大约有 30,000 项符合查询结果（耗时：0.0492秒） [XML]
What is the difference between typeof and instanceof and when should one be used vs. the other?
...han strings. Type comparison is less prone to human error, and it's technically faster since it's comparing pointers in memory rather than doing whole string comparisons.
share
|
improve this answe...
How to update the value stored in Dictionary in C#?
...tten, it can work fine in tests and with other test data where the .Add is called twice for the same key it will throw an exception.
– Philm
Jan 14 '17 at 9:52
...
Unique BooleanField value in Django?
...
Whenever I've needed to accomplish this task, what I've done is override the save method for the model and have it check if any other model has the flag already set (and turn it off).
class Character(models.Model):
name = models.CharField(max_length=255)
is_the_chosen_one = models.Boo...
Difference between binary semaphore and mutex
... If Task B attempts to semGive a mutex currently held by Task A, Task B's call will return an error and fail.
Mutexes always use the following sequence:
- SemTake
- Critical Section
- SemGive
Here is a simple example:
Thread A Thread B
Take Mutex
access d...
Difference between single quotes and double quotes in Javascript [duplicate]
... "It's alright"; // single quote inside double quotes var answer = "He is called 'Johnny'"; // single quotes inside double quotes var answer = 'He is called "Johnny"'; // double quotes inside single quotes
– broadband
Mar 5 '15 at 11:26
...
Node.js Unit Testing [closed]
...
Nodeunit is a bit strange with requiring every test to call .done() imho.
– Kos
Nov 6 '12 at 12:53
2
...
How do I use a custom deleter with a std::unique_ptr member?
...e can't specialize to the specific function, only the signature), and must call the function through the pointer (more costly than direct call). Both rici and Deduplicator's answers avoid all of these costs by specializing to a functor.
– ShadowRanger
Nov 21 '1...
How do I get monitor resolution in Python?
...ct if DPI scaling is used (ie: often the case on 4k displays), you have to call SetProcessDPIAware before initializing the GUI components (and not before calling the GetSystemMetrics function). This is true for most of the answers here (GTK, etc) on the win32 platform.
– totaam...
How to capitalize the first letter of a String in Java?
...ll lower case, or all you need is to initialize the first letter, directly call
StringUtils.capitalize(yourString);
If you want to make sure that only the first letter is capitalized, like doing this for an enum, call toLowerCase() first and keep in mind that it will throw NullPointerException if t...
Solution for “Fatal error: Maximum function nesting level of '100' reached, aborting!” in PHP
...
Rather than going for a recursive function calls, work with a queue model to flatten the structure.
$queue = array('http://example.com/first/url');
while (count($queue)) {
$url = array_shift($queue);
$queue = array_merge($queue, find_urls($url));
}
function...