大约有 15,600 项符合查询结果（耗时：0.0322秒） [XML]
How do I know if a generator is empty from the start?
Is there a simple way of testing if the generator has no items, like peek , hasNext , isEmpty , something along those lines?
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Grep characters before and after match?
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grep -E -o ".{0,5}test_pattern.{0,5}" test.txt
This will match up to 5 characters before and after your pattern. The -o switch tells grep to only show the match and -E to use an extended regular expression. Make sure to put the quotes aroun...
What is the “double tilde” (~~) operator in JavaScript? [duplicate]
...hod. They run in about 0.2 microseconds instead of 0.5 microseconds when I test it in Firefox on my computer. That means that you need to use it a lot before it's noticable. In a functon like the one in the OP it's just micro optimisation, and only makes the code harder to follow.
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What's the most efficient way to test two integer ranges for overlap?
... [y1:y2], where x1 ≤ x2 and y1 ≤ y2, what is the most efficient way to test whether there is any overlap of the two ranges?
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How do I assign a port mapping to an existing Docker container?
...rdings, I always follow these steps,
stop running container
docker stop test01
commit the container
docker commit test01 test02
NOTE: The above, test02 is a new image that I'm constructing from the test01 container.
re-run from the commited image
docker run -p 8080:8080 -td test02
Where t...
Returning unique_ptr from functions
...t has been given to that function.
The example could be like this:
class Test
{int i;};
std::unique_ptr<Test> foo1()
{
std::unique_ptr<Test> res(new Test);
return res;
}
std::unique_ptr<Test> foo2(std::unique_ptr<Test>&& t)
{
// return t; // this will p...
Soft hyphen in HTML ( vs. ­)
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@gclj5 I just tested find on a &shy; word in Chrome v21, and it correctly ignores the soft hyphen. Not sure about IE, FF and other browsers though.
– evanrmurphy
Oct 23 '12 at 21:01
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Map vs Object in JavaScript
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My tests in Chrome showed that maps to not use any significant amount more memory for maintaining order. I thing there was 0.1KB more for a million keys and I don't think that was for maintaining order. However, that ~0.1KB seem...
Validating email addresses using jQuery and regex
...F]*[a-z\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])\.?$/i;
return pattern.test(emailAddress);
}
if( !isValidEmailAddress( emailaddress ) ) { /* do stuff here */ }
NOTE: keep in mind that no 100% regex email check exists!
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jQuery attr vs prop?
...his isn't just another What's the difference question , I have done some tests(http://jsfiddle.net/ZC3Lf/) modifying the prop and attr of <form action="/test/"></form> with the output being:
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