Three things I didn't know Ruby does

Edit: I was misled!

Illustrated here. Hints below.

>> def inspect_x_and_y(x,y); puts "x: %p, y: %p" % [x, y]; end
=> nil
>> inspect_x_and_y(y={"hello" => "world"},x=[1,2,3])
x: {"hello"=>"world"}, y: [1, 2, 3]

The bits I didn’t know about:

1. "Format strings using a %% sign, %s, %s!" % [ "just like in python", "but with arrays" ]
2. The %p formatting character is the same as inspect.
3. You can call methods with method_name(param2=val2, param1=val1), also like in python. No you can’t! This code sets external variables called y and x.

How embarassing… :(