How do I use the fetch method for nested hash?

Question

I have the following hash:

hash = {\'name\' => { \'Mike\' => { \'age\' => 10, \'gender\' => \'m\' } } }

I can access the age by:

Answer 1

As of Ruby 2.3.0:

You can also use &. called the "safe navigation operator" as: hash&.[]('name')&.[]('Mike')&.[]('age'). This one is perfectly safe.

Using dig is not safe as hash.dig(:name, :Mike, :age) will fail if hash is nil.

However you may combine the two as: hash&.dig(:name, :Mike, :age).

So either of the following is safe to use:

hash&.[]('name')&.[]('Mike')&.[]('age')

hash&.dig(:name, :Mike, :age)