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When should I use the Visitor Design Pattern? [closed]
... build and maintain the children list.]
class TreeNode( object ):
def __init__( self, name, *children ):
self.name= name
self.children= children
def visit( self, someVisitor ):
someVisitor.arrivedAt( self )
someVisitor.down()
for c in self.children:
...
jQuery Validate Plugin - Trigger validation of single field
...e end so it looked for me $("#Form").data('validator').element('input[name=__Suburb]').valid(); I believe that if you do not select it by ID this might be required.
– Mihai P.
Jan 15 '15 at 0:10
...
Using Enum values as String literals
...of enums:
public final class Modes {
public static final String MODE_1 = "Fancy Mode 1";
public static final String MODE_2 = "Fancy Mode 2";
public static final String MODE_3 = "Fancy Mode 3";
private Modes() { }
}
Option Four: interfaces have every field public, static and fin...
Adding external library into Qt Creator project
...your lib files in the project directory, you can reference them with the $$_PRO_FILE_PWD_ variable, e.g.:
LIBS += -L"$$_PRO_FILE_PWD_/3rdparty/libs/" -lpsapi
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What is the { get; set; } syntax in C#?
... a property with a backing field.
public class Genre
{
private string _name;
public string Name
{
get => _name;
set => _name = value;
}
}
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Correct Bash and shell script variable capitalization
...nt variables (PAGER, EDITOR, ...) and internal shell variables (SHELL, BASH_VERSION, ...) are capitalized. All other variable names should be lower case.
Remember that variable names are case-sensitive; this convention avoids accidentally overriding environmental and internal variables.
Keeping to...
Convert SQLITE SQL dump file to POSTGRESQL
...base. I installed from the *.deb and created a command file like this in a test directory:
load database
from 'db.sqlite3'
into postgresql:///testdb
with include drop, create tables, create indexes, reset sequences
set work_mem to '16MB', maintenance_work_mem to '512...
See changes to a specific file using git
...
Use a command like:
git diff file_2.rb
See the git diff documentation for full information on the kinds of things you can get differences for.
Normally, git diff by itself shows all the changes in the whole repository (not just the current directory).
...
java.net.URLEncoder.encode(String) is deprecated, what should I use instead?
...encode(
"urlParameterString",
java.nio.charset.StandardCharsets.UTF_8.toString()
)
);
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install / uninstall APKs programmatically (PackageManager vs Intents)
... how about ACTION_INSTALL_PACKAGE ? can we download and install latest version our app from play store ?
– MAS. John
Mar 3 '18 at 1:44
3
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