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How to test if list element exists?
...tain NULL elements, it might not be enough to check is.null(foo$a). A more stringent test might be to check that the name is actually defined in the list:
foo <- list(a=42, b=NULL)
foo
is.null(foo[["a"]]) # FALSE
is.null(foo[["b"]]) # TRUE, but the element "exists"...
is.null(foo[["c"]]) # TRUE...
How do I address unchecked cast warnings?
...affect the entire method.
Example:
@SuppressWarnings("unchecked")
Map<String, String> myMap = (Map<String, String>) deserializeMap();
There is no way to determine whether the Map really should have the generic parameters <String, String>. You must know beforehand what the param...
How to view the assembly behind the code using Visual C++?
...isassembler on the .exe.
e.g. http://rextester.com/OKI40941
#include <string>
#include <boost/filesystem.hpp>
#include <Windows.h>
using namespace std;
static string my_exe(void){
char buf[MAX_PATH];
DWORD tmp = GetModuleFileNameA( NULL, // self
...
Use cases for NoSQL [closed]
...mically add/remove filters using php data structures and avoiding tedious
string concatenation to build up our queries. With this approach adding/removing filters dinamycally is as easy as adding / removing
elements from an array
Another great benefit comes from the fact that a solution like this ...
Utils to read resource text file to String (Java) [closed]
Is there any utility that helps to read a text file in the resource into a String. I suppose this is a popular requirement, but I couldn't find any utility after Googling.
...
Why are empty strings returned in split() results?
... so
"/".join(['', 'segment', 'segment', ''])
gets you back the original string.
If the empty strings were not there, the first and last '/' would be missing after the join()
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Sending Arguments To Background Worker?
...
@rayray: label1.Text = e.Result.ToString(); , everywhere I marked that as safe.
– Henk Holterman
May 16 '19 at 4:57
add a comment
...
Regex to validate password strength
...:
^ Start anchor
(?=.*[A-Z].*[A-Z]) Ensure string has two uppercase letters.
(?=.*[!@#$&*]) Ensure string has one special case letter.
(?=.*[0-9].*[0-9]) Ensure string has two digits.
(?=.*[a-z].*[a-z].*[a-z]) Ensure string has three lowercase le...
Remove non-utf8 characters from string
Im having a problem with removing non-utf8 characters from string, which are not displaying properly. Characters are like this 0x97 0x61 0x6C 0x6F (hex representation)
...
Cannot set some HTTP headers when using System.Net.WebRequest
... method which solves the problem by allowing you to set any header via its string name.
Usage
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
request.SetRawHeader("content-type", "application/json");
Extension Class
public static class HttpWebRequestExtensions
{
static s...