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(![]+[])[+[]]… Explain why this works
...'f'
The first part of the expression—between parentheses—is composed by ![]+[], the first operand of the Addition operator is ![] and it will produce false, because an array object—as any other Object instance—is truthy, and applying the Logical (!) NOT unary operator, it produces the valu...
Publish to S3 using Git?
.../.jgit
accesskey: aws access key
secretkey: aws secret access key
Note, by not specifying acl: public in the .jgit file, the git files on S3 will be private (which is what we wanted). Next create an S3 bucket to store your repository in, let’s call it git-repos, and then create a git repository...
MySQL JOIN the most recent row only?
...d, customer_id
FROM customer_data
GROUP BY customer_id
) c_max ON (c_max.customer_id = c.customer_id)
JOIN customer_data cd ON (cd.id = c_max.max_id)
WHERE CONCAT(title, ' ', forename, ' ', surname) LIKE '%Smith%'
LIMIT 10, 20;
Note that ...
How Should I Declare Foreign Key Relationships Using Code First Entity Framework (4.1) in MVC3?
...
You can define foreign key by:
public class Parent
{
public int Id { get; set; }
public virtual ICollection<Child> Childs { get; set; }
}
public class Child
{
public int Id { get; set; }
// This will be recognized as FK by Navigatio...
How to remove all callbacks from a Handler?
I have a Handler from my sub-Activity that was called by the main Activity . This Handler is used by sub-classes to postDelay some Runnables, and I can't manage them. Now, in the onStop event, I need to remove them before finishing the Activity (somehow I called finish() , but it still call ...
Cryptic “Script Error.” reported in Javascript in Chrome and Firefox
...14): You can now enable full cross-domain error reporting on some browsers by specifying a crossorigin attribute on script tags and having the server send the appropriate CORS HTTP response headers.
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Inheriting constructors
...e inherited in the C++03 standard. You needed to inherit them manually one by one by calling base implementation on your own.
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How accurate is python's time.sleep()?
... you can try out a pseudo real-time kernel (with the RT_PREEMPT patch set) by installing the rt kernel package (at least in Ubuntu 10.04 LTS).
EDIT: Correction non-realtime Linux kernels have minimum sleep interval much closer to 1ms then 10ms but it varies in a non-deterministic manner.
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How do I get the filepath for a class in Python?
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Note: does not work on a classes created by the user
– Daniel Braun
Mar 20 '19 at 14:08
7
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How does lucene index documents?
... Lucene does not (necessarily) load all indexed terms to RAM, as described by Michael McCandless, the author of Lucene's indexing system himself. Note that by using Skip-Lists, the index can be traversed from one hit to another, making things like set and, particularly, range queries possible (much ...