大约有 21,000 项符合查询结果（耗时：0.0496秒） [XML]
Why are these numbers not equal?
....15")
yields
i equals 0.15
Some more examples of using all.equal instead of == (the last example is supposed to show that this will correctly show differences).
0.1+0.05==0.15
#[1] FALSE
isTRUE(all.equal(0.1+0.05, 0.15))
#[1] TRUE
1-0.1-0.1-0.1==0.7
#[1] FALSE
isTRUE(all.equal(1-0.1-0.1-0.1, 0...
How to change the author and committer name and e-mail of multiple commits in Git?
...ilter-repo. If you still need to use git filter-branch, please carefully read SAFETY (and PERFORMANCE) to learn about the land mines of filter-branch, and then vigilantly avoid as many of the hazards listed there as reasonably possible.
Changing the author (or committer) would require re-writing al...
How to unset a JavaScript variable?
...(actually a window property, but I don't think it matters) which was already populated by a previous script but I don't want another script that will run later to see its value or that it was even defined.
...
Random string generation with upper case letters and digits
...enerates the elements on the fly, one by one (more about this here).
Instead of asking to create 'n' times the string elem, we will ask Python to create 'n' times a random character, picked from a sequence of characters:
>>> random.choice("abcde")
'a'
>>> random.choice("abcde")
'...
Suppress warning CS1998: This async method lacks 'await'
...ything to await, and some might just throw.
In these cases, you can take advantage of the fact that async is an implementation detail.
If you have nothing to await, then you can just return Task.FromResult:
public Task<int> Success() // note: no "async"
{
... // non-awaiting code
int r...
How do I convert an existing callback API to promises?
...returning functions should never throw, they should return rejections instead. Throwing from a promise returning function will force you to use both a } catch { and a .catch. People using promisified APIs do not expect promises to throw. If you're not sure how async APIs work in JS - please see this...
Routing with Multiple Parameters using ASP.NET MVC
...
Parameters are directly supported in MVC by simply adding parameters onto your action methods. Given an action like the following:
public ActionResult GetImages(string artistName, string apiKey)
MVC will auto-populate the parameters when given a URL like:
/Artist/GetImag...
How to programmatically create and read WEP/EAP WiFi configurations in Android?
How to programmatically create and read WEP/EAP WiFi configurations in Android?
5 Answers
...
What does “static” mean in C?
...r, this feature should be used very sparingly - it makes your code not thread-safe and harder to understand.
(2) Is used widely as an "access control" feature. If you have a .c file implementing some functionality, it usually exposes only a few "public" functions to users. The rest of its functions...
Force “git push” to overwrite remote files
...ter the point of change they will become invalid.
Update: Thought I would add a side-note. If you are creating changes that others will review, then it's not uncommon to create a branch with those changes and rebase periodically to keep them up-to-date with the main development branch. Just let oth...