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46 lines
1006 B
Markdown
46 lines
1006 B
Markdown
# Forward All Arguments To Another Method
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There are three types of arguments that a Ruby method can receive. Positional
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arguments, keyword arguments, and a block argument.
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A method that deals with all three might be defined like this:
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```ruby
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def forwarding_method(*args, **kwargs, &block)
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# implementation
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end
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```
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Now lets say we have some concrete method that we want to forward these
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arguments to:
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```ruby
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def concrete_method(*args, **kwargs)
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x = args.first || 1
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key, y = kwargs.first || [:a, 2]
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puts "Dealing with #{x} and key #{key}: #{y}"
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yield(x, y)
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end
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```
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We could forward arguments the longhand way like this:
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```ruby
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def forwarding_method(*args, **kwargs, &block)
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concrete_method(*args, **kwargs, &block)
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end
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```
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However, since Ruby 2.7 we have access to a shorthand "triple-dot" syntax for
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forwarding all arguments.
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```ruby
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def forwarding_method(...)
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concrete_method(...)
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end
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```
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[source](https://ruby-doc.org/3.3.6/syntax/methods_rdoc.html#label-Argument+Forwarding)
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