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How to verify if a file exists in a batch file?
... If no date is given, copies only those files whose
source time is newer than the destination time.
/H Copies hidden and system files also.
/E Copies directories and subdirectories, including empty ones.
Same as /S /E. May be used to modify /T.
...
Getting HTTP code in PHP using curl
...ck to check server side. For example, doing this first could save a lot of time:
if(!$url || !is_string($url) || ! preg_match('/^http(s)?:\/\/[a-z0-9-]+(.[a-z0-9-]+)*(:[0-9]+)?(\/.*)?$/i', $url)){
return false;
}
Make sure you only fetch the headers, not the body content:
@curl_setopt($ch, C...
How can I open multiple files using “with open” in Python?
I want to change a couple of files at one time, iff I can write to all of them. I'm wondering if I somehow can combine the multiple open calls with the with statement:
...
How do you check if a JavaScript Object is a DOM Object?
...on us to invest days or weeks working around their refusal to get with the times.
– mopsyd
May 9 '18 at 4:27
1
...
IEnumerable to string [duplicate]
...egate(new StringBuilder(), (seed, c) => seed.Append(c)).ToString();
I timed this using the same tests that Jeff Mercado used and this was 1 second slower across 1,000,000 iterations on the same 300 character sequence (32-bit release build) than the more explicit:
static string StringBuilderCha...
How are msys, msys2, and msysgit related to each other?
...io C Hamano -- gitster -- in commit 116a866, 29 Jan 2016)
For a long time, Git for Windows lagged behind Git's 2.x releases because the Git for Windows developers wanted to let that big jump coincide with a well-needed jump away from MSys to MSys2.
To understand why this is such a big iss...
Event system in Python
...andlers on the actual Event
object (or handlers list). So at registration time the event already needs to exist.
That's why the second style of event systems exists: the
publish-subscribe pattern.
Here, the handlers don't register on an event object (or handler list), but on a central dispatcher.
A...
Variable number of arguments in C++?
... but with the advantages to:
be strongly type safe;
work without the run-time information of the number of arguments, or without the usage of a "stop" argument.
Here is an example for mixed argument types
template<class... Args>
void print(Args... args)
{
(std::cout << ... <&...
How to check if an email address exists without sending an email?
...
There are two methods you can sometimes use to determine if a recipient actually exists:
You can connect to the server, and issue a VRFY command. Very few servers support this command, but it is intended for exactly this. If the server responds with a 2.0.0...
is node.js' console.log asynchronous?
... and asynchronous when it's a pipe (to avoid blocking for long periods of time).
That is, in the following example, stdout is non-blocking while stderr is blocking:
$ node script.js 2> error.log | tee info.log
In daily use, the blocking/non-blocking dichotomy is not something you shou...