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Code for a simple JavaScript countdown timer?
I want to use a simple countdown timer starting at 30 seconds from when the function is run and ending at 0. No milliseconds. How can it be coded?
...
Is MATLAB OOP slow or am I doing something wrong?
... each function/method 100000 times
nop() function: 0.02261 sec 0.23 usec per call
nop1-5() functions: 0.02182 sec 0.22 usec per call
nop() subfunction: 0.02244 sec 0.22 usec per call
@()[] anonymous function: 0.08461 sec 0.85 usec per call
nop(o...
Python string class like StringBuilder in C#?
...).
Here is the result for 10,000 iterations:
method1: 0.0538418292999 secs
process size 4800 kb
method2: 0.22602891922 secs
process size 4960 kb
method3: 0.0605459213257 secs
process size 4980 kb
method4: 0.0544030666351 secs
process size 5536 kb
method5: 0.0551080703735 secs
process size 5...
NOT IN vs NOT EXISTS
...o null.
This post explains it very well
http://sqlinthewild.co.za/index.php/2010/02/18/not-exists-vs-not-in/
When the subquery returns even one null, NOT IN will not match any
rows.
The reason for this can be found by looking at the details of what the
NOT IN operation actually means...
How to measure time in milliseconds using ANSI C?
Using only ANSI C, is there any way to measure time with milliseconds precision or more? I was browsing time.h but I only found second precision functions.
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std::vector performance regression when enabling C++11
... ( +- 1.75% )
4 context-switches # 0.116 K/sec ( +- 5.69% )
0 CPU-migrations # 0.006 K/sec ( +- 66.67% )
19,801 page-faults # 0.559 M/sec
99,02...
【解决】Linux mysql如何重置root密码？ - 更多技术 - 清泛网 - 专注C/C++及内核技术
...密码，如无意外，你应该可以正常登录到数据库中。
php,mysql,root
How do I measure execution time of a command on the Windows command line?
...Output:
Days : 0
Hours : 0
Minutes : 0
Seconds : 0
Milliseconds : 0
Ticks : 1318
TotalDays : 1.52546296296296E-09
TotalHours : 3.66111111111111E-08
TotalMinutes : 2.19666666666667E-06
TotalSeconds : 0.0001318
Tot...
How do you trigger a block after a delay, like -performSelector:withObject:afterDelay:?
...er1 = 12;
float parameter2 = 144.1;
// Delay execution of my block for 10 seconds.
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 10 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
NSLog(@"parameter1: %d parameter2: %f", parameter1, parameter2);
});
More: https://developer.apple.com/documenta...
How can strings be concatenated?
...
The easiest way would be
Section = 'Sec_' + Section
But for efficiency, see: https://waymoot.org/home/python_string/
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