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What techniques can be used to define a class in JavaScript, and what are their trade-offs?
...ere is no such thing as classes in JavaScript. JavaScript uses a prototype-based inheritance scheme.
In addition, there are numerous popular JavaScript libraries that have their own style of approximating class-like functionality in JavaScript. You'll want to check out at least Prototype and jQue...
How can I launch Safari from an iPhone app?
...wers.
import UIKit
class InterAppCommunication {
static func openURI(_ URI: String) {
UIApplication.shared.open(URL(string: URI)!, options: [:], completionHandler: { (succ: Bool) in print("Complete! Success? \(succ)") })
}
}
...
Use dynamic variable names in JavaScript
...s quite easy answer but you make it complex.
// If you want to get article_count
// var article_count = 1000;
var type = 'article';
this[type+'_count'] = 1000; // in a function we use "this";
alert(article_count);
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Applying .gitignore to committed files
...wers were messing with files needlessly.
– kayleeFrye_onDeck
Jun 6 '17 at 22:34
1
This is the exa...
Difference between a virtual function and a pure virtual function [duplicate]
...
A virtual function makes its class a polymorphic base class. Derived classes can override virtual functions. Virtual functions called through base class pointers/references will be resolved at run-time. That is, the dynamic type of the object is used instead of its static t...
How SID is different from Service name in Oracle tnsnames.ora
...e as SID
and you can also give it any other
name you want.
SERVICE_NAME is the new feature from
oracle 8i onwards in which database
can register itself with listener. If
database is registered with listener
in this way then you can use
SERVICE_NAME parameter in tnsnames.ora
othe...
Trim trailing spaces in Xcode
...ing script:
#!/usr/bin/perl
while (<>) {
s/\s+$//;
print "$_\n";
}
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How to save a Python interactive session?
...for your use-case there is the %save magic command, you just input %save my_useful_session 10-20 23 to save input lines 10 to 20 and 23 to my_useful_session.py (to help with this, every line is prefixed by its number).
Furthermore, the documentation states:
This function uses the same syntax as...
Finding duplicate values in a SQL table
...aggregated columns in the GROUP BY.
MySQL is unpredictable and you need sql_mode=only_full_group_by:
GROUP BY lname ORDER BY showing wrong results;
Which is the least expensive aggregate function in the absence of ANY() (see comments in accepted answer).
Oracle isn't mainstream enough (warning: h...
How do I create a foreign key in SQL Server?
...
create table question_bank
(
question_id uniqueidentifier primary key,
question_exam_id uniqueidentifier not null,
question_text varchar(1024) not null,
question_point_value decimal,
constraint fk_questionbank_exams foreign ke...