大约有 48,000 项符合查询结果（耗时：0.0487秒） [XML]
For each row return the column name of the largest value
...s.method = "first")) %>% # or 'last'
filter(dept_rank == 1) %>%
select(-dept_rank)
# A tibble: 3 x 3
# Groups: id [3]
id dept cnt
<chr> <chr> <dbl>
1 2 V1 8.
2 3 V2 5.
3 1 V3 9.
# if you wanted to keep the original wide data f...
In Mongoose, how do I sort by date? (node.js)
... error sort() only takes 1 Argument :
Post.find({}, {
'_id': 0, // select keys to return here
}, {sort: '-date'}, function(err, posts) {
// use it here
});
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How can I pass a parameter to a setTimeout() callback?
...
I'm not sure why this answer wasn't selected as the best. Using an anonymous function works, sure, but if you can simply pass a third parameter into the original setTimeout function call... why not?
– Kris Schouw
Sep 21 '1...
git add . vs git commit -a
...ically invokes git add on all files it knows about. You can use git add to select what files to commit. Consult the docs for more info: here
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Test for existence of nested JavaScript object key
...th Claudiu's modification which is also significantly more performant than selected answer. See jsperf here jsperf.com/check-if-deep-property-exists-with-willnotthrow
– netpoetica
Nov 27 '14 at 5:35
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Which sort algorithm works best on mostly sorted data? [closed]
...oking for, I read books but I don't seem to find any clear explanation for selection of alogorithms at particular cases, could you please elaborate this or pass a link so that i can dog into it a little more? Thanks
– Simran kaur
Jun 24 '14 at 3:53
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Detecting when the 'back' button is pressed on a navbar
...navigationItem.leftBarButtonItem = backButton
}
// Then handle the button selection
func goBack() {
// Here we just remove the back button, you could also disabled it or better yet show an activityIndicator
self.navigationItem.leftBarButtonItem = nil
someData.saveInBackground { (success...
Purpose of Unions in C and C++
... @legends2k: any decent optimizer will recognize bitwise operations that select an entire byte and generate code to read/write the byte, same as the union but well-defined (and portable). e.g. uint8_t getRed() const { return colour & 0x000000FF; } void setRed(uint8_t r) { colour = (colour &...
Where does Oracle SQL Developer store connections?
...n." in it (for me, it was in o.jdeveloper.db.connection.11.1.1.4.37.59.48)
select connections.xml and click open
You should then see the list of connections that will be imported
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Get list of passed arguments in Windows batch script (.bat)
...racters such as &? When I try to retrieve several the path of several selected files (using Send To menu and "%*" which pass the args to a .py) it stops the listing at the & caracters. So if for instance the second file contain a & in its name, the the part of the name after the & w...