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Uploading base64 encoded Image to Amazon S3 via Node.js
...e file
buf = Buffer.from(req.body.imageBinary.replace(/^data:image\/\w+;base64,/, ""),'base64')
var data = {
Key: req.body.userId,
Body: buf,
ContentEncoding: 'base64',
ContentType: 'image/jpeg'
};
s3Bucket.putObject(data, function(err, data){
if (err) {
cons...
What's is the difference between include and extend in use case diagram?
...w between use cases is a dependency relationship. I’ll use the terms ‘base’, ‘included’ and ‘extending’ to refer to the use case roles.
include
A base use case is dependent on the included use case(s); without it/them the base use case is incomplete as the included use case(s) repre...
Pandas selecting by label sometimes return Series, sometimes returns DataFrame
...duces instances that have a particular structure originated in the NDFrame base class, itself derived from the PandasContainer base class that is also a parent class of the Series class.
Note that this is correct for Pandas until version 0.12. In the upcoming version 0.13, Series will derive also f...
How do I create a URL shortener?
... MySQL table for example).
For this example, I will use 12510 (125 with a base of 10).
Now you have to convert 12510 to X62 (base 62).
12510 = 2×621 + 1×620 = [2,1]
This requires the use of integer division and modulo. A pseudo-code example:
digits = []
while num > 0
remainder = modulo(n...
Creating an instance using the class name and calling constructor
...ption {
// Get class name as string.
String myClassName = Base.class.getName();
// Create class of type Base.
Class<?> myClass = Class.forName(myClassName);
// Create constructor call with argument types.
Constructor<?> ctr = myClass.getCo...
Is there any particular difference between intval and casting to int - `(int) X`?
...
intval() can be passed a base from which to convert. (int) cannot.
int intval( mixed $var [, int $base = 10 ] )
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Zero-based month numbering [closed]
...e of zero is also popular with pointer arithmetics where you would use one base pointer pointing at some allocated memory, plus a second pointer which would be at an offset from this base pointer. Here, using the value zero makes a lot of sense to point the offset to the base of the memory block. (G...
Are inline virtual functions really a non-sense?
...
void f(const Base& lhs, const Base& rhs) { } ------In implementation of the function, you never know what lhs and rhs points to until runtime.
– Baiyan Huang
Aug 11 '10 at 23:44
...
Difference between private, public, and protected inheritance
... accessors that I'm aware of: public, protected and private.
Let:
class Base {
public:
int publicMember;
protected:
int protectedMember;
private:
int privateMember;
};
Everything that is aware of Base is also aware that Base contains publicMember.
Only the c...
C# constructor execution order
...re executed for the most-derived type
Constructor chaining works out which base class constructor is going to be called
The base class is initialized (recurse all of this :)
The constructor bodies in the chain in this class are executed (note that there can be more than one if they're chained with F...