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How to have conditional elements and keep DRY with Facebook React's JSX?
How do I optionally include an element in JSX? Here is an example using a banner that should be in the component if it has been passed in. What I want to avoid is having to duplicate HTML tags in the if statement.
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What is a typedef enum in Objective-C?
...declared, ShapeType is being declared a typedef for that anonymous enumeration, and the three names kCircle, kRectangle, and kOblateSpheroid are being declared as integral constants.
Let's break that down. In the simplest case, an enumeration can be declared as
enum tagname { ... };
This declar...
Can you attach Amazon EBS to multiple instances?
...up and attach the EBS to multiple machine instances or what's another solution?
11 Answers
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BCL (Base Class Library) vs FCL (Framework Class Library)
...LR). Plus then there's the whole ecosytem that surrounds that: Visual Studio, MSDN Help, and more.
– Andrew Webb
May 1 '09 at 9:44
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MVC Vs n-tier architecture
...ich is an architectural pattern) and an n-tier architecture for an application. I searched for it but couldn't find a simple explanation. May be I am a bit naive on MVC concepts, so if anyone can explain the difference then it would be great.
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Elegant way to check for missing packages and install them?
... @psql , Shine is right, since ">0" is "implicit" within the if condition. run this for to verify it: new.packages <- c(1,2) length(new.packages) if(length(new.packages)){print("hello!")}else{print("oh no!")}
– Andrea Cirillo
Jan 22 '16 at 7:57
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How to reset Jenkins security settings from the command line?
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The simplest solution is to completely disable security - change true to false in /var/lib/jenkins/config.xml file.
<useSecurity>true</useSecurity>
Then just restart Jenkins, by
sudo service jenkins restart
And then go to adm...
How to call a Python function from Node.js
I have an Express Node.js application, but I also have a machine learning algorithm to use in Python. Is there a way I can call Python functions from my Node.js application to make use of the power of machine learning libraries?
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How to detect current state within directive
...is();
You can use it like so:
$state.is('stateName');
Per the documentation:
$state.is ... similar to $state.includes, but only checks for the full state name.
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How do you connect to multiple MySQL databases on a single webpage?
I have information spread out across a few databases and want to put all the information onto one webpage using PHP. I was wondering how I can connect to multiple databases on a single PHP webpage.
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