In this final installment on the #fetch method we look at #fetch beyond Hash; #fetch with nested hashes; re-using default blocks; and more.
A dive into some of the dark corners of the super keyword.
Sometimes one instance is all you need.
How to use Hash#fetch to provide defaults for missing keys, and why you might prefer that to other techniques for defaulting values.
How to reliably discover a user's home directory.
Some alternative ways to write symbols in Ruby code.
Hash#fetch is one of my favorite methods. In this episode, I take a look at using it to assert the existence of hash keys.
A look into how Ruby's object construction works, and how we can customize constructors for special scenarios.