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HTML5 Video Dimensions
...--- //
/**
Returns the dimensions of a video asynchrounsly.
@param {String} url Url of the video to get dimensions from.
@return {Promise} Promise which returns the dimensions of the video in 'width' and 'height' properties.
*/
function getVideoDimensionsOf(url){
return new Promise(fun...
Showing a Spring transaction in log
...d out, getSpringTransactionInfo() is called and it returns a one-character string that will go into the log.
References:
Tips for Debugging Spring's @Transactional Annotation
org.springframework.transaction.support.TransactionSynchronizationManager
java.lang.ThreadLocal
java.lang.Class.getMethod(...
Difference: std::runtime_error vs std::exception()
...
std::runtime_error on the other hand has valid constructors that accept a string as a message. When what() is called a const char pointer is returned that points at a C string that has the same string as was passed into the constructor.
try
{
if (badThingHappened)
{
throw std::run...
How do I look inside a Python object?
...
the best way to see object and its contents in a string
– Peter Krauss
Dec 28 '19 at 21:57
T...
How to find out element position in slice?
... }
}
return -1
}
And usage:
xs := []int{2, 4, 6, 8}
ys := []string{"C", "B", "K", "A"}
fmt.Println(
SliceIndex(len(xs), func(i int) bool { return xs[i] == 5 }),
SliceIndex(len(xs), func(i int) bool { return xs[i] == 6 }),
SliceIndex(len(ys), func(i int) bool { return ys[i]...
Rails migrations: self.up and self.down versus change
...d only delete this column on down
def up
add_column :users, :location, :string
User.update_all(location: 'Minsk')
end
def down
remove_column :users, :location
end
But:
You had to avoid using change method which allows to save some time. For example, if you didn’t need to update column v...
Lock, mutex, semaphore… what's the difference?
...ic static Semaphore Bouncer { get; set; }
public static void Main(string[] args)
{
// Create the semaphore with 3 slots, where 3 are available.
Bouncer = new Semaphore(3, 3);
// Open the nightclub.
OpenNightclub();
}
...
Calling constructor from other constructor in same class
... the constructor to do 'constructor chaining'
public Test( bool a, int b, string c )
: this( a, b )
{
this.m_C = c;
}
public Test( bool a, int b, float d )
: this( a, b )
{
this.m_D = d;
}
private Test( bool a, int b )
{
this.m_A = a;
this.m_B = b;
}
Source Courtesy of csh...
How to validate an email address in PHP
...ked.com/archive/2007/08/21/… the user name o locally part can be quoted-string, but the FILTER_VALIDATE_EMAIL do not accept it.
– Daniel De León
Mar 22 '13 at 1:08
...
How can I convert JSON to CSV?
... is as easy as using two commands!
pandas.read_json()
To convert a JSON string to a pandas object (either a series or dataframe). Then, assuming the results were stored as df:
df.to_csv()
Which can either return a string or write directly to a csv-file.
Based on the verbosity of previous ans...