大约有 34,900 项符合查询结果（耗时：0.0417秒） [XML]
How to express a NOT IN query with ActiveRecord/Rails?
...s since it seems a lot of people come to this, if you are using Rails 4 look at the answers by Trung Lê` and VinniVidiVicci.
...
Deleting lines from one file which are in another file
...
grep -v -x -f f2 f1 should do the trick.
Explanation:
-v to select non-matching lines
-x to match whole lines only
-f f2 to get patterns from f2
One can instead use grep -F or fgrep to match fixed strings from f2 rather than patterns (in case you want remove...
Find out a Git branch creator
...
A branch is nothing but a commit pointer. As such, it doesn't track metadata like "who created me." See for yourself. Try cat .git/refs/heads/<branch> in your repository.
That written, if you're really into tracking this information in your repository, check out branch descriptions. ...
Properties vs Methods
Quick question: When do you decide to use properties (in C#) and when do you decide to use methods?
16 Answers
...
Proper way to use **kwargs in Python
What is the proper way to use **kwargs in Python when it comes to default values?
14 Answers
...
How to replace an item in an array with Javascript?
...exOf(3452);
if (~index) {
items[index] = 1010;
}
Sometimes I even like to write a contains function to abstract this check and make it easier to understand what's going on. What's awesome is this works on arrays and strings both:
var contains = function (haystack, needle) {
return !!~hay...
How do I make a placeholder for a 'select' box?
I'm using placeholders for text inputs which is working out just fine. But I'd like to use a placeholder for my selectboxes as well. Of course I can just use this code:
...
Given a number, find the next higher number which has the exact same set of digits as the original n
...made pretty much zero progress on my interview question. Can anyone let me know how to do this? I tried searching online but couldn't find anything:
...
C# operator overload for `+=`?
I am trying to do operator overloads for += , but I can't. I can only make an operator overload for + .
10 Answers
...
Is there a printf converter to print in binary format?
...
Hacky but works for me:
#define BYTE_TO_BINARY_PATTERN "%c%c%c%c%c%c%c%c"
#define BYTE_TO_BINARY(byte) \
(byte & 0x80 ? '1' : '0'), \
(byte & 0x40 ? '1' : '0'), \
(byte & 0x20 ? '1' : '0'), \
(byte & 0x...