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background-size in shorthand background property (CSS3)
I'm trying to mix background-image and background-size properties in a shorthanded background property. Based on W3C documentation background-size should come after background-position property separated with an slash( / ).
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What is the difference between async.waterfall and async.series
The nodejs async module: https://github.com/caolan/async provides 2 similar methods, async.waterfall and async.series .
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How to use WeakReference in Java and Android development?
...e to an object, but you don't want that reference to protect the object from the garbage collector. A classic example is a cache that you want to be garbage collected when memory usage gets too high (often implemented with WeakHashMap).
Be sure to check out SoftReference and PhantomReference as we...
How to find duplicates in 2 columns not 1
I have a MySQL database table with two columns that interest me. Individually they can each have duplicates, but they should never have a duplicate of BOTH of them having the same value.
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Passing multiple error classes to ruby's rescue clause in a DRY fashion
I have some code that needs to rescue multiple types of exceptions in ruby:
3 Answers
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Check if array is empty or null
I would like to know how to check if an array is empty or null in jQuery. I tried array.length === 0 but it didn't work. It did not throw any error either.
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Import module from subfolder
I want to import subfolders as modules. Therefore every subfolder contains a __init__.py . My folder structure is like this:
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from jquery $.ajax to angular $http
...gularJS way of calling $http would look like:
$http({
url: "http://example.appspot.com/rest/app",
method: "POST",
data: {"foo":"bar"}
}).then(function successCallback(response) {
// this callback will be called asynchronously
// when the response is available
$sc...
Mongoose indexing in production code
Per the Mongoose documentation for MongooseJS and MongoDB / Node.js :
3 Answers
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How to handle multiple heterogeneous inputs with Logstash?
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Should I run as many instances as I have different types of logs?
No! You can only run one instance to handle different types of logs.
In the logstash configuration file, you can specific each input with different type.
Then in the filte...