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It's not actually ambiguous; though it is a bit of language-specific syntax to learn.

Agreed. It is the "idiomatic" way of writing code in Ruby. I love Java but writing lambda expressions in Java with deeply nested parenthesis makes the code really ugly and less readable esp with chaining.

As far as I understand, Ruby style is writing the code in the most elegant way to increase readability and (hopefully) reduce chances of bugs.

So what would you expect my example above do, at a glance?

Or is my example something that a good Ruby developer never write at all?

It's not ambiguous to the computer, but it is ambiguous to a human at a glance.

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