Discussion on: Today I learned about the splat operator in Ruby.

[Jeremy Friesen]

Welcome to the learning!

The * and ** are some of my favorite features; especially when you consider that if you have a hash with keys that are symbols you can prepend the ** and pass those as keyword args:

def my_method(hello:, gummy:)
  puts "Hello: #{hello}\nGummy: #{gummy}"
end

params = { hello: "world", gummy: "bears" }

my_method(**params)

Which gets super cool when you have the case where params has more keys/values (e.g. params = { hello: "world", gummy: "bears", ninja: "turtle" })

You can then do the following:

more_params = { hello: "world", gummy: "bears", ninja: "turtle" }

my_method(**more_params.slice(:hello, :gummy))

The above will only pass the :hello and :gummy values as named arguments.

The ** is a common pattern I use for dependency injection.

[Patrick Wendo]

This is definitely one of those operators you learn about and then suddenly realise how much easier it makes life.

[Jeremy Friesen]

Yes, and I'm excited to see where this learning takes you.