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How to append rows to an R data frame
I have looked around StackOverflow, but I cannot find a solution specific to my problem, which involves appending rows to an R data frame.
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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...
Are global variables in PHP considered bad practice? If so, why?
...A common practice is to define global vars using ALL CAPS. example: $DB = 'foo';
– pixeline
Mar 26 '15 at 9:31
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Pointer expressions: *ptr++, *++ptr and ++*ptr
Recently I have come across this problem which I am unable to understand by myself.
10 Answers
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How do I pass extra arguments to a Python decorator?
...to wrap my head around.
class NiceDecorator:
def __init__(self, param_foo='a', param_bar='b'):
self.param_foo = param_foo
self.param_bar = param_bar
def __call__(self, func):
def my_logic(*args, **kwargs):
# whatever logic your decorator is supposed to i...
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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Logical operator in a handlebars.js {{#if}} conditional
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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...
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
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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
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