Comment by dasl

This allows you to use fzf with IRB. It works with anything that uses readline, which IRB uses. https://github.com/lincheney/rl_custom_isearch

it works for me on linux, not sure about other OS's. Although I'm now noticing that the article linked in the original post says that Ruby has a pure Ruby replacement for readline: Reline. So I wonder if it will not work with more recent versions of Ruby that use Reline?