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string.IsNullOrEmpty(string) vs. string.IsNullOrWhiteSpace(string)
...code data. As always, premature
optimization may be evil, but it is also fun.
Reference : Here
Check the source code (Reference Source .NET Framework 4.6.2)
IsNullorEmpty
[Pure]
public static bool IsNullOrEmpty(String value) {
return (value == null || value.Length == 0);
}
IsNullOrWhit...
How can I create a self-signed cert for localhost?
... Also you can automate the process completely by adding -subj '/CN=localhost' to the openssl arguments.
– Félix Saparelli
Jan 3 '16 at 7:16
8
...
Why are hexadecimal numbers prefixed with 0x?
...d parse these as octal, mangling the number before storing. To add to the fun, one popular database product would silently switch back to decimal parsing if the number contained an 8 or 9.
– Basic
Nov 24 '15 at 19:45
...
Increasing the maximum number of TCP/IP connections in Linux
...k
;;
'Linux')
AWK=/bin/awk
;;
'AIX')
AWK=/usr/bin/awk
;;
esac
netstat -an | $AWK -v start=1 -v end=65535 ' $NF ~ /TIME_WAIT|ESTABLISHED/ && $4 !~ /127\.0\.0\.1/ {
if ($1 ~ /\./)
{sip=$1}
else {sip=$4}
...
javascript: Clear all timeouts?
...egers.
So you may clear all timeouts like so:
var id = window.setTimeout(function() {}, 0);
while (id--) {
window.clearTimeout(id); // will do nothing if no timeout with id is present
}
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Alarm 闹钟扩展 · App Inventor 2 中文网
...
Alarm 闹钟扩展
下载
.aix拓展文件：
de.ullisroboterseite.ursai2alarm.aix
.aia示例文件：
UrsAlarmTest.aia
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1.0 (2021-04-26)
初...
How to run functions in parallel?
...both to finish at critical synchronization points using Process.join like @aix's answer mentions.
This is better than time.sleep(10) because you can't guarantee exact timings. With explicitly waiting, you're saying that the functions must be done executing that step before moving to the next, inst...
Can I call a base class's virtual function if I'm overriding it?
... // ...
void printStuff() {
Foo::printStuff(); // calls base class' function
}
};
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what is the basic difference between stack and queue?
... of the queue and when one leaves they leave from the front of the queue.
Fun fact: the British refer to lines of people as a Queue
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Does Python support short-circuiting?
...hort-circuiting behavior in operator and, or:
Let's first define a useful function to determine if something is executed or not. A simple function that accepts an argument, prints a message and returns the input, unchanged.
>>> def fun(i):
... print "executed"
... return i
...
...