大约有 46,000 项符合查询结果（耗时：0.0868秒） [XML]
?: operator (the 'Elvis operator') in PHP
...
It evaluates to the left operand if the left operand is truthy, and the right operand otherwise.
In pseudocode,
foo = bar ?: baz;
roughly resolves to
foo = bar ? bar : baz;
or
if (bar) {
foo = bar;
} else {
foo = baz;
}
with the differe...
How to create a new (and empty!) “root” branch?
...answered Oct 24 '17 at 16:57
Mr_and_Mrs_DMr_and_Mrs_D
25.3k2929 gold badges149149 silver badges304304 bronze badges
...
How to synchronize a static variable among threads running different instances of a class in Java?
...
The reason #3 is the best is that any random bit of code could synchronize on Test.class and potentially spoil your day. Also, class initialization runs with a lock on the class held, so if you've got crazy class initializers you can give yourself headaches. vol...
Scala: What is the difference between Traversable and Iterable traits in Scala collections?
I have looked at this question but still don't understand the difference between Iterable and Traversable traits. Can someone explain ?
...
Copying files using rsync from remote server to local machine
Once I've ssh'd into my remote server, what would the command be to copy all files from a directory to a local directory on my machine?
...
Does setting Java objects to null do anything anymore?
I was browsing some old books and found a copy of "Practical Java" by Peter Hagger. In the performance section, there is a recommendation to set object references to null when no longer needed.
...
Ruby on Rails patterns - decorator vs presenter
...all sorts of talk lately in the Ruby on Rails community about decorators and presenters.
2 Answers
...
iOS app with framework crashed on device, dyld: Library not loaded, Xcode 6 Beta
...
I have the framework in the Embedded Binaries and I have the Copy Phase as well set to "Frameworks". It crashes anyways.
– loretoparisi
Sep 18 '14 at 10:22
...
GitHub: Reopening a merged pull request
I've now fixed the bug and want to resubmit the pull request with 1 extra commit. Is there any way to reopen the pull request or update it, or do I have to create a new pull request, type out the description etc again? Gitorious has this feature and we've recently moved to GitHub.
...
Styling text input caret
...e caret of a focused <input type='text'/> . Specifically, the color and thickness.
5 Answers
...