Use named parameters with block in Ruby

Question

I used to have this method:

def send_action(action, &success_block)

end

Which I could call like this:

send_action('PAIR') do
  pp 'test
end

Now I want to add an optional parameter:

def send_action(action, uuid = nil, &success_block)

end

But that doesn't seem to work (which I though). So I tried writing it with named parameters:

def send_action(action:, uuid: nil, &success_block)

end

But how can I combine named parameters with a block?

def send_action(action, uuid = nil, &success_block) Works For Me™. What error are you seeing? And what version of Ruby are you using? — Schwern
– Schwern, Commented Sep 18, 2019 at 16:29

Schwern · Accepted Answer · 2019-09-18 16:33:17Z

2

Both work with Ruby 2.4.4 and 2.6.4. Here's a demonstration with positional parameters.

def send_action(action, uuid = nil, &success_block)
  p "#{action} #{uuid}"
  success_block.call
end

send_action("foo") { p 99 }
"foo "
99

send_action("foo", "bar") { p 99 }
"foo bar"
99

And with named parameters.

def send_action(action:, uuid: nil, &success_block)
  p "#{action} #{uuid}"
  success_block.call
end

send_action(action: "foo") { p 99 }
"foo "
99

send_action(action: "foo", uuid: "bar") { p 99 }
"foo bar"
99

answered Sep 18, 2019 at 16:33

Schwern

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1 Comment

rept Over a year ago

You are correct, I had a missing comma. Both work fine, thanks for the example!

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