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What is the difference between Class Path and Build Path
...application. A Classpath is mandatory, the default path is . which is used if the java virtual machine can't find a user defined path. (CLASSPATH environment variable, -cp flag or Class-Path: attribute in a jar manifest)
sha...
Should I embed images as data/base64 in CSS or HTML
...page or style sheet get loaded.
Base64 encoding bloats image sizes by 33%.
If served in a gzipped resource, data: images are almost certainly going to be a terrible strain on the server's resources! Images are traditionally very CPU intensive to compress, with very little reduction in size.
...
Pandas - Get first row value of a given column
...could use:
In [30]: df_test['Btime'].iloc[0]
Out[30]: 1.2
There is a difference between df_test['Btime'].iloc[0] (recommended) and df_test.iloc[0]['Btime']:
DataFrames store data in column-based blocks (where each block has a single
dtype). If you select by column first, a view can be returned...
How can I hash a password in Java?
...hentication
{
/**
* Each token produced by this class uses this identifier as a prefix.
*/
public static final String ID = "$31$";
/**
* The minimum recommended cost, used by default
*/
public static final int DEFAULT_COST = 16;
private static final String ALGORITHM = "PBKDF...
How to exclude property from Json Serialization
...
If you are using System.Web.Script.Serialization in the .NET framework you can put a ScriptIgnore attribute on the members that shouldn't be serialized. See the example taken from here:
Consider the following (simplified) ca...
Python serialization - Why pickle?
...o 'store' a Python Object in a way that does respect Object programming - different from an output written in txt file or DB.
...
What does Provider in JAX-RS mean?
... annotation does? I have been reading documentation but I cant get it.
If there are resource classes that service the incoming requests, what do Providers do? How are they different from singleton resource classes when I create a persistent resource class (the one that is not per-request)? Or are ...
How can I sort generic list DESC and ASC?
...ting an ordered enumerable of the list but the list itself hasn't changed. If you want to mutate the list, you would change the Linq methods to something like
li = li.OrderBy(i => i).ToList();
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SQL Server IN vs. EXISTS Performance
...quires SQL Server to generate a complete result set, and then create a big IF statement I think.
– Randy Minder
Jan 14 '10 at 16:04
74
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How to delete all Annotations on a MKMapView
...userLocation];
[mapView removeAnnotations:[mapView annotations]];
if ( userLocation != nil ) {
[mapView addAnnotation:userLocation]; // will cause user location pin to blink
}
}
Example 2, I personally prefer to avoid removing the location user pin
in the first place,
-...