大约有 43,000 项符合查询结果（耗时：0.0390秒） [XML]
Save ArrayList to SharedPreferences
... list to preference
SharedPreferences prefs = getSharedPreferences(SHARED_PREFS_FILE, Context.MODE_PRIVATE);
Editor editor = prefs.edit();
try {
editor.putString(TASKS, ObjectSerializer.serialize(currentTasks));
} catch (IOException e) {
e.printStackTrace();
}
editor.commit();
}
...
How to map and remove nil values in Ruby
...
Ruby 2.7+
There is now!
Ruby 2.7 is introducing filter_map for this exact purpose. It's idiomatic and performant, and I'd expect it to become the norm very soon.
For example:
numbers = [1, 2, 5, 8, 10, 13]
enum.filter_map { |i| i * 2 if i.even? }
# => [4, 16, 20]
In your ...
A Regex that will never be matched by anything
...e of $a. It's Perl equivalent $(?:a) is also very slow perl -Mre=debug -e'$_=a x 50; /$(?:a)/'.
– Brad Gilbert
Apr 6 '13 at 14:56
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Applying a function to every row of a table using dplyr?
...f Hadley's examples using pmap:
iris %>%
mutate(Max.Len= purrr::pmap_dbl(list(Sepal.Length, Petal.Length), max))
Using this approach, you can give an arbitrary number of arguments to the function (.f) inside pmap.
pmap is a good conceptual approach because it reflects the fact that when ...
SQL Server database backup restore on lower version
.... Download the latest version from here. Prerequisites: sqlncli.msi/sqlncli_x64.msi/sqlncli_ia64.msi, SQLServer2005_XMO.msi/SQLServer2005_XMO_x64.msi/SQLServer2005_XMO_ia64.msi (download here).
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C# properties: how to use custom set property without private field?
...s for the property's get and set accessors.
See more here
private string _name;
public string Name
{
get => _name;
set
{
DoSomething();
_name = value;
}
}
share
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How add context menu item to Windows Explorer for folders [closed]
... of Windows Explorer or on background of a directory in right panel:
HKEY_CLASSES_ROOT\Directory\Background\shell if you are administrator
HKEY_CURRENT_USER\Software\Classes\directory\Background\shell if you are a normal user
Context menu for right click on folders in right panel of Windows Expl...
Renaming columns in pandas
...e the name of the first variable of df. Then you can do something like: new_columns = df.columns.values; new_columns[0] = 'XX'; df.columns = new_columns
– cd98
Nov 20 '13 at 14:18
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Calculating Distance between two Latitude and Longitude GeoCoordinates
...tic UnitOfLength Miles = new UnitOfLength(1);
private readonly double _fromMilesFactor;
private UnitOfLength(double fromMilesFactor)
{
_fromMilesFactor = fromMilesFactor;
}
public double ConvertFromMiles(double input)
{
return input*_fromMilesFactor;
}
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Java: PrintStream to String?
...= new ByteArrayOutputStream();
final String utf8 = StandardCharsets.UTF_8.name();
try (PrintStream ps = new PrintStream(baos, true, utf8)) {
yourFunction(object, ps);
}
String data = baos.toString(utf8);
...