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How do I implement an Objective-C singleton that is compatible with ARC?
...n;
dispatch_once(&onceToken, ^{
sharedInstance = [[MyClass alloc] init];
// Do any other initialisation stuff here
});
return sharedInstance;
}
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Get value from JToken that may not exist (best practices)
...e GetValue as below
public static T GetValue<T>(this JToken jToken, string key, T defaultValue = default(T))
{
dynamic ret = jToken[key];
if (ret == null) return defaultValue;
if (ret is JObject) return JsonConvert.DeserializeObject<T>(ret.ToString());
return (T)ret;
}
...
How to overcome “datetime.datetime not JSON serializable”?
...ult=json_util.default)
Example usage (deserialization):
json.loads(aJsonString, object_hook=json_util.object_hook)
Django
Django provides a native DjangoJSONEncoder serializer that deals with this kind of properly.
See https://docs.djangoproject.com/en/dev/topics/serialization/#djangojsonen...
What Vim command(s) can be used to quote/unquote words?
...tes.
Change single quotes to double quotes
va':s/\%V'\%V/"/g
va' - Visually select the quoted word and the quotes.
:s/ - Start a replacement.
\%V'\%V - Only match single quotes that are within the visually selected region.
/"/g - Replace them all with double quotes.
...
Are static methods inherited in Java?
... of this class");
}
}
public class Test {
public static void main(String[] args) {
B b = new B();
// prints: Inside static method of this class
b.display();
A a = new B();
// prints: Inside static method of superclass
a.display();
}
}
T...
Is there a way to get the source code from an APK file?
The hard drive on my laptop just crashed and I lost all the source code for an app that I have been working on for the past two months.
All I have is the APK file that is stored in my email from when I sent it to a friend.
...
How do I replace the *first instance* of a string in .NET?
I want to replace the first occurrence in a given string.
14 Answers
14
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Use of Java's Collections.singletonList()?
...import java.util.*;
public class HelloWorld {
public static void main(String args[]) {
// create an array of string objs
String initList[] = { "One", "Two", "Four", "One",};
// create one list
List list = new ArrayList(Arrays.asList(initList));
System.o...
How to get MVC action to return 404
I have an action that takes in a string that is used to retrieve some data. If this string results in no data being returned (maybe because it has been deleted), I want to return a 404 and display an error page.
...
How can I display an image from a file in Jupyter Notebook?
...y? (Don't tell me that otherwise it doesn't work. Please explain why this call to 'display' is needed in a loop but not if you just dispaly one image).
– Kris
May 1 '17 at 1:25
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