I'm re-defining a method in an object in ruby and I need the new method to be a closure. For example:
def mess_it_up(o)
x = "blah blah"
def o.to_s
puts x # Wrong! x doesn't exists here, a method is not a closure
end
end
Now if I define a Proc, it is a closure:
def mess_it_up(o)
x = "blah blah"
xp = Proc.new {||
p...
Closures are poor man's objects and vice versa.
I have seen this statement at many places on the web (including SO) but I don't quite understand what it means. Could someone please explain what it exactly means?
If possible, please include examples in your answer.
Thanks.
...
How can i call test() inside that method? It's possible?
(function() {
tinymce.create('tinymce.plugins.WrImagerPlugin', {
init : function(editor, url) {
editor.addCommand('mceWrImagerLink', function() {
//--> how can i refer to test() here?
});
},
test: function () ...
why does this work:
def function1():
a = 10
def function2():
print a
function2()
...
I was asked to explain the ugly thing and advantages of anonymous method.
I explained possibly
Ugly thing
anonymous methods turning quickly into spaghetti code.
Advantages
We can produce thread safe code using anonymous method :Example
static List<string> Names = new List<string>(
new string[] {
"Jon Skeet",
"Marc Grav...
I am learning C#.Can I mean closure as a construct that can adopt the changes in the environment in which it is defined.
Example :
List<Person> gurus =
new List<Person>()
{
new Person{id=1,Name="Jon Skeet"},
new Person{id=2,Name="Marc Gravell"},
new Person{id=3,N...
So is Java 7 finally going to get the closures? What's the latest news?
...
Hey there,
I've got a prototype having a method I can add callbacks with:
/*
* Add a callback function that is invoked on every element submitted and must return a data object.
* May be used as well for transmitting static data.
*
* The callback function is supposed to expect a jQuery element as single parameter
* and must retur...
Is it possible to bind a closure written in java into a groovy-script. Is there an interface or something to implement so i can provide a closure?
Something like this?
public class Example implements Closure {
public void closure(Object... args) {
System.out.println(args[0]);
}
}
Bind this into the groovyscript.
Binding...
Here is a simplified version of something I'm trying to run:
for (var i = 0; i < results.length; i++) {
marker = results[i];
google.maps.event.addListener(marker, 'click', function() {
change_selection(i);
});
}
but I'm finding that every listener uses the value of results.length (the value when the for loop terminates)....
I have the latest ReSharper 5.0 build (1655), where I have encountered the suggestion 'Access to modified closure' on the following code:
var now = new DateTime(1970, 1, 1);
var dates = new List<DateTime>();
dates.Where(d => d > now);
...
now = new DateTime();
and the now inside the lambda expression is underlined with the warning.
I...
The script fires Toggle fine on each Control's (Controls[i]) Click. If the Control's first OL element is not Visible it should be set Visible and all other elements in Controls that are not the current Control (Controls[i]) should be set Hidden. If the Control's first OL element is Visible it should be set Hidden.
.js
function Toggle(C...
I've been trying to work out how to implement Church-encoded data types in Scala. It seems that it requires rank-n types since you would need a first-class const function of type forAll a. a -> (forAll b. b -> b).
However, I was able to encode pairs thusly:
import scalaz._
trait Compose[F[_],G[_]] { type Apply = F[G[A]] }
trait Closu...
I was listening to Crockford's talk on Javascript closures and am convinced of the benefit of information hiding, but I do not have a firm understanding of when to use callback functions.
It is mostly a true statement that a person could accomplish the same functionality with or without callbacks.
As someone who is writing code, what h...
I am not a Groovy expert, but I did read the book "Groovy in Action". In Groovy, each closure comes with a "context", where the items inside the closure can get access to pseudo-variables like "this", "owner", and "delegate", that let the items know who called the closure. This allows one to write DSLs like this (from Groovy in Action):
...
OK, this is going to be my beating a dying horse for the 3rd time.
However, this question is different from my earlier two about closures/delegates, which asks about plans for delegates and what are the projected specs and implementation for closures.
This question is about - why is the Java community struggling to define 3 different t...
In trying to learn JavaScript closures, I've confused myself a bit.
From what I've gathered over the web, a closure is...
Declaring a function within another function, and that inner function has access to its parent function's variables, even after that parent function has returned.
Here is a small sample of script from a recent proj...
Disclaimer: absolute novice in Scala :(
I have the following defined:
def tryAndReport(body: Unit) : Unit = {
try {
body
} catch {
case e: MySpecificException => doSomethingUseful
}
}
I call it like this:
tryAndReport{
someCodeThatThrowsMySpecificException()
}
While the call to someCodeThatThrowsMySpecificException...
While I was reading the book Javascript: The Good Parts. I can not understand the piece of code bellow:
We can generalize this by making a
function that helps us make memoized
functions. The memoizer function will
take an initial memo array and the
fundamental function. It returns a
shell function that manages the memo
st...
For example:
var myObj={
myValue="hola",
asMember=function(){ alert( this.myValue ); }
};
myObj.asMember(); // will work fine
var asGlobal=myObj.asMember; // global alias for that member function
asGlobal(); // won't work in javascript (will work in AS3, but i need js now)
So the question is, can I rewrite asMember so that i...