大约有 45,000 项符合查询结果（耗时：0.0401秒） [XML]
Is there a null-coalescing (Elvis) operator or safe navigation operator in javascript?
...ame = (user && user.address && user.address.street) || "Unknown Street";
share
|
improve this answer
|
follow
|
...
How to validate an email address in JavaScript
... here you have another RFC 2822 compliant regex
The official standard is known as RFC 2822. It describes the syntax that valid email addresses must adhere to. You can (but you shouldn't — read on) implement it with this regular expression:
(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'...
Remove spaces from std::string in C++
...ithm remove_if and isspace:
remove_if(str.begin(), str.end(), isspace);
Now the algorithm itself can't change the container(only modify the values), so it actually shuffles the values around and returns a pointer to where the end now should be. So we have to call string::erase to actually modify ...
Testing two JSON objects for equality ignoring child order in Java
... This is the best answer ever. Not only it answers my question now, as it also answers almost every object comparison we need to do. thanks, joshu.
– Luiz Feijão Veronesi
Aug 31 '17 at 2:14
...
Django FileField with upload_to determined at runtime
...posed to having everyone's files go to MEDIA_ROOT. The problem is I don't know how to define this in the model. Here is how it currently looks:
...
How can I scale an image in a CSS sprite
...
hi @Robert. How about now?
– Tomasz Mularczyk
Aug 23 '17 at 6:32
...
How to set -source 1.7 in Android Studio and Gradle
...
Java 7 support was added at build tools 19. You can now use features like the diamond operator, multi-catch, try-with-resources, strings in switches, etc. Add the following to your build.gradle.
android {
compileSdkVersion 19
buildToolsVersion "19.0.0"
defaultCon...
Automatically capture output of last command into a variable using Bash?
...
I don't know of any variable that does this automatically. To do something aside from just copy-pasting the result, you can re-run whatever you just did, eg
vim $(!!)
Where !! is history expansion meaning 'the previous command'.
I...
Cast Object to Generic Type for returning
...
I know it's from the OP, but really { catch(ClassCastException e) { return null; } is unforgiveable
– artbristol
Jan 25 '13 at 16:38
...
Database sharding vs partitioning
... multiple instances or servers, using some kind of logic or identifier to know which instance or server to look for the data. An identifier of this kind is often called a "Shard Key".
A common, key-less logic is to use the alphabet to divide the data. A-D is instance 1, E-G is instance 2 etc. Custo...