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Why do we need the “event” keyword while defining events?
...a class. It is indeed a reference type
public delegate void MyDelegate(string inputs);
//The following line is illegal. It can only be an instance. so it cannot be directly under namespace
//public event MyDelegate MyEvent;
public class MyClassA
{
public event MyDelega...
MySQL date format DD/MM/YYYY select query?
...
You can use STR_TO_DATE() to convert your strings to MySQL date values and ORDER BY the result:
ORDER BY STR_TO_DATE(datestring, '%d/%m/%Y')
However, you would be wise to convert the column to the DATE data type instead of using strings.
...
Is it possible to solve the “A generic array of T is created for a varargs parameter” compiler warni
...ple.ArgBuilder.*;
public class VarargsTest {
public static void main(String[] args) {
doSomething(new ArgBuilder<String>().and("foo").and("bar").and("baz"));
// or
doSomething(with("foo").and("bar").and("baz"));
}
static void doSomething(Iterable<Strin...
Unpack a list in Python?
...
function_that_needs_strings(*my_list) # works!
You can read all about it here.
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Read entire file in Scala?
...
val lines = scala.io.Source.fromFile("file.txt").mkString
By the way, "scala." isn't really necessary, as it's always in scope anyway, and you can, of course, import io's contents, fully or partially, and avoid having to prepend "io." too.
The above leaves the file open, h...
Python strptime() and timezones?
...umpfile from a Blackberry IPD backup, created using IPDDump.
The date/time strings in here look something like this
(where EST is an Australian time-zone):
...
How to detect the OS from a Bash script?
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From a quick glance, the backticks could resemble a string.
– Harrison Powers
Mar 31 '14 at 0:53
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What is cURL in PHP?
.... Set option for CURLOPT_RETURNTRANSFER. True will tell curl to return the string instead of print it out. Set option for CURLOPT_HEADER, false will tell curl to ignore the header in the return value.
Step 3: Execute the curl session using curl_exec().
Step 4: Close the curl session we have create...
TypeError: unhashable type: 'dict'
...e the keys have to be hashable. As a general rule, only immutable objects (strings, integers, floats, frozensets, tuples of immutables) are hashable (though exceptions are possible). So this does not work:
>>> dict_key = {"a": "b"}
>>> some_dict[dict_key] = True
Traceback (most re...
Symfony2 : How to get form validation errors after binding the request to the form
...s($child);
}
}
return $errors;
}
To get all errors as a string:
$string = var_export($this->getErrorMessages($form), true);
Symfony 2.5 / 3.0:
$string = (string) $form->getErrors(true, false);
Docs:
https://github.com/symfony/symfony/blob/master/UPGRADE-2.5.md#form
h...