install ruby

C++
brew install rbenv ruby-build

# Add rbenv to bash so that it loads every time you open a terminal
echo 'if which rbenv > /dev/null; then eval "$(rbenv init -)"; fi' >> ~/.zshrc
source ~/.zshrc

# Install Ruby
rbenv install 2.6.6
rbenv global 2.6.6
ruby -vbrew install ruby$ sudo apt-get install ruby-full# The latest (stable) version is 2.7.1
Source

Also in C++: