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TaifunPlayer 扩展（Audio Player）：音频播放器扩展，支持流媒体播放控制 ...
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DateTime “null” value
...
If you're using .NET 2.0 (or later) you can use the nullable type:
DateTime? dt = null;
or
Nullable<DateTime> dt = null;
then later:
dt = new DateTime();
And you can check the value with:
if (dt.HasValue)
{
// Do something wit...
How to find the .NET framework version of a Visual Studio project?
....Net 1.0
In 2003, all projects use .Net 1.1
In 2005, all projects use .Net 2.0
In 2008, projects use .Net 2.0, 3.0, or 3.5; you can change the version in Project Properties
In 2010, projects use .Net 2.0, 3.0, 3.5, or 4.0; you can change the version in Project Properties
In 2012, projects use .Net 2...
Secure random token in Node.js
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@Triforcey can you explain why you usually would want the async option?
– thomas
Jul 16 '19 at 5:17
2
...
Calculate distance between 2 GPS coordinates
... * d2r;
double dlat = (lat2 - lat1) * d2r;
double a = pow(sin(dlat/2.0), 2) + cos(lat1*d2r) * cos(lat2*d2r) * pow(sin(dlong/2.0), 2);
double c = 2 * atan2(sqrt(a), sqrt(1-a));
double d = 6367 * c;
return d;
}
double haversine_mi(double lat1, double long1, double lat2, double lo...
How do you do a ‘Pause’ with PowerShell 2.0?
... is out of scope because the original question only asked about Powershell 2.0 and excluded ISE. If you're using ISE, then just use a breakpoint.
– Ro Yo Mi
Aug 8 '17 at 13:19
4
...
Interface type check with Typescript
... object.barProperty;
}
And just as Joe Yang mentioned: since TypeScript 2.0, you can even take the advantage of tagged union type.
interface Foo {
type: 'foo';
fooProperty: string;
}
interface Bar {
type: 'bar';
barProperty: number;
}
let object: Foo | Bar;
// You will see err...
How to select rows with one or more nulls from a pandas DataFrame without listing columns explicitly
...s_sums(df, 2))
Output
num_legs num_wings num_specimen_seen
0 2.0 2.0 10.0
1 4.0 0.0 NaN
2 NaN NaN 1.0
3 0.0 0.0 8.0
4 NaN 9.0 NaN
[2, 4]
Then, if you'r...
Tab key == 4 spaces and auto-indent after curly braces in Vim
... has been replaced by cindent which "Works more cleverly", although still mainly for languages with C-like syntax:
:help C-indenting
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How do I return to an older version of our code in Subversion?
...end up with a working copy looking like the old version) and then commit again. So for example to go from revision 150 (current) back to revision 140:
svn update
svn merge -r 150:140 .
svn commit -m "Rolled back to r140"
The Subversion Red Book has a good section about this.
...