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Why use symbols as hash keys in Ruby?
...Symbols are garbage collected in Ruby 2.2
– Marc-André Lafortune
Jan 20 '15 at 18:28
2
Great ans...
java.util.regex - importance of Pattern.compile()?
...ch is really called a lot :)
public class AmountValidator {
//Accept 123 - 123,456 - 123,345.34
private static final String AMOUNT_REGEX="\\d{1,3}(,\\d{3})*(\\.\\d{1,4})?|\\.\\d{1,4}";
//Compile and save the pattern
private static final Pattern AMOUNT_PATTERN = Pattern.compile(AM...
Why catch and rethrow an exception in C#?
...ple, in VB you can do
Try
..
Catch Ex As MyException When Ex.ErrorCode = 123
..
End Try
...which would not handle MyExceptions with different ErrorCode values. In C# prior to v6, you would have to catch and re-throw the MyException if the ErrorCode was not 123:
try
{
...
}
catch(MyExcepti...
Multiple Updates in MySQL
...afe code for the variant with case statement ?
– François M.
Jul 21 '15 at 16:44
1
I find the in...
How to get the first column of a pandas DataFrame as a Series?
...he column's header has e.g. spaces in it.
– Jean-François Corbett
Jan 24 '18 at 12:54
add a comment
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What is boxing and unboxing and what are the trade offs?
...xing is the conversion of a reference type into a value type.
EX: int i = 123;
object o = i;// Boxing
int j = (int)o;// UnBoxing
Value Types are: int, char and structures, enumerations.
Reference Types are:
Classes,interfaces,arrays,strings and objects
...
download file using an ajax request
...'t this dangerous security-wise?
– Mickael Bergeron Néron
Jun 22 '16 at 17:32
@MickaelBergeronNéron Why?
...
Force drop mysql bypassing foreign key constraint
...ed Feb 19 '10 at 23:53
Otávio DécioOtávio Décio
68.9k1414 gold badges152152 silver badges219219 bronze badges
...
Regular expression to match numbers with or without commas and decimals in text
... are embedded in other text. IMHO anything that fails to pull 1,234.56 and 1234—and only those numbers—out of abc22 1,234.56 9.9.9.9 def 1234 is a wrong answer.
First of all, if you don't need to do this all in one regex, don't. A single regex for two different number formats is hard to maintain...
Throw keyword in function's signature
...s you will never catch even if you try.
– Anders Lindén
Mar 28 '16 at 11:03
1
@AndersLindén wha...