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Understanding slice notation
... stop and start is the number of elements selected (if step is 1, the default).
The other feature is that start or stop may be a negative number, which means it counts from the end of the array instead of the beginning. So:
a[-1] # last item in the array
a[-2:] # last two items in the array
a...
HTML character decoding in Objective-C / Cocoa Touch
...are called Character Entity References. When they take the form of &#<number>; they are called numeric entity references. Basically, it's a string representation of the byte that should be substituted. In the case of &#038;, it represents the character with the value of 38 in the IS...
Why do we need boxing and unboxing in C#?
...nbox the double ((double)o) and then cast that to an int.
What is the result of the following:
double e = 2.718281828459045;
double d = e;
object o1 = d;
object o2 = e;
Console.WriteLine(d == e);
Console.WriteLine(o1 == o2);
Think about it for a second before going on to the next sentence.
If y...
Datetime equal or greater than today in MySQL
... FROM users WHERE created >= CURDATE();
But I think you mean created < today
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Fling gesture detection on grid layout
...Let your activity implementOnClickListener as usual:
public class SelectFilterActivity extends Activity implements OnClickListener {
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
...
Check if a given key already exists in a dictionary
... "nonexistent key" in d:
print("this will not")
If you wanted a default, you can always use dict.get():
d = dict()
for i in range(100):
key = i % 10
d[key] = d.get(key, 0) + 1
and if you wanted to always ensure a default value for any key you can either use dict.setdefault() repeat...
How to invoke a Linux shell command from Java
... IOException, InterruptedException {
//Build command
List<String> commands = new ArrayList<String>();
commands.add("/bin/cat");
//Add arguments
commands.add("/home/narek/pk.txt");
System.out.println(commands);
//Run macro on targe...
How do I check two or more conditions in one ?
How do I check two conditions in one <c:if> ? I tried this, but it raises an error:
4 Answers
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What's the best way to share data between activities?
...data or Strings. You can also pass objects that implements Serializable.
Although tempting, you should think twice before using Serializable: it's error prone and horribly slow. So in general: stay away from Serializable if possible. If you want to pass complex user-defined objects, take a look at ...
How to determine if binary tree is balanced?
...d(tree.right) and
abs(Height(tree.left) - Height(tree.right)) <= 1)
Translating that into the programming language of your choice should be trivial.
Bonus exercise: this naive code sketch traverses the tree far too many times when computing the heights. Can you make it more efficie...