http://192.168.0.123/";
– Gyfis
Apr 11 '15 at 22:13
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AngularJS performs an OPTIONS HTTP request for a cross-origin resource
...ates that browsers
"preflight" the request, soliciting supported methods from the server
with an HTTP OPTIONS request header, and then, upon "approval" from
the server, sending the actual request with the actual HTTP request
method. Servers can also notify clients whether "credentials"
(i...
“message failed to fetch from registry” while trying to install any module
I can't install any node module from the npm.
14 Answers
14
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What is the Python equivalent of static variables inside a function?
...e function is called and not when the module is executed or when something from it is imported, which is the case if you use the decorator approach from the currently accepted answer. See Python decorator function execution. If you have a huge library module then every decorator will be run, includi...
Extract a part of the filepath (a directory) in Python
......
And you can continue doing this as many times as necessary...
Edit: from os.path, you can use either os.path.split or os.path.basename:
dir = os.path.dirname(os.path.dirname(file)) ## dir of dir of file
## once you're at the directory level you want, with the desired directory as the final p...