How to duplicate a whole line in Vim?

Question

How do I duplicate a whole line in Vim in a similar way to Ctrl+D in IntelliJ IDEA/ Resharper or Ctrl+Alt+&

Answer 1

If you would like to duplicate a line and paste it right away below the current like, just like in Sublime Ctrl+Shift+D, then you can add this to your .vimrc file.

nmap Yp

Or, for Insert mode:

imap Ypa