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What is a WeakHashMap and when to use it? [duplicate]
...is good to implement canonical maps. Lets say you want to associate
some extra information to an object that you have a strong reference
to. You put an entry in a WeakHashMap with the object as the key, and
the extra information as the map value. Then, as long as you keep a
strong reference ...
How to check that a string is a palindrome using regular expressions?
... all palindromes. The proof relies on the facts that we can easily build a string that requires an arbitrarily large number of nodes, namely the string
a^x b a^x (eg., aba, aabaa, aaabaaa, aaaabaaaa, ....)
where a^x is a repeated x times. This requires at least x nodes because, after seeing the 'b...
Detect if a NumPy array contains at least one non-numeric value?
...nce - the function should give the correct value regardless of ndim. As an extra complication the input could be a single float or numpy.float64 or even something oddball like a zero-dimensional array.
...
How to convert an address into a Google Maps Link (NOT MAP)
...ss>, so formatting is preserved
It properly encodes the URL
It squashes extra spaces so that the generated URL is shorter and cleaner and human-readable after encoding
It produces valid markup (Mr.Hendershot's solution creates <a><address></address></a> which is invalid be...
Expand a random range from 1–5 to 1–7
...
Very nice! Can we retain the extra entropy without growing state? The trick is to notice that both upper- and lower- bounds are at all times rational numbers. We can add, subtract, and multiply these without losing precision. If we do it all in base-35, ...
Installing rmagick on Ubuntu
....2 sudo apt-get install libmagickwand-dev libmagickcore-dev libmagickcore4-extra libgraphviz-dev libgvc5 worked for me.
graphicsmagick-libmagick-dev-compat installed but didn't include the header files so rmagick wouldn't compile.
Please note, you need to remove graphicsmagick-libmagick-dev-compat...
How to create a WPF UserControl with NAMED content
...ty HeadingProperty =
DependencyProperty.Register("Heading", typeof(string),
typeof(HeadingContainer), new PropertyMetadata(HeadingChanged));
private static void HeadingChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
((HeadingContainer) d).Heading ...
How many String objects will be created when using a plus sign?
How many String objects will be created when using a plus sign in the below code?
6 Answers
...
Is Java's assertEquals method reliable?
I know that == has some issues when comparing two Strings . It seems that String.equals() is a better approach. Well, I'm doing JUnit testing and my inclination is to use assertEquals(str1, str2) . Is this a reliable way to assert two Strings contain the same content? I would use assertTr...
How to loop through all enum values in C#? [duplicate]
...
static void Main(string[] args)
{
foreach (int value in Enum.GetValues(typeof(DaysOfWeek)))
{
Console.WriteLine(((DaysOfWeek)value).ToString());
}
foreach (string value in Enum.GetNames(typeof(DaysOfWeek)))
{
...