A simple plugin which interacts with REPLs in a language agnostic way.
I highly recommend that you install replicate.nvim with a plugin manager such as vim-plug. Each manager has a slightly different way of working so see the specific manager's help, for example in vim-plug you would put
Plug 'Sean1708/replicate.nvim'
in your init.vim (usually $HOME/.config/nvim/init.vim) and run
:PlugUpdate
to automatically install it.
Alternatively you can use a runtimepath manager such as pathogen or, if you're particularly masochistic, you can even install it manually.