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How would you implement an LRU cache in Java?
...gt; eldest) {
return super.size() > maxEntries;
}
}
Map<String, String> example = Collections.synchronizedMap(new LruCache<String, String>(CACHE_SIZE));
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What is the difference between null and undefined in JavaScript?
...alert() this value, you won't see anything. However, if you append a blank string to it then suddenly it'll appear:
var s;
WScript.Echo(s);
WScript.Echo("" + s);
You can declare a variable, set it to null, and the behavior is identical except that you'll see "null" printed out versus "undefined"....
overlay two images in android to set an imageview
...= DEFAULT_IMAGE_SIZE * 2, MAX_HEIGHT = DEFAULT_IMAGE_SIZE * 2;
private String picassoRequestTag = null;
public MergeImageView(Context context) {
super(context);
}
public MergeImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public M...
Is there a PHP function that can escape regex patterns before they are applied?
...
preg_quote() is what you are looking for:
Description
string preg_quote ( string $str [, string $delimiter = NULL ] )
preg_quote() takes str and puts a
backslash in front of every character
that is part of the regular expression
syntax. This is useful if you have a
...
How to overwrite the previous print to stdout in python?
...):
print('{}\r'.format(x), end="")
print()
In Python 3.6 and later, f-strings read better:
for x in range(10):
print(f'{x}\r', end="")
print()
Of course, as Tim Seguine points out in the comments, for a case this simple, you don't even need to do formatting:
for x in range(10):
print(x...
How do I deep copy a DateTime object?
...now. I'd like to create two separate datetimes, one which is parsed from a string and one with three years added to it. Currently I've hacked it up like this:
...
Escaping keyword-like column names in Postgres
...ml#delimited%20identifier
This is the code to quote the identifier:
static String delimited_identifier (String identifier)
{
return "\"" + identifier.replaceAll ("\"", "\"\"") + "\"";
}
And this is the code to build the insert:
static String build_insert (String table, String[] columns)
{
Strin...
'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine
...ying to get data from an Excel file on a button click event. My connection string is:
34 Answers
...
How to use Namespaces in Swift?
...ivate classes in Apple's framework, anything declared public, for instance String, if you declare that again, or any new class, it will end up using yours, unless of course you are in the habit of referring to all classes with its namespace.... not good imo.
– Oscar Gomez
...
Remove element of a regular array
...econd element in C# zero-based array indexing).
A more complete example:
string[] myArray = { "a", "b", "c", "d", "e" };
int indexToRemove = 1;
myArray = myArray.Where((source, index) => index != indexToRemove).ToArray();
After running that snippet, the value of myArray will be { "a", "c", "d...