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“unrecognized selector sent to instance” error in Objective-C
...ction:@selector(xxxButtonClick:)
or (as in my case)
action:NSSelectorFromString([[NSString alloc] initWithFormat:@"%@BtnTui:", name.lowercaseString])
If you place a colon at the end of the string - it will pass the sender. If you do not place the colon at the end of the string it will not, and t...
Class vs. static method in JavaScript
...: primitive values—which include undefined, null, booleans, numbers, and strings—aren't technically objects because they're low-level language implementations. Booleans, numbers, and strings still interact with the prototype chain as though they were objects, so for the purposes of this answer, ...
Add a new element to an array without specifying the index in Bash
... that ARRAY+=('foo') is way different than ARRAY+='foo', which appends the string 'foo' to the entry with the lowest(?) key.
– TheConstructor
May 3 '13 at 13:17
8
...
How is std::function implemented?
...;
}
};
// examples
int main()
{
int i = 0;
auto fn = [i](std::string const& s) mutable
{
std::cout << ++i << ". " << s << std::endl;
};
fn("first"); // 1. first
fn("second"); ...
How to align input forms in HTML
..., in a two-dimensional structure.
[consider what you would do if you had string or numeric values to display instead of input boxes.]
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Async image loading from url inside a UITableView cell - image changes to wrong image while scrollin
...= [UIImage imageNamed:@"placeholder.png"];
NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://myurl.com/%@.jpg", self.myJson[indexPath.row][@"movieId"]]];
NSURLSessionTask *task = [[NSURLSession sharedSession] dataTaskWithURL:url completionHandler:^(NSData * _Nullable da...
Failed to serialize the response in Web API with Json
...make things more confusing.
Example:
public class UserModel {
public string Name {get;set;}
public string Age {get;set;}
// Other properties here that do not reference another UserModel class.
}
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filtering NSArray into a new NSArray in Objective-C
... it may just be easier to convert the function's conditions to a predicate string.
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Node.js Best Practice Exception Handling
...in Error object
TL;DR: It pretty common to see code that throws errors as string or as a custom type – this complicates the error handling logic and the interoperability between modules. Whether you reject a promise, throw exception or emit error – using Node.JS built-in Error object increases ...
Co-variant array conversion from x to y may cause run-time exception
...x(); // compile time legal, runtime exception
And in more general terms
string[] array = new string[10];
object[] objs = array; // legal at compile time
objs[0] = new Foo(); // again legal, with runtime exception
In C#, you are allowed to reference an array of objects (in your case, LinkLabels)...