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Java: random long number in 0
...odify this to perform nextLong:
long nextLong(Random rng, long n) {
// error checking and 2^x checking removed for simplicity.
long bits, val;
do {
bits = (rng.nextLong() << 1) >>> 1;
val = bits % n;
} while (bits-val+(n-1) < 0L);
return val;
}
...
How to read a file line-by-line into a list?
...Big Data using readlines() is not very efficient as it can result in MemoryError. In this case it is better to iterate over the file using for line in f: and working with each line variable.
– DarkCygnus
Aug 27 '16 at 3:07
...
Quick way to list all files in Amazon S3 bucket?
...
If you get: boto.exception.S3ResponseError: S3ResponseError: 403 Forbidden Make sure the user policy for the Access/Secret key has access to the S3.
– topherjaynes
May 27 '14 at 23:44
...
Bootstrap Modal immediately disappearing
...ed Sep 11 '14 at 11:42
Rory HunterRory Hunter
3,0171111 silver badges1616 bronze badges
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SQL Server Insert if not exists
...
You need to handle errors for this procedure because there will be cases where an insert will happen between the check and insert.
– Filip De Vos
Jan 7 '14 at 12:53
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Images can't contain alpha channels or transparencies
Apple has released new version of iTunes Connect & I got an error message when I tried to set Screenshots on itunes connect for my app.
...
JavaScript “new Array(n)” and “Array.prototype.map” weirdness
...native object in JavaScript, it returns undefined (rather than throwing an error, as happens when you try to refer to a non-existent variable), which is the same as what you get if the property has previously been explictly set to undefined.
...
How to trigger event in JavaScript?
...eType 9 = DOCUMENT_NODE
doc = node;
} else {
throw new Error("Invalid node passed to fireEvent: " + node.id);
}
if (node.dispatchEvent) {
// Gecko-style approach (now the standard) takes more work
var eventClass = "";
// Different events have dif...
How do I use PHP namespaces with autoload?
I get this error when I try to use autoload and namespaces:
13 Answers
13
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Django REST Framework: adding additional field to ModelSerializer
...e field you want to add. No need for @property and source='field' raise an error.
class Foo(models.Model):
. . .
def foo(self):
return 'stuff'
. . .
class FooSerializer(ModelSerializer):
foo = serializers.ReadOnlyField()
class Meta:
model = Foo
fields =...