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What's the difference between Perl's backticks, system, and exec?
...erlfunc, because it is a function.
E.g.:
#!/usr/bin/perl
print "Need to start exec command";
my $data2 = exec('ls');
print "Now END exec command";
print "Hello $data2\n\n";
In above code, there are three print statements, but due to exec leaving the script, only the first print statement is exe...
Split list into smaller lists (split in half)
...rn list[::2], list[1::2]
list[::2] gets every second element in the list starting from the 0th element.
list[1::2] gets every second element in the list starting from the 1st element.
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How to grab substring before a specified character jQuery or JavaScript
...3745515/… my answer is as accurate as the accepted answer, and works for starting indices other than 0.
– Mikey G
Aug 5 '15 at 20:53
...
Delete first character of a string in Javascript
...2 = s1.substring(1);
alert(s2); // shows "oobar"
To remove all 0's at the start of the string:
var s = "0000test";
while(s.charAt(0) === '0')
{
s = s.substring(1);
}
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C++ equivalent of java's instanceof
...Duration>
Duration instanceOfMeasurement(unsigned _loopCycles) {
auto start = std::chrono::high_resolution_clock::now();
volatile bool isInstanceOf = false;
for (unsigned i = 0; i < _loopCycles; ++i) {
Base *ptr = new Derived;
isInstanceOf = ptr->template instanceOf<Derived...
How to create ls in windows command prompt?
...t to your Path variable. Mine was located in C:\Program Files\Git\usr\bin.
Start a command prompt and enjoy ls in all its glory.
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Win32汇编--使用MASM - C/C++ - 清泛网 - 专注C/C++及内核技术
...>>>>>>>>>>>>>>>>>>>
code segment
assume cs:code,ds:data,ss:stack
start:
mov ax,data
mov ds,ax
mov ah,9
mov dx,offset szHello
int 21h
mov ah,4ch
int 21h
code ends
end start
在...
When is the thread pool used?
...ead pool) will be waiting for those queries to finish before they even get started
You can mitigate this by increasing the size of the thread pool through the UV_THREADPOOL_SIZE environment variable, so long as you do it before the thread pool is required and created: process.env.UV_THREADPOOL_SIZE ...
How can I use numpy.correlate to do autocorrelation?
...lation result array would be the greatest. However, the correlation is not starting at a time difference of 0. It starts at a negative time difference, closes to 0, and then goes positive. That is, you were expecting:
autocorrelation(a) = ∑ -∞ < i < ∞ aivt+i where 0 <= t < ∞ ...
Wrapping synchronous code into asynchronous call
...u need to do? Are there any front-end changes you can make instead - e.g., start the request and allow the user to do other work while it's processing?
I'll proceed with the assumption that yes, you really do need to make the individual request execute faster.
In this case, you'll need to execute ...