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Elegant way to invert a map in Scala
...Int,String] = Map(1 -> d, 2 -> b, 3 -> c)
To avoid this you can convert your map to a list of tuples first, then invert, so that you don't drop any duplicate values:
scala> val i = m.toList.map({ case(k , v) => v -> k})
i: List[(Int, String)] = List((1,a), (2,b), (3,c), (1,d))
...
Can a Byte[] Array be written to a file in C#?
...
Try BinaryReader:
/// <summary>
/// Convert the Binary AnyFile to Byte[] format
/// </summary>
/// <param name="image"></param>
/// <returns></returns>
public static byte[] ConvertANYFileToBytes(HttpPostedFileBase image)
{
byte...
URLEncoder not able to translate space character
...ML forms.
From the javadocs:
This class contains static methods for
converting a String to the
application/x-www-form-urlencoded MIME
format.
and from the HTML Specification:
application/x-www-form-urlencoded
Forms submitted with this content type
must be encoded as follows...
Why is a boolean 1 byte and not 1 bit of size?
...nter, that is address + bit number. Obviously, such a pointer would not be convertible to void* because of the extra storage requirement for the bit number.
– Maxim Egorushkin
Jan 7 '11 at 17:10
...
Determining if an Object is of primitive type
...uto-boxing. The compiler does this itself. When it sees an opportunity, it converts a primitive type into its appropriate wrapper class.
What is probably happening here is when you declare
Object o = i;
The compiler will compile this statement as saying
Object o = Integer.valueOf(i);
This is ...
When does invoking a member function on a null instance result in undefined behavior?
... perform lvalue-to-rvalue conversion?
Regardless, it definitely cannot be converted to an rvalue (§4.1/1):
If the object to which the lvalue refers is not an object of type T and is not an object of a type derived from T, or if the object is uninitialized, a program that necessitates this conv...
How to write character & in android strings.xml
...e seems to work the best. The $amp; comes out of getString() without being converted. So it's a pain.
– Adam
Aug 28 '12 at 18:05
1
...
delete map[key] in go?
.... Deleting a non-existent entry is a no-op.
Updating: Running go fix will convert expressions of the form m[k] = value, false into delete(m, k) when it is clear that the ignored value can be safely discarded from the program and false refers to the predefined boolean constant. The fix tool will fla...
How to get the unique ID of an object which overrides hashCode()?
...he javadoc for Object specifies that
This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the JavaTM programming language.
If a class overrides hashCode, it means that it wants to generate a specif...
std::string to float or double
I'm trying to convert std::string to float/double .
I tried:
15 Answers
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