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When people say Elixir is just syntactic sugar on top of erlang I point them to Stream and Enum. It's a great example of how polymorphism via protocols is an enabler for powerful designs.

Interesting to see this as a novel thing in another ecosystem. Rust actually uses "stream" manipulation as a default way of dealing with things that might otherwise be expressed as full data structures. For example, the equivalent to one of the code snippets in the article would be:BufReader::new(File::open("myfile.txt").unwrap()).lines().enumerate().map(|(i, line)| format!("{}: {}", i, line.unwrap())).take(1).next().unwrap()(formatted for non-monospace font readability). Note the .unwrap() is where error handling should normally happen.

I wonder what the Erlang equivalent would look like (passing around data that are funs)?

When people say Elixir is just syntactic sugar on top of erlang I point them to Stream and Enum. It's a great example of how polymorphism via protocols is an enabler for powerful designs.

I wonder what the Erlang equivalent would look like (passing around data that are funs)?

Elixir Streams

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Elixir Streams

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