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What is the use case of noop [:] in bash?
...ts when I comment out all the code. For example you have a test:
if [ "$foo" != "1" ]
then
echo Success
fi
but you want to temporarily comment out everything contained within:
if [ "$foo" != "1" ]
then
#echo Success
fi
Which causes bash to give a syntax error:
line 4: syntax error ...
Can I extend a class using more than 1 class in PHP?
...user_func_array(array($extender, $name), $params);
}
}
}
}
$foo = new Extendable();
$foo->addExtender(new OtherClass());
$foo->other_class_method();
Note that in this model "OtherClass" gets to 'know' about $foo. OtherClass needs to have a public function called "setExtendee"...
What is the difference between `let` and `var` in swift?
...constant it's not much of one. This works just fine in the compiler: let foo = [1,2,3]; foo[2] = 5; println("(foo)") // [1, 2, 5]
– Kevin Frost
Jun 11 '14 at 20:47
...
Access parent URL from iframe
...ggestion. For those who are writing the parent html iframe code this would foot the bill. We used something very similar in our pixel software.
– Ligemer
Nov 25 '14 at 0:30
...
How to create a directory using Ansible
...ound that it changes child files permissions also... almost like mkdir -p /foo/bar && chmod -R 0775 /foo/bar.. has anyone else observed this with Ansible 2.0.0.2
– ThePracticalOne
May 11 '16 at 14:04
...
When is del useful in python?
...ly, using del on a local variable makes the intent clearer. Compare:
del foo
to
foo = None
I know in the case of del foo that the intent is to remove the variable from scope. It's not clear that foo = None is doing that. If somebody just assigned foo = None I might think it was dead code. But...
What does the `forall` keyword in Haskell/GHC do?
...
Let's start with a code example:
foob :: forall a b. (b -> b) -> b -> (a -> b) -> Maybe a -> b
foob postProcess onNothin onJust mval =
postProcess val
where
val :: b
val = maybe onNothin onJust mval
This code doesn...
How do I get jQuery to select elements with a . (period) in their ID?
...id selector if the id contains spaces. Use an attribute selector:
$('[id=foo bar]').show();
If possible, specify element type as well:
$('div[id=foo bar]').show();
share
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improve this answer
...
Ruby class instance variable vs. class variable
...(or rather, a subclass of Class) corresponding to it. (When you say class Foo, you're really declaring a constant Foo and assigning a class object to it.) And every Ruby object can have instance variables, so class objects can have instance variables, too.
The trouble is, instance variables on cla...
How do I remove a property from a JavaScript object?
... delete operator is used to remove properties from objects.
const obj = { foo: "bar" }
delete obj.foo
obj.hasOwnProperty("foo") // false
Note that, for arrays, this is not the same as removing an element. To remove an element from an array, use Array#splice or Array#pop. For example:
arr // [0, ...