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How do you sort an array on multiple columns?
...[A, 5], [A, 10], [J, 5], [J, 15]]. It sorts by the first attribute first, and if those are the same, then it sorts by the second attribute. So in your example, A would come before J. In the case where A is the same for two elements, then it would use the second attribute. So For [A,10], [A,5], 5 ...
Why do you have to call .items() when iterating over a dictionary in Python?
...f least astonishment, in would also have to take such a tuple as its left-hand operand in the containment check.
How useful would that be? Pretty useless indeed, basically making if (key, value) in C a synonym for if C.get(key) == value -- which is a check I believe I may have performed, or wanted...
Android on-screen keyboard auto popping up
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This worked for me. I'm running Android 2.3.4, and developing using <uses-sdk android:minSdkVersion="3" />
– Sandy
Oct 8 '11 at 20:32
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How can I create a simple message box in Python?
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You could use an import and single line code like this:
import ctypes # An included library with Python install.
ctypes.windll.user32.MessageBoxW(0, "Your text", "Your title", 1)
Or define a function (Mbox) like so:
import ctypes # An inclu...
Java Generics: Cannot cast List to List? [duplicate]
...ne at compile time.
In the first case, imagine that the code did compile, and was followed by:
b1.add(new SomeOtherTree());
DataNode node = a1.get(0);
What would you expect to happen?
You can do this:
List<DataNode> a1 = new ArrayList<DataNode>();
List<? extends Tree> b1 = a1...
What's the difference between String(value) vs value.toString()
Javascript has lot's of "tricks" around types and type conversions so I'm wondering if these 2 methods are the same or if there is some corner case that makes them different?
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How to lose margin/padding in UITextView?
...abled in the Inspector!
(Turning on scrollEnabled means "make this view expand as much as possible vertically," so it will add a huge margin at the bottom.)
Some further issues
(1) In some very unusual cases dynamically changing heights, Apple does a bizarre thing: they add extra space at the botto...
Sharing Test code in Maven
...so: classifier). It tells Maven a bit more explicitly what you are doing (and I've found that m2eclipse and q4e both like it better).
<dependency>
<groupId>com.myco.app</groupId>
<artifactId>foo</artifactId>
<version>1.0-SNAPSHOT</version>
<type...
How to add an auto-incrementing primary key to an existing table, in PostgreSQL?
...e with existing data. Is there a way to add a primary key without deleting and re-creating the table?
4 Answers
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Convert integer to binary in C#
...ger expressed as a string. Let's say your integer was actually an integer, and you want to take the integer and convert it to a binary string.
int value = 8;
string binary = Convert.ToString(value, 2);
Which returns 1000.
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