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Checking if a key exists in a JavaScript object?
...mechanism in Javascript (similar to Java reflection in the Java language).
http://www.ecma-international.org/ecma-262/5.1/#sec-8.10
The Property Descriptor type is used to explain the manipulation and reification of named property attributes. Values of the Property Descriptor type are records compo...
Why should hash functions use a prime number modulus?
...out any number then make sure that table_length is a prime number.
From - http://srinvis.blogspot.com/2006/07/hash-table-lengths-and-prime-numbers.html
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How to move git repository with all branches from bitbucket to github?
...t push --mirror: to push everything
That would give:
git clone --mirror https://bitbucket.org/exampleuser/repository-to-mirror.git
# Make a bare mirrored clone of the repository
cd repository-to-mirror.git
git remote set-url --push origin https://github.com/exampleuser/mirrored
# Set the push lo...
JSON.parse vs. eval()
...mes where you need to use eval() to the JSON string. Use JSON parser from http://json.org as that handles everything a lot easier for you.
Eval() is an evil but against some browsers its a necessary evil but where you can avoid it, do so!!!!!
...
What exactly are DLL files, and how do they work?
...
http://support.microsoft.com/kb/815065
A DLL is a library that contains code
and data that can be used by more than
one program at the same time. For
example, in Windows operating systems,
the Comdlg32 DLL perform...
Convert array of strings into a string in Java
...
I like using Google's Guava Joiner for this, e.g.:
Joiner.on(", ").skipNulls().join("Harry", null, "Ron", "Hermione");
would produce the same String as:
new String("Harry, Ron, Hermione");
ETA: Java 8 has similar support now:
Strin...
Android Studio: Add jar as library?
...avenCentral() } and replace your compile files(...) line with compile 'com.google.code.gson:gson:2.2.4' and gradle will automatically download and manage the jar file for you. This allows SCM to track only source code files and not libraries.
– Joe
Jul 17 '13 a...
overlay two images in android to set an imageview
...Drawable XML file, let's call it layer.xml:
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/t" />
<item android:drawable="@drawable/tt" />
</layer-list>
Now set the image using that Drawable:
testimage.setI...
Reimport a module in python while interactive
...n 3.2 or 3.3 you should:
import imp
imp.reload(module)
instead. See http://docs.python.org/3.0/library/imp.html#imp.reload
If you are using ipython, definitely consider using the autoreload extension:
%load_ext autoreload
%autoreload 2
...
Convert UTC date time to local date time
... return a datetime in the standardized ISO 8601-format.
More info here:
http://www.w3.org/TR/NOTE-datetime
https://en.wikipedia.org/wiki/ISO_8601
IN this case the server would return '2011-06-29T16:52:48.000Z' which would feed directly into the JS Date object.
var utcDate = '2011-06-29T16:52:4...