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What are free monads?
...
A free foo happens to be the simplest thing that satisfies all of the 'foo' laws. That is to say it satisfies exactly the laws necessary to be a foo and nothing extra.
A forgetful functor is one that "forgets" part of the structure...
Strings are objects in Java, so why don't we use 'new' to create them?
... reference will point to the canonical String instance.
String a = "foo";
String b = "foo";
System.out.println(a == b); // true
String c = new String(a
What's the difference between isset() and array_key_exists()? [duplicate]
...
@Zacky Japanese. And it just says 'foobar'.
– deceze♦
Jul 9 '10 at 12:03
18
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Unix shell script find out which directory the script file resides?
...sh, ksh:
#!/bin/bash
# Absolute path to this script, e.g. /home/user/bin/foo.sh
SCRIPT=$(readlink -f "$0")
# Absolute path this script is in, thus /home/user/bin
SCRIPTPATH=$(dirname "$SCRIPT")
echo $SCRIPTPATH
For tcsh, csh:
#!/bin/tcsh
# Absolute path to this script, e.g. /home/user/bin/foo.c...
What is the difference between JOIN and UNION?
...example of JOIN:
mysql> SELECT * FROM
-> (SELECT 23 AS bah) AS foo
-> JOIN
-> (SELECT 45 AS bah) AS bar
-> ON (33=33);
+-----+-----+
| foo | bar |
+-----+-----+
| 23 | 45 |
+-----+-----+
1 row in set (0.01 sec)
...
Traits vs. interfaces
...
interface Person
{
public function greet();
public function eat($food);
}
trait EatingTrait
{
public function eat($food)
{
$this->putInMouth($food);
}
private function putInMouth($food)
{
// Digest delicious food
}
}
class NicePerson implements...
Convert string to title case with JavaScript
...s my version, IMO it's easy to understand and elegant too.
var str = "foo bar baz"
console.log(
str.split(' ')
.map(w => w[0].toUpperCase() + w.substr(1).toLowerCase())
.join(' ')
)
// returns "Foo Bar Baz"
...
Are there strongly-typed collections in Objective-C?
...s in your generic ObjC class. If you specify constraints, e.g. MyClass <Foo: id<Bar>>, your Swift code will assume values are the type of your constraint, which gives you something to work with. However, specialized subclasses of MyClass would have their specialized types ignored (be se...
How to change identity column values programmatically?
... PRIMARY KEY,
X VARCHAR(10)
)
INSERT INTO Test
OUTPUT INSERTED.*
SELECT 'Foo' UNION ALL
SELECT 'Bar' UNION ALL
SELECT 'Baz'
Then you can do
/*Define table with same structure but no IDENTITY*/
CREATE TABLE Temp
(
ID INT PRIMARY KEY,
X VARCHAR(10)
)
/*Switch table metadata to new structure*/
AL...
Setting Curl's Timeout in PHP
...elf causing a 10-second delay so you can test timeouts:
if (!isset($_GET['foo'])) {
// Client
$ch = curl_init('http://localhost/test/test_timeout.php?foo=bar');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_NOSIGNAL, 1);
curl_setopt($ch, CURLOPT_TIMEOU...