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What is the difference between __init__ and __call__?
...ialise newly created object, and receives arguments used to do that:
class Foo:
def __init__(self, a, b, c):
# ...
x = Foo(1, 2, 3) # __init__
The second implements function call operator.
class Foo:
def __call__(self, a, b, c):
# ...
x = Foo()
x(1, 2, 3) # __call__
...
When do we need curly braces around shell variables?
...ence. However, the {} in ${} are useful if you want to expand the variable foo in the string
"${foo}bar"
since "$foobar" would instead expand the variable identified by foobar.
Curly braces are also unconditionally required when:
expanding array elements, as in ${array[42]}
using parameter exp...
What is a higher kinded type in Scala?
...n also be spelled (* ⇒ *) ⇒ * ⇒ *. It can be expressed in Scala like Foo[F[_], T]. This the kind of a type like (in Haskell) newtype Twice f a = Twice (f (f a)) (e.g., Twice Maybe Int ≅ Maybe (Maybe Int), Twice [] Char ≅ [[Char]]) or something more interesting like the free monad data Free...
CMake link to external library
...
I assume you want to link to a library called foo, its filename is usually something link foo.dll or libfoo.so.
1. Find the library
You have to find the library. This is a good idea, even if you know the path to your library. CMake will error out if the library vanished...
git - Find commit where file was added
Say I have a file foo.js that was committed some time ago. I would like to
simply find the commit where this file was first added.
...
How do I create a simple 'Hello World' module in Magento?
...ou want to match this url
http://example.com/magento/index.php/helloworld/foo
You will have to have a FooController, which you can do this way :
touch app/code/local/MyCompanyName/HelloWorld/controllers/FooController.php
<?php
class MyCompanyName_HelloWorld_FooController extends Mage_Core_C...
Why aren't python nested functions called closures?
...f printer():
print msg
return printer
printer = make_printer('Foo!')
printer()
When make_printer is called, a new frame is put on the stack with the compiled code for the printer function as a constant and the value of msg as a local. It then creates and returns the function. Because ...
Detecting an undefined object property
...ndefined" on the global object was writeable, and therefore a simple check foo === undefined might behave unexpectedly if it had accidentally been redefined. In modern JavaScript, the property is read-only.
However, in modern JavaScript, "undefined" is not a keyword, and so variables inside functio...
Propagate all arguments in a bash shell script
... you actually wish your parameters to be passed the same.
Observe:
$ cat foo.sh
#!/bin/bash
baz.sh $@
$ cat bar.sh
#!/bin/bash
baz.sh "$@"
$ cat baz.sh
#!/bin/bash
echo Received: $1
echo Received: $2
echo Received: $3
echo Received: $4
$ ./foo.sh first second
Received: first
Received: second
Re...
Best way to initialize (empty) array in PHP
... been noted that initializing a new array is faster if done like this var foo = [] rather than var foo = new Array() for reasons of object creation and instantiation. I wonder whether there are any equivalences in PHP?
...