Ruby, Source Code of Splat?

2020-07-09 03:02发布

Someone asked about the splat operator yesterday, and I wanted to see the source code... would that be written in C or in Ruby? Where would it be found?

标签: ruby splat
2条回答
Viruses.
2楼-- · 2020-07-09 03:12

The splat operator is poorly documented in the core Ruby documentation as of Ruby 2.4. It's a core feature of the language, though, and the source code for the splat operator can be found in vm_eval.c under rb_yield_splat(VALUE values).

The unit test for rb_yield_splat makes it clearer what is happening:

it "yields with passed array's contents" do
  ret = nil
  @s.rb_yield_splat([1, 2]) { |x, y| ret = x + y }
  ret.should == 3
end
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▲ chillily
3楼-- · 2020-07-09 03:29

Some quick Google searching turned up that it's implemented in eval.c. You can find references to "splat" in a few places in the file, but I'm not familiar enough with the inner workings of Ruby to make any sense of it.

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