To get the value of the selected radio name item with a form id my form
***
$('input[name=radioName]:checked', '#myForm').val()
***

You can get the list of files in a directory Using the following code:
***
#include
#include
#include
namespace fs = std::filesystem;

int main()
{
std::string path = "/path/to/directory";
for (const auto & entry : fs::directory_iterator(path))
std::cout << entry.path() << std::endl;
}
***

You can get the header as a list by simply using this one-liner code.
***
list(df.columns)
***

To move the column mean to first, You can use methods like deque() and rotate(). Let us see how?
***
from collections import deque

columns = deque(df.columns.tolist())
columns.rotate()

df = df[columns]

***

You can use filter method to remove item from array in javascript.
For example:
***
let array= [5,10,12,3,4];

let value=12;
array = array.filter(element => element !== value);
console.log(array)
***

Modern browsers have Array#includes, which does exactly that and is widely supported by everyone except IE:

**console.log(['joe', 'jane', 'mary'].includes('jane')); //true**

You can also use Array#indexOf, which is less direct but doesn't require polyfills for outdated browsers.

**console.log(['joe', 'jane', 'mary'].indexOf('jane') >= 0); //true**

To create a symbolic link /soft link, use:

** ln -s {source-filename} {symbolic-filename} **

where ln is link command and -s flag specifies a soft command.

For example

** ln -s file1 link1 **

if you want to change permissions of all files and directories at once.
use
**chmod -R 755 /opt/lampp/htdocs **

if the number of files you are using is very large. Use

** find /opt/lampp/htdocs -type d -exec chmod 755 {} \;**

Otherwise use

** chmod 755 $(find /path/to/base/dir -type d)**

For recursive search invoke grep with the -r option or --recursive. Here is an example to find pattern in a given directory.
** $grep -r "pattern/directory_name" **

You can also run this script to find out the Apache process owner:

****

And then change the owner of the destination directory to what you've got. Use the command:

**chown user destination_dir**

And then use the command

**chmod 755 destination_dir**

to change the destination directory permission.

Use exactly six hexadecimal digits for the escape sequence:
***
.breadcrumbs a:before {
content: '\0000a0foo';
}
***

There are two different things here: the style of the iframe block and the style of the page embedded in the iframe. You can set the style of the iframe block the usual way:
***

***
The style of the page embedded in the iframe must be either set by including it in the child page:

****

Or it can be loaded from the parent page with Javascript:
***
var cssLink = document.createElement("link");
cssLink.href = "style.css";
cssLink.rel = "stylesheet";
cssLink.type = "text/css";
frames['iframe1'].document.head.appendChild(cssLink);
***