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Feature #8827

A method that flips the receiver and the first argument

Added by sawa (Tsuyoshi Sawada) almost 7 years ago. Updated almost 7 years ago.

Status:
Open
Priority:
Normal
Assignee:
-
Target version:
-
[ruby-core:56840]

Description

=begin
If it often happens that we need to pass to a method an argument that is the result of a long chain of operations:

Hash[some_chain_of_operations_that_ends_up_with_an_array]

File.read(some_chain_of_operations_that_ends_up_with_a_string)

YAML.dump(some_chain_of_operations_that_ends_up_with_an_object)

...

I believe one basic tenet of Ruby is to encourage method chaining, but that practice is discouraged in the examples above. It would be convenient if there is a method (let us call this Object#flip) that flips the receiver and the first argument and sends the method so that the examples above can be written as follows:

some_chain_of_operations_that_ends_up_with_an_array.flip(Hash, :[])

some_chain_of_operations_that_ends_up_with_a_string.flip(File, :read)

some_chain_of_operations_that_ends_up_with_an_object.flip(YAML, :dump)

...

The implementation in Ruby may be as follows:

class Object
  def flip receiver, method, *rest, &pr
    receiver.send(method, self, *rest, &pr)
  end
end

It would be good if we can have that as a built-in Ruby method.

=end

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