There are numerous tips in Ruby but I seem to keep forgetting them and having to search for them every time. So high time I started documenting them out.
This one I learnt from 10 Tips & Tricks from Drifting Ruby. I’m only going to keep to Ruby specific ones.
How come I didn’t know about this one?
Many times in
irb, we type in commands to see the result but then realize that we would like to store it in a variable. So, we end up rerunning the same command with the variable assignment before that.
The underscore method just sets the variable to the last executed command!
irb> 1 + 2 + 3 => 6 irb> sum = _ => 6 irb> sum => 6
Class and Instance methods
Many times I need to open a console with the
models loaded. To achieve this, in
irb we can load
bundler and the environment before loading the
To see the the class and instance methods against a Ruby class, we can pass
false as the first parameter to be able to see the methods directly.
irb> require 'bundler' irb> Bbundler.require irb> Dotenv.load irb> require_relative './models.rb' irb> User.methods(false) => [:logout] irb> User.instance_methods(false) => [:login]