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How can I add a class to a DOM element in JavaScript?
... .classList.add() method:
const element = document.querySelector('div.foo');
element.classList.add('bar');
console.log(element.className);
<div class="foo"></div>
This method is better than overwriting the className property, because it doesn't remove other classes and doe...
Logical operator in a handlebars.js {{#if}} conditional
...
In fact, we can add all sorts of logic:
{{#if (or
(eq section1 "foo")
(ne section2 "bar"))}}
.. content
{{/if}}
Just register these helpers:
Handlebars.registerHelper({
eq: (v1, v2) => v1 === v2,
ne: (v1, v2) => v1 !== v2,
lt: (v1, v2) => v1 < v2,
gt...
Inheriting from a template class in c++
...lic Rectangle,
public Area<T>
{
// Area dependent stuff
};
void foo(Rectangle&); // A function which works with generic rectangles
int main()
{
SpecificRectangle<int> intrect;
foo(intrect);
SpecificRectangle<char> charrect;
foo(charrect);
}
If it is important t...
Is System.nanoTime() completely useless?
...n WinXP SP2 appears to suffer. Running the original code sample, with void foo() { Thread.sleep(40); } I got a negative time (-380 ms!) using a single Athlon 64 X2 4200+ processor
– Luke Usherwood
Mar 7 '12 at 12:46
...
Parsing a JSON string in Ruby
...rse JSON, simply use require 'json':
require 'json'
json = JSON.parse '{"foo":"bar", "ping":"pong"}'
puts json['foo'] # prints "bar"
See JSON at Ruby-Doc.
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Python: finding an element in a list [duplicate]
...ct attributes (which I need a lot):
el = [x for x in mylist if x.attr == "foo"][0]
Of course this assumes the existence (and, actually, uniqueness) of a suitable element in the list.
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impr...
Can Flask have optional URL parameters?
...rstand how to build the URL properly. You can get something like /page?arg=foo where it should be /foo/page . @Audrius Kažukauskas answer works in that case, but this doesn't
– rgargente
Nov 12 '19 at 16:08
...
How do I decode HTML entities in Swift?
... // decode("&lt;") --> "<"
// decode("&foo;") --> nil
func decode(_ entity : Substring) -> Character? {
if entity.hasPrefix("&#x") || entity.hasPrefix("&#X") {
return decodeNumeric(entity.dropFirst(3).dropLast(...
How to assign the output of a Bash command to a variable? [duplicate]
...erforms globbing on these words. Always double-quote variable expansions "$foo" and command substitutions "$(foo)" (unless you specifically know you have not to).
In the general case, as other answers have mentioned already:
You can't use whitespace around the equal sign in an assignment: var=val...
How to find out where a function is defined?
...PHP 5):
one-liner to print the filename:
print (new ReflectionFunction("foo"))->getFileName();
Please note that it won't show you the location for internal functions (such as _), but it still can print the API for it as below.
to print the definition and parameters of the function:
print...