Array of strings and hashes: flatten to make one dimensional

Question

If I have an array that looks like this:

['one', { 'two' => 'three' }, 'four']

How can I get it to:

['one', 'two, 'three', 'four']

Things like

.flatten

and

.flat_map

don't remove the inner hashes.

Answer 1

I think the closest solution you are going to get is something on the lines of:

['one', { 'two' => 'three' }, 'four'].
  flat_map {|f| f.respond_to?(:flatten) ? f.flatten : f }

I prefer the #respond_to? as it's generally better to check if it quacks like a duck, not if it is a duck.

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