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What's an elegant way to conditionally add a class to an HTML element in a view?
...sses where the boolean value evaluated to true.
Sample Usage
class_names(foo: true, bar: false, baz: some_truthy_variable)
# => "foo baz"
Other Use Cases
This helper can be used within ERB tags or with Rails helpers such as link_to.
<div class="<%= class_string(ok: @success) %>">...
Easiest way to pass an AngularJS scope variable from directive to controller?
..."MyCtrl">
<h2>Parent Scope</h2>
<input ng-model="foo"> <i>// Update to see how parent scope interacts with component scope</i>
<br><br>
<!-- attribute-foo binds to a DOM attribute which is always
a string. That is why we are wra...
Are there benefits of passing by pointer over passing by reference in C++?
...less chance for bugs". When inspecting the call site and the reader sees "foo( &s )" it is immediately clear that s may be modified. When you read "foo( s )" it is not at all clear if s may be modified. This is a major source of bugs. Perhaps there is less chance of a certain class of bugs, ...
What's the difference between == and .equals in Scala?
...w ArrayList() will return false, as both arguments are different instances
foo equals foo will return true, unless foo is null, then will throw a NullPointerException
foo == foo will return true, even if foo is null
foo eq foo will return true, since both arguments link to the same reference
...
How do I write good/correct package __init__.py files
... start. I think it's best to leave __init__.py files empty.
for example:
foo.py - contains classes related to foo such as fooFactory, tallFoo, shortFoo
then the app grows and now it's a whole folder
foo/
__init__.py
foofactories.py
tallFoos.py
shortfoos.py
mediumfoos.py
...
MongoDB: update every document on one field
I have a collected named foo hypothetically.
4 Answers
4
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What is the difference between “ is None ” and “ ==None ”
...
class Foo:
def __eq__(self,other):
return True
foo=Foo()
print(foo==None)
# True
print(foo is None)
# False
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When should I make explicit use of the `this` pointer?
...A {
int i;
};
template<class T>
struct B : A<T> {
int foo() {
return this->i;
}
};
int main() {
B<int> b;
b.foo();
}
If you omit this->, the compiler does not know how to treat i, since it may or may not exist in all instantiations of A. In or...
is_null($x) vs $x === null in PHP [duplicate]
...is_null or === null. But be aware when using isset on arrays.
$a = array('foo' => null);
var_dump(isset($a['foo'])); // false
var_dump(is_null($a['foo'])); // true
var_dump(array_key_exists('foo', $a)); // true
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Prevent HTML5 video from being downloaded (right-click saved)?
...
People could record their entire screen and audio and fool all workarounds, that is why they can only be slowed down.
– kintsukuroi
Apr 28 at 6:11
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