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Delete a key from a MongoDB document using Mongoose
... collection out.
– staackuser2
Nov 13 '11 at 22:30
4
Either use User.update({ _id: id }, { $unset...
How to check if a char is equal to an empty space?
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Nikita RybakNikita Rybak
63.3k2121 gold badges147147 silver badges170170 bronze badges
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List all environment variables from the command line
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1381
Just do:
SET
You can also do SET prefix to see all variables with names starting with prefi...
Pointer to pointer clarification
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143
Forget for a second about the pointing analogy. What a pointer really contains is a memory addr...
Fundamental difference between Hashing and Encryption algorithms
...ed length (or smaller length) output. It can be anything from a simple crc32, to a full blown cryptographic hash function such as MD5 or SHA1/2/256/512. The point is that there's a one-way mapping going on. It's always a many:1 mapping (meaning there will always be collisions) since every functio...
Omitting all xsi and xsd namespaces when serializing an object in .NET?
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XmlSerializer s = new XmlSerializer(objectToSerialize.GetType());
XmlSerializerNamespaces n...
How do you change the datatype of a column in SQL Server?
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573
ALTER TABLE TableName
ALTER COLUMN ColumnName NVARCHAR(200) [NULL | NOT NULL]
EDIT
As noted N...
How to implement static class member functions in *.cpp file?
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Sam
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answered Mar 21 '11 at 2:04
CromTheDestroyerCromTheDestroyer
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Where and why do I have to put the “template” and “typename” keywords?
... type, it will be a multiplication. So the C++ Standard says at paragraph (3/7):
Some names denote types or templates. In general, whenever a name is encountered it is necessary to determine whether that name denotes one of these entities before continuing to parse the program that contains it. ...
Should functions return null or an empty object?
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