tips

Posted April 14, 2024  ‐  1 min read

Make all strings immutable by adding

Add # frozen_string_literal: true at the top of the file

Reference

Always get clean prompt for irb

Create an alias in your shell so that irb automatically invokes irb --sample-book-mode (This is also called --simple-prompt)

Decorator pattern in Ruby

module Decorator
    def square(x)
        puts "I am going to square #{x}"
        super
    end
end

class Foo
    def square(x)
        puts x**2
    end
end

# let's create an instance
foo = Foo.new

# let's decorate the 'square' method on the instance
foo.extend Decorator

# let's invoke the new decorated method
foo.square(5) #=> "I am going to square 5"
              #=> 25

Reference

__END__

If you put an __END__ in a Ruby file, everything after the __END__ will be accessible as a file in the DATA variable.

We used to do something similar in C 25 years ago. Combined code and data in a single file.
I don't remember specifics anymore, other than this fact.

From Ruby Weekly Newsletter dated 03 Feb 2022