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How to remove a field completely from a MongoDB document?
Suppose this is a document. How do I remove " words " completely from all the documents in this collection? I want all documents to be without " words ":
...
In Objective-C why should I check if self = [super init] is not nil?
..., but this isn't INSIDE the respective class' init method. NSData inherits from NSObject. Does NSData check if [super init] returns nil? That's what I'm asking here. Sorry if I wasn't clear...
– Jasarien
Aug 17 '09 at 13:33
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JavaScript: Class.method vs. Class.prototype.method
... sayHi is an instance method of Person.
Below, is how to create an object from Person constructor.
var aminu = new Person("Aminu", "Abubakar");
Using the static method isPerson.
Person.isPerson(aminu); // will return true
Using the instance method sayHi.
aminu.sayHi(); // will return "Hi Aminu...
Why / when would it be appropriate to override ToString?
...
I'm just going to give you the answer straight from the Framework Design Guidelines from the .NET Development Series.
AVOID throwing exceptions from ToString
CONSIDER returning a unique string associated with the instance.
CONSIDER having the output of ToString be a ...
Advantages and disadvantages of GUID / UUID database keys
...ORM's usually like them
Unique across applications. So We can use the PK's from our CMS (guid) in our app (also guid) and know we are NEVER going to get a clash.
Disadvantages:
Larger space use, but space is cheap(er)
Can't order by ID to get the insert order.
Can look ugly in a URL, but really,...
How to prevent multiple instances of an Activity when it is launched with different Intents
...y Store app (previously called Android Market). It seems that launching it from the Play Store uses a different Intent than launching it from the phone's application menu of icons. This is leading to multiple copies of the same Activity being launched, which are conflicting with each other.
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What is the reason behind “non-static method cannot be referenced from a static context”? [duplicate
...to any object. Hence there is no way a non-static method can be referenced from static context.
– Saathvik
Feb 22 '18 at 7:00
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show 2 more ...
Calculate date from week number
... var result = firstThursday.AddDays(weekNum * 7);
// Subtract 3 days from Thursday to get Monday, which is the first weekday in ISO8601
return result.AddDays(-3);
}
share
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improve...
Defining custom attrs
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If you are using custom attrs from a library project: see this question: stackoverflow.com/questions/5819369/… - It seems to work if you use xmlns:my="http://schemas.android.com/apk/lib/my.namespace" - no copying attrs.xml. Note the namespace URI path ...
When is JavaScript synchronous?
... functions. When the called function exits its execution context is popped from the stack, and then next execution context is popped and so on...
For example
function abc()
{
console.log('abc');
}
function xyz()
{
abc()
console.log('xyz');
}
var one = 1;
xyz();
In the above code a g...