Killing all Ruby Processes

I was running some commands that I later found out had left me with many orphaned ruby processes. Too many to kill one by one. I needed to just get rid of them all and quickly so killing all ruby processes was the best way to go.
Here is a short list of convenient and inconvenient ways to do that:

for each in `ps -eo pid,command | grep ruby | grep -v grep | awk '{print $1}' `; do kill -9 $each;done
killall −9 ruby
pkill -9 ruby
pidof ruby | xargs kill -9
ps aux | grep sidekiq | awk '{print $2}' | xargs kill

The easiest commands and best suggestions were brought to my attention by Alan Bailward and Gavin Mogan.