大约有 40,000 项符合查询结果（耗时：0.0690秒） [XML]
Why is processing a sorted array faster than processing an unsorted array?
...less.
Further reading: "Branch predictor" article on Wikipedia.
As hinted from above, the culprit is this if-statement:
if (data[c] >= 128)
sum += data[c];
Notice that the data is evenly distributed between 0 and 255. When the data is sorted, roughly the first half of the iterations will no...
PHP: exceptions vs errors?
...
Nice code, thanks. I don't get where the class X comes from though, and what its purpose is?
– Alec
Jun 9 '09 at 0:00
...
What kind of Garbage Collection does Go use?
...least have predictable and controllable heap growth behavior.
(Photo from GopherCon 2015 presentation "Go GC: Solving the Latency Problem in Go 1.5")
The sole tuning knob for the STW collector was “GOGC”, the relative heap growth between collections. The default setting, 100%, triggered g...
Finding what methods a Python object has
...I believe that what you want is something like this:
a list of attributes from an object
In my humble opinion, the built-in function dir() can do this job for you. Taken from help(dir) output on your Python Shell:
dir(...)
dir([object]) -> list of strings
If called without an argument, retu...
How do I return early from a rake task?
... at the beginning, if one of the checks fails I would like to return early from the rake task, I don't want to execute any of the remaining code.
...
Animate scrollTop not working in firefox
...ght be more straight-forward to enforce that the callback is only run once from within the callback:
function runOnce(fn) {
var count = 0;
return function() {
if(++count == 1)
fn.apply(this, arguments);
};
};
$('body, html').animate({ scrollTop: stop }, delay, ru...
What is the proper way to re-throw an exception in C#? [duplicate]
I have a question for you that stems from my partner doing things a different way than I do.
9 Answers
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Calculate the execution time of a method
I have an I/O time-taking method which copies data from a location to another. What's the best and most real way of calculating the execution time? Thread ? Timer ? Stopwatch ? Any other solution? I want the most exact one, and briefest as much as possible.
...
What is the fastest way to compare two sets in Java?
...a boolean, not another Set. The elements in secondSet are actually removed from firstSet and true is returned if a change has been made.
– Richard Corfield
Oct 21 '12 at 20:30
4
...
isset() and empty() - what to use
...y array)
var $var; (a variable declared, but without a value in a class)
From http://php.net/manual/en/function.empty.php
As mentioned in the comments the lack of warning is also important with empty()
PHP Manual says
empty() is the opposite of (boolean) var, except that no warning is
ge...