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How to implement an abstract class in ruby?
...o
@klass = Class.new do
extend Abstract
abstract_methods :foo, :bar
end
end
it "raises NoMethodError" do
proc {
@klass.new.foo
}.should raise_error(NoMethodError)
end
it "can be overridden" do
subclass = Class.new(@klass) do
def foo
:ove...
how to set textbox value in jquery
...on:
Assuming your URL returns 5.
If your HTML looks like:
<div id="foo"></div>
then the result of
$('#foo').load('/your/url');
will be
<div id="foo">5</div>
But in your code, you have an input element. Theoretically (it is not valid HTML and does not work as you ...
Default implementation for Object.GetHashCode()
...d to compare equality of your class/struct.
Equals is used when checking
Foo A, B;
if (A == B)
Since we know the pointer isn't likely to match, we can compare the internal members.
Equals(obj o)
{
if (o == null) return false;
MyType Foo = o as MyType;
if (Foo == null) return false;
...
Why is whitespace sometimes needed around metacharacters?
...@DmitriChubarov Braces are allowed in command names (including functions: {foo} () { echo hello; }. "Name", as defined in by bash as "a word consisting only of alphanumeric characters and underscores, and beginning with an alphabetic character or an underscore", applies only to var...
Difference between “@id/” and “@+id/” in Android
...roid:id/list">
What's the difference?
.. I'm glad you asked ☺
@+id/foo means you are creating an id named foo in the namespace of your application.
You can refer to it using @id/foo.
@android:id/foo means you are referring to an id defined in the android namespace.
The '+' means to create t...
Traversing text in Insert mode
While in Insert Mode in Vim, is there any way to traverse the text moving some characters forward and backward other than using the arrow keys?
...
java: Class.isInstance vs Class.isAssignableFrom
...
clazz.isAssignableFrom(Foo.class) will be true whenever the class represented by the clazz object is a superclass or superinterface of Foo.
clazz.isInstance(obj) will be true whenever the object obj is an instance of the class clazz.
That is:
c...
Renaming table in rails
...
You would typically do this sort of thing in a migration:
class RenameFoo < ActiveRecord::Migration
def self.up
rename_table :foo, :bar
end
def self.down
rename_table :bar, :foo
end
end
share
...
Java switch statement: Constant expression required, but it IS constant
... expression to be known at compile time to compile a switch, but why isn't Foo.BA_ constant?
While they are constant from the perspective of any code that executes after the fields have been initialized, they are not a compile time constant in the sense required by the JLS; see §15.28 Constant Ex...
Eclipse ctrl+right does nothing
I'm editing a Java source in Eclipse (Version: Kepler Release). I'm used no navigate text on other editors using Ctrl + Right to move to the next word and Ctrl + Shift + Right to select the next word. But on eclipse nothing happens, the cursor stays in the same place.
...