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Split comma-separated strings in a column into separate rows
...act on timings. Since R 4.0.0, the default, when creating a data.frame, is stringsAsFactors = FALSE, so as.character could be removed.
– GKi
Jun 18 at 14:23
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...
A good example for boost::algorithm::join
...
#include <boost/algorithm/string/join.hpp>
#include <vector>
#include <iostream>
int main()
{
std::vector<std::string> list;
list.push_back("Hello");
list.push_back("World!");
std::string joined = boost::algorith...
Nullable ToString()
...question, the former solution is suggested while nobody actually notices ToString() already gives the correct answer.
Maybe the argument for the more verbose solution is readability: When you call ToString() on something that is supposed to be null, you usually expect a NullReferenceException, alth...
What is a stack trace, and how can I use it to debug my application errors?
...this, we can open up Book.java and look at line 16, which is:
15 public String getTitle() {
16 System.out.println(title.toString());
17 return title;
18 }
This would indicate that something (probably title) is null in the above code.
Example with a chain of exceptions
Sometimes ap...
How to change a field name in JSON using Jackson
...ed using @JsonProperty?
@Entity
public class City {
@id
Long id;
String name;
@JsonProperty("label")
public String getName() { return name; }
public void setName(String name){ this.name = name; }
@JsonProperty("value")
public Long getId() { return id; }
public void se...
Passing Data between View Controllers
...oryboardSegue *)segue sender:(id)sender{
if([segue.identifier isEqualToString:@"showDetailSegue"]){
ViewControllerB *controller = (ViewControllerB *)segue.destinationViewController;
controller.isSomethingEnabled = YES;
}
}
If you have your views embedded in a navigation con...
xtree(1796): warning C4800: “int”: 将值强制为布尔值“true”或“false...
..._Tree_iterator<std::_Tree_val<std::_Tree_simple_types<std::pair<const std::string,CPTCensorStatusItem *>>>>,
1> _Ty2=bool,
1> _Traits=std::_Tmap_traits<std::string,CPTCensorStatusItem *,CGraphFrame::Compare<std::string>,std::allocator<std::pair<const std::string,CPTCensor...
How to create a GUID/UUID using iOS
...If you need to create several UUID, just use this method (with ARC):
+ (NSString *)GetUUID
{
CFUUIDRef theUUID = CFUUIDCreate(NULL);
CFStringRef string = CFUUIDCreateString(NULL, theUUID);
CFRelease(theUUID);
return (__bridge NSString *)string;
}
EDIT: Jan, 29 2014:
If you're targeting iO...
RESTful Authentication via Spring
..., ServletException {
@SuppressWarnings("unchecked")
Map<String, String[]> parms = request.getParameterMap();
if(parms.containsKey("token")) {
String token = parms.get("token")[0]; // grab the first "token" parameter
// validate the token
...
Printing HashMap In Java
...u should change it to :
for (TypeKey name: example.keySet()){
String key = name.toString();
String value = example.get(name).toString();
System.out.println(key + " " + value);
}
Update for Java8:
example.entrySet().forEach(entry->{
System.out.prin...