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Is it better to return null or empty collection?
...h(var item in myInstance.CollectionProperty)
/* arrgh */
}
It is considered a best practice to NEVER return null when returning a collection or enumerable. ALWAYS return an empty enumerable/collection. It prevents the aforementioned nonsense, and prevents your car getting egged by co-workers...
In MySQL, can I copy one row to insert into the same table?
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IMRAN - you may well ask. I thought perhaps the id field of the temporary table wasn't made a PK automatically (I'm pretty sure SQL Server doesn't do so in these circumstances) but it is. I needed to do ALTER TABLE tmptable_1 MODIFY primarykey INT NULL; after the first lin...
How to force a view refresh without having it trigger automatically from an observable?
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You can't call something on the entire viewModel, but on an individual observable you can call myObservable.valueHasMutated() to notify subscribers that they should re-evaluate. This is generally not necessary in KO, as you mentioned.
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Difference between a user and a schema in Oracle?
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From Ask Tom
You should consider a schema to be the user account and collection of all objects therein
as a schema for all intents and purposes.
SCOTT is a schema that includes the EMP, DEPT and BONUS tables with various grants, and
other stuff.
SYS...
How does inline Javascript (in HTML) work?
...lert(this)">Click Me</a>
is actually closer to:
<a href="#" id="click_me">Click Me</a>
<script type="text/javascript">
document.getElementById('click_me').addEventListener("click", function(event) {
(function(event) {
alert(this);
}).call(document.getEle...
How to define two angular apps / modules in one page?
I'm trying to add two angular apps / modules to one page.
In the fiddles below you can see that always only the first module, referenced in the html code, will work correctly, whereas the second is not recognized by angular.
...
What is the cleanest way to get the progress of JQuery ajax request?
...the backend to generate some data, and return it back. How can the client side possibly know what is being done in the backend and how much time it will take that it can calculate the progress?
– SexyBeast
Apr 30 '17 at 21:11
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Is R's apply family more than syntactic sugar?
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The apply functions in R don't provide improved performance over other looping functions (e.g. for). One exception to this is lapply which can be a little faster because it does more work in C code than in R (see this question for an example of this).
But ...
Rails - controller action name to string
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action name:
<%= controller.action_name %>
return => 'show'
id:
<%= ActionController::Routing::Routes.recognize_path(request.url)[:id] %>
return => '23'
share
|
improve th...
Creating an abstract class in Objective-C
...abstract class, however. In fact, there is nothing to stop a user from providing implementations of abstract methods via a category (i.e. at runtime). You can force a user to at least override certain methods by raising an exception in those methods implementation in your abstract class:
[NSExcepti...