Codi is an interactive scratchpad for hackers, with a similar interface to Numi. It opens a pane synchronized to your main buffer which displays the results of evaluating each line as you type (with NeoVim or Vim with +job and +channel, asynchronously). It’s extensible to nearly any language that provides a REPL (interactive interpreter)!
Languages with built-in support: Python, JavaScript, CoffeeScript, Haskell, PureScript, Ruby, OCaml, R, Clojure/ClojureScript, PHP, Lua, C++, Julia, Elm, Elixir, TypeScript, Mathjs
Installation
Plug 'metakirby5/codi.vim'