大约有 23,000 项符合查询结果（耗时：0.0431秒） [XML]
'git branch -av' showing remote branch that no longer exists
...my local i was seeing weird branches which had no connection with the code base repo .when i ran this command , it tuned my local origin branch and then i added upstream master .thanks
– Ankur Srivastava
Sep 14 '17 at 1:16
...
Should you always favor xrange() over range()?
... object in Python2. I think what you meant to say is that you can do index-based comprehension (if that makes sense) better with range as opposed to xrange. Range is handy very seldom, I think
– dylnmc
Nov 12 '14 at 0:34
...
Is it possible to define more than one function per file in MATLAB, and access them from outside tha
...rt x from y" way of doing things)
function message = makefuns
assignin('base','fun1',@fun1);
assignin('base','fun2',@fun2);
message='Done importing functions to workspace';
end
function y=fun1(x)
y=x;
end
function z=fun2
z=1;
end
And then used thusly:
>> makefuns
ans =
Done imp...
LINQ query to select top five
...
This seems to take as many results from the database as match the equality conditions, and only after they are taken from the database does it apply the take(5) restriction within the application. Is there a way to literally take only the first 5 rows from the database?
...
How to delete a row by reference in data.table?
... of the table would still be quite inefficient compared to a row store database such as SQL, which is more suited for fast insert and delete of rows wherever those rows are in the table. But still, it would be a lot faster than copying a new large object without the deleted rows.
On the other hand,...
System.currentTimeMillis vs System.nanoTime
...e number of seconds past the epoch. It may be a "wall clock" but it is one based on UTC. You must determine based on your timezone and DST settings what that translates to for your local time (or use other Java utilities to do that for you).
– Shadow Man
Jan 24...
Ruby Metaprogramming: dynamic instance variable names
...
@Andrew: Struct.new creates a new class based on the hash keys, and then the second new makes the first object of the just-created class, initializing it to the values of the Hash. See ruby-doc.org/core-1.8.7/classes/Struct.html
– DigitalRoss...
npm failed to install time with make not found error
...
I had the same problem using Docker, both on CENTOS 7 and RHEL 7 base images... do the following:
RUN yum install -y make gcc*
Worked perfectly for me!
share
|
improve this answer
...
Is there a regular expression to detect a valid regular expression?
...his is a recursive regex, and is not supported by many regex engines. PCRE based ones should support it.
Without whitespace and comments:
/^((?:(?:[^?+*{}()[\]\\|]+|\\.|\[(?:\^?\\.|\^[^\\]|[^\\^])(?:[^\]\\]+|\\.)*\]|\((?:\?[:=!]|\?<[=!]|\?>)?(?1)??\)|\(\?(?:R|[+-]?\d+)\))(?:(?:[?+*]|\{\d+(?:...
Rails 4: before_filter vs. before_action
...
As we can see in ActionController::Base, before_action is just a new syntax for before_filter.
However all before_filters syntax are deprecated in Rails 5.0 and will be removed in Rails 5.1
...