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In mongoDb, how do you remove an array element by its index?
... open issue http://jira.mongodb.org/browse/SERVER-1014 , you may vote for it.
The workaround is using $unset and then $pull:
db.lists.update({}, {$unset : {"interests.3" : 1 }})
db.lists.update({}, {$pull : {"interests" : null}})
Update: as mentioned in some of the comments this approach is no...
How to detect internet speed in JavaScript?
...te a JavaScript page that will detect the user’s internet speed and show it on the page? Something like “your internet speed is ??/?? Kb/s” .
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What is the meaning of id?
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id is a pointer to any type, but unlike void * it always points to an Objective-C object. For example, you can add anything of type id to an NSArray, but those objects must respond to retain and release.
The compiler is totally happy for you to implicitly cast any object...
How do you create a dropdownlist from an enum in ASP.NET MVC?
...e the Html.DropDownList extension method but can't figure out how to use it with an enumeration.
36 Answers
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How does functools partial do what it does?
...unction (a callable, to be precise) that behaves like sum2, but has one positional argument less. That missing argument is always substituted by 4, so that partial(sum2, 4)(2) == sum2(4, 2)
As for why it's needed, there's a variety of cases. Just for one, suppose you have to pass a function somewhe...
What are the most common SQL anti-patterns? [closed]
All of us who work with relational databases have learned (or are learning) that SQL is different. Eliciting the desired results, and doing so efficiently, involves a tedious process partly characterized by learning unfamiliar paradigms, and finding out that some of our most familiar programming p...
Hibernate - A collection with cascade=”all-delete-orphan” was no longer referenced by the owning ent
I'm having the following issue when trying to update my entity:
23 Answers
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Difference between char* and const char*?
...const char * to char* is deprecated.
char* const is an immutable pointer (it cannot point to any other location) but the contents of location at which it points are mutable.
const char* const is an immutable pointer to an immutable character/string.
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Python memory leaks [closed]
...dule actually can have debug flags set. Look at the set_debug function. Additionally, look at this code by Gnibbler for determining the types of objects that have been created after a call.
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How to add images to README.md on GitHub?
Recently I joined GitHub . I hosted some projects there.
32 Answers
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