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How do I exit the Vim editor?
I'm stuck and cannot escape. It says:
10 Answers
10
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How to check if a file exists in a folder?
I need to check if an xml file exists in the folder.
9 Answers
9
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How do you unit test a Celery task?
... testing Celery within Django but doesn't explain how to test a Celery task if you are not using Django. How do you do this?
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Rails: How to change the title of a page?
...
In your views do something like this:
<% content_for :title, "Title for specific page" %>
<!-- or -->
<h1><%= content_for(:title, "Title for specific page") %></h1>
The following goes in the layout file:
<head>
&...
When should I make explicit use of the `this` pointer?
...t;int> b;
b.foo();
}
If you omit this->, the compiler does not know how to treat i, since it may or may not exist in all instantiations of A. In order to tell it that i is indeed a member of A<T>, for any T, the this-> prefix is required.
Note: it is possible to still omit this...
Get name of property as a string
...re: Retrieving Property name from lambda expression you can do something like this:
RemoteMgr.ExposeProperty(() => SomeClass.SomeProperty)
public class SomeClass
{
public static string SomeProperty
{
get { return "Foo"; }
}
}
public class RemoteMgr
{
public static void ...
How can I recognize touch events using jQuery in Safari for iPad? Is it possible?
...hes[0];
alert(touch.pageX + " - " + touch.pageY);
}, false);
This works in most WebKit based browsers (incl. Android).
Here is some good documentation.
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Why does only the first line of this Windows batch file execute but all three lines execute in a com
...ny batch script, you must call another script using the call command so it knows to return back to your script after the called script completes. Try prepending call to all commands.
Another thing you could try is using the start command which should work similarly.
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What does the “+” (plus sign) CSS selector mean?
...would apply the style to every paragraph in the page.
This will only work on IE7 or above. In IE6, the style will not be applied to any elements. This also goes for the > combinator, by the way.
See also Microsoft's overview for CSS compatibility in Internet Explorer.
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is_null($x) vs $x === null in PHP [duplicate]
PHP has two (that I know of, and three if you count isset() ) methods to determine if a value is null: is_null() and === null . I have heard, but not confirmed, that === null is faster, but in a code review someone strongly suggested that I use is_null() instead as it is specifically design...