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How do CDI and EJB compare? interact?
...llows you to inject implementation into your service or whatever. The main idea is that class, where you inject, should be managed by EJB container.
Seems that CDI does understand what EJB is, so in Java EE 6 compliant server, in your servlet you can write both
@EJB EJBService ejbService;
and
@Inje...
How do I create a simple 'Hello World' module in Magento?
... experienced programmer or don't have access to an experienced programmer (ideally in PHP and Java), pick another cart. Magento is well engineered, but it was engineered to be a shopping cart solution that other programmers can build modules on top of. It was not engineered to be easily understood b...
Cookie blocked/not saved in IFRAME in Internet Explorer
...wants you to define a P3P header if you are using cookies.
This is a nice idea, and luckily most of the time not providing this header won't cause any issues (read browser warnings). Unless your website/web application is loaded into an other website using an (i)Frame. This is where IE becomes a ma...
Referring to the null object in Python
... pass
You need to understand the implications and why it's often a good idea to be explicit.
Case 1: testing if a value is None
Why do
value is None
rather than
value==None
?
The first is equivalent to:
id(value)==id(None)
Whereas the expression value==None is in fact applied like this
value._...
How do JavaScript closures work?
...er may now seem incredibly silly & out of place. Hopefully the general idea of the story remains fun for some.
I'm a big fan of analogy and metaphor when explaining difficult concepts, so let me try my hand with a story.
Once upon a time:
There was a princess...
function princess() {
She...
Flags to enable thorough and verbose g++ warnings
...ver,
turning on this warning can enforce something that is probably a good
idea. For cases where you explicitly want to ignore everything except
the listed possibilities (but other numbers are possible), then put
in default: break; to make it explicit. If you explicitly enumerate
all possibilities, ...
How does Google Instant work?
Any ideas on exactly how the new google instant search works? It seems to just be AJAX calls to the old search, but it's pretty hard to simplify Google that much. Anybody have speculations?
...
Why do we copy then move?
...or) is called, that we will be wanting a local copy of that argument. The idea is that if we know that we are going to be making a copy, we should let the caller know that we are making a copy by putting it in our argument list. They can then optimize around the fact that they are going to give us...
Why is an int in OCaml only 31 bits?
... There are people who say that this answer is imprecise. I have no idea if this is the case or if they are nitpicking. I just thought i would point to it in case it contains some truth.
– surfmuggle
Jun 28 '13 at 17:41
...
Grouping functions (tapply, by, aggregate) and the *apply family
...to each element of a nested list structure, recursively.
To give you some idea of how uncommon rapply is, I forgot about it when first posting this answer! Obviously, I'm sure many people use it, but YMMV. rapply is best illustrated with a user-defined function to apply:
# Append ! to string, othe...