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Why are variables “i” and “j” used for counters?
...ly uses i for the first index, j for the second, and so on. Example (from http://en.wikipedia.org/wiki/Summation):
It's also used that way for collections of things, like if you have a bunch of variables x1, x2, ... xn, then an arbitrary one will be known as xi.
As for why it's that way, I ...
How can I add an empty directory to a Git repository?
How can I add an empty directory (that contains no files) to a Git repository?
35 Answers
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Why java.util.Optional is not Serializable, how to serialize the object with such fields
The Enum class is Serializable so there is no problem to serialize object with enums. The other case is where class has fields of java.util.Optional class. In this case the following exception is thrown: java.io.NotSerializableException: java.util.Optional
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ruby inheritance vs mixins
In Ruby, since you can include multiple mixins but only extend one class, it seems like mixins would be preferred over inheritance.
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Mockito: List Matchers with generics
...eUploader: {
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How can I get a resource content from a static context?
...;?xml version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.domain.packagename"
>
<application
android:allowBackup="true"
android:name=".mApplication" <!-- This is the important line -->
android:...
Adding a UILabel to a UIToolbar
I'm trying to add a label to my toolbar. Button works great, however when I add the label object, it crashes. Any ideas?
8 ...
Is it better to return null or empty collection?
That's kind of a general question (but I'm using C#), what's the best way (best practice), do you return null or empty collection for a method that has a collection as a return type ?
...
Why can Java Collections not directly store Primitives types?
... progress in this space in the JDK possibly in Java 10 based on this JEP - http://openjdk.java.net/jeps/218.
If you want to avoid boxing primitives in collections today, there are several third party alternatives. In addition to the previously mentioned third party options there is also Eclipse Co...
How do I write good/correct package __init__.py files
...- it helps guide import statements without automatically importing modules
http://docs.python.org/tutorial/modules.html#importing-from-a-package
using __all__ and import * is redundant, only __all__ is needed
I think one of the most powerful reasons to use import * in an __init__.py to import pack...