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Why should a Java class implement comparable?
...t<Author> listAuthors(){
List<Author> authors = readAuthorsFromFileOrSomething();
Collections.sort(authors);
return authors;
}
/**
* List unique authors. Sort them by name so it will look good.
*/
public SortedSet<Author> listUniqueAuthors(){
List<Author> a...
How to cast an Object to an int
...that this object is an Integer :
int i = (Integer) object;
Or, starting from Java 7, you can equivalently write:
int i = (int) object;
Beware, it can throw a ClassCastException if your object isn't an Integer and a NullPointerException if your object is null.
This way you assume that your Obj...
Determining type of an object in ruby
...erm in the Ruby world, is to call object.class.
Since classes can inherit from other classes, if you want to determine if an object is "of a particular type" you might call object.is_a?(ClassName) to see if object is of type ClassName or derived from it.
Normally type checking is not done in Ruby,...
Detect current device with UI_USER_INTERFACE_IDIOM() in Swift
...estFlight. Strangely, it works when the app is uploaded directly to device from X-Code. I've also hit this bug.
– Zmey
May 31 '15 at 7:55
1
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What does bundle exec rake mean?
... command to execute a script in the context of the current bundle (the one from your directory's Gemfile). rake db:migrate is the script where db is the namespace and migrate is the task name defined.
So bundle exec rake db:migrate executes the rake script with the command db:migrate in the context...
Flask-SQLalchemy update a row's information
...odel. Pickled attributes should be replaced in order to trigger updates:
from flask import Flask
from flask.ext.sqlalchemy import SQLAlchemy
from pprint import pprint
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqllite:////tmp/users.db'
db = SQLAlchemy(app)
class User(db.Mode...
What does the “assert” keyword do? [duplicate]
...
should we remove code containing assert from production code ?
– Qbik
Jul 4 '16 at 15:48
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if else in a list comprehension [duplicate]
...ep certain elements (ie: you do not necessarily want an entry to the array from every iteration) then you need to put the condition at the end.
– Sam Creamer
Aug 29 '19 at 17:35
...
SyntaxError: Use of const in strict mode
...st stable NodeJS version
sudo n stable
Update nodejs instructions taken from, https://stackoverflow.com/a/19584407/698072
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Why is not in HTML 5 Tag list while is?
... quite cut it. Tags such as <center> or <font> used to be (and from what I can tell, still are) much more popular than <small>. Yet, they have been declared as deprecated.
– ЯegDwight
Feb 14 '10 at 3:36
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