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Why would a JavaScript variable start with a dollar sign? [duplicate]
... common use in jQuery is to distinguish jQuery objects stored in variables from other variables.
For example, I would define:
var $email = $("#email"); // refers to the jQuery object representation of the dom object
var email_field = $("#email").get(0); // refers to the dom object itself
I fin...
git branch -d gives warning
...if it was a fast-forward, this will generate a new SHA for each new commit from origin/old_branch, causing git to see the original SHA's in your local old_branch as unmerged after pulling the changes to your local master branch. You can see this answer and this answer for why this occurs.
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How to check version of python modules?
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Python >= 3.8:
If you're on python >=3.8 you can use a module from the built-in library for that. To check a package's version (in this example construct) run:
>>> from importlib.metadata import version
>>> version('construct')
'4.3.1'
Python < 3.8:
Use pkg_resourc...
Fastest way to convert string to integer in PHP
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integer excract from any string
$in = 'tel.123-12-33';
preg_match_all('!\d+!', $in, $matches);
$out = (int)implode('', $matches[0]);
//$out ='1231233';
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Run certain code every n seconds [duplicate]
...eneralization of Alex Martelli's answer, with start() and stop() control:
from threading import Timer
class RepeatedTimer(object):
def __init__(self, interval, function, *args, **kwargs):
self._timer = None
self.interval = interval
self.function = function
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Get escaped URL parameter
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Below is what I have created from the comments here, as well as fixing bugs not mentioned (such as actually returning null, and not 'null'):
function getURLParameter(name) {
return decodeURIComponent((new RegExp('[?|&]' + name + '=' + '([^&;...
How do I format a string using a dictionary in python-3.x?
...[longitude]}'.format(geopoint)
'The title is {0.title}s'.format(a) # the a from your first example
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Batch renaming files with Bash
... didn't work for me, would be glad to get your help.... The suffix of the FROM file is appended to the TO file: $find . -type d | sed -n 's/(.*)\/(.*)anysoftkeyboard(.*)/mv "\1\/\2anysoftkeyboard\3" "\1\/\2effectedkeyboard\3"/p'|sh >>>>>>>OUTPUT>>>> mv: rename ./bas...
How to print to console using swift playground?
...ing that writes to the console, including Swift's print statement (renamed from println in Swift 2 beta) shows up there.
In earlier Xcode 6 versions (which by now you probably should be upgrading from anyway), show the Assistant editor (e.g. by clicking the little circle next to a bit in the output...
What is the exact meaning of Git Bash?
...OW64\cmd.exe /c ""C:\Prog\Git\1.7.1\bin\sh.exe" --login -i"
This differs from git-cmd.bat, which provides git commands in a plain DOS command prompt.
A tool like GitHub for Windows (G4W) provides different shell for git (including a PowerShell one)
Update April 2015:
Note: the git bash in msy...