大约有 47,000 项符合查询结果（耗时：0.0658秒） [XML]
I need to pop up and trash away a “middle” commit in my master branch. How can I do it?
... the history is not rewritten, you maintain a clear record of the mistake, and other repos will accept the push.
Here's a good way to erase: git rebase -i <commit>^
That takes you to the commit just before the one you want to remove. The interactive editor will show you a list of all the comm...
Express.js: how to get remote client address
I don't completely understand how I should get a remote user IP address.
16 Answers
16...
When should I really use noexcept?
...r every function declaration would greatly reduce programmer productivity (and frankly, would be a pain).
Well, then use it when it's obvious that the function will never throw.
When can I realistically expect to observe a performance improvement after using noexcept? [...] Personally, I care ...
How do HashTables deal with collisions?
...ll full then the hash table can increase the number of buckets that it has and then redistribute all the elements in the table. The hash function returns an integer and the hash table has to take the result of the hash function and mod it against the size of the table that way it can be sure it will...
Can you have if-then-else logic in SQL? [duplicate]
...
The CASE statement is the closest to an IF statement in SQL, and is supported on all versions of SQL Server:
SELECT CASE <variable>
WHEN <value> THEN <returnvalue>
WHEN <othervalue> THEN <returnthis>
ELSE <retur...
How to verify a user's password in Devise
...se gem in rails. User password stored on my db which is encrypted_password and i am trying to find user by password, but I don't understand how to match password from form and encrypted_password in my db.
...
Delete a closed pull request from GitHub
I accidentally made a wrong pull request and ended up closing the request myself. It's in a closed state right now but it's accessible via direct URL and showing on my activity bar.
...
Ways to save Backbone.js model data?
I am more into front end development and have recently started exploring Backbone.js into my app. I want to persist the model data to the server.
...
What is the difference between build.sbt and build.scala?
I started to learn Scala and almost in every tutorial I see a build.sbt file which describes project settings. But now I have installed giter8 and created a project from template. And generated project from template missed build.sbt file, but it have build.scala (which seems used for same pu...
Drop data frame columns by name
...DF) %in% drops)]
Or, alternatively, you can make a list of those to keep and refer to them by name :
keeps <- c("y", "a")
DF[keeps]
EDIT :
For those still not acquainted with the drop argument of the indexing function, if you want to keep one column as a data frame, you do:
keeps <- "y"
...